Magnesio-riebeckite
A valid IMA mineral species - grandfathered
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About Magnesio-riebeckite
Formula:
◻Na2(Mg3Fe3+2)(Si8O22)(OH)2
Magnesio-riebeckite is defined as a member of the riebeckite group with Mg>Fe2+ in the C2+ position and (OH) in the W position.
Colour:
Light blue to blue-black.
Lustre:
Vitreous
Hardness:
5 - 5½
Crystal System:
Monoclinic
Member of:
Name:
Named in 1957 by Akiho Miashiro for its relationship to riebeckite and its magnesium content.
Forms a series with riebeckite and glaucophane.
Compare the chemically similar magnesio-arfvedsonite.
Compare the chemically similar magnesio-arfvedsonite.
Unique Identifiers
Mindat ID:
2518
Long-form identifier:
mindat:1:1:2518:4
Similar Names
IMA Classification of Magnesio-riebeckite
Approved, 'Grandfathered' (first described prior to 1959)
IMA status notes:
Redefined by the IMA
IMA Formula:
◻Na2(Mg3Fe3+2)Si8O22(OH)2
Approval history:
Redefined IMA 2012 s.p.
Classification of Magnesio-riebeckite
9.DE.25
9 : SILICATES (Germanates)
D : Inosilicates
E : Inosilicates with 2-periodic double chains, Si4O11; Clinoamphiboles
9 : SILICATES (Germanates)
D : Inosilicates
E : Inosilicates with 2-periodic double chains, Si4O11; Clinoamphiboles
14.24.1
14 : Silicates not Containing Aluminum
24 : Silicates of Fe, Mg and alkalis
14 : Silicates not Containing Aluminum
24 : Silicates of Fe, Mg and alkalis
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Mrbk | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Mrb | Kretz (1983) | Kretz, R. (1983) Symbols of rock-forming minerals. American Mineralogist, 68, 277–279. |
| Mg-Rbk | Siivolam & Schmid (2007) | Siivolam, J. and Schmid, R. (2007) Recommendations by the IUGS Subcommission on the Systematics of Metamorphic Rocks: List of mineral abbreviations. Web-version 01.02.07. IUGS Commission on the Systematics in Petrology. download |
| Mrbk | Whitney & Evans (2010) | Whitney, D.L. and Evans, B.W. (2010) Abbreviations for names of rock-forming minerals. American Mineralogist, 95, 185–187 doi:10.2138/am.2010.3371 |
| Mrb | The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
Physical Properties of Magnesio-riebeckite
Vitreous
Colour:
Light blue to blue-black.
Streak:
Pale grey to bluish-grey.
Hardness:
5 - 5½ on Mohs scale
Cleavage:
Perfect
on {110}
on {110}
Optical Data of Magnesio-riebeckite
Type:
Biaxial (-)
RI values:
nα = 1.668 nβ = 1.672 nγ = 1.68
2V:
Measured: 75° to 85°, Calculated: 72°
Max. Birefringence:
δ = 0.012
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
r > v or r < v
Chemistry of Magnesio-riebeckite
Mindat Formula:
◻Na2(Mg3Fe3+2)(Si8O22)(OH)2
Magnesio-riebeckite is defined as a member of the riebeckite group with Mg>Fe2+ in the C2+ position and (OH) in the W position.
Magnesio-riebeckite is defined as a member of the riebeckite group with Mg>Fe2+ in the C2+ position and (OH) in the W position.
Element Weights:
Common Impurities:
Ti,Al,Mn,Ca,K,H2O
Chemical Analysis
Oxide wt%:
| 1 | 2 | |
|---|---|---|
| SiO2 | 53.85 % | 56.34 % |
| TiO2 | 0.12 % | |
| Al2O3 | 0.80 % | 4.00 % |
| FeO2 | 23.42 % | |
| MnO | 0.10 % | 1.05 % |
| MgO | 9.49 % | 15.26 % |
| CaO | 1.40 % | 0.66 % |
| Na2O | 6.39 % | 7.89 % |
| K2O | 0.33 % | 0.30 % |
| Cl | 0.01 % | |
| F | 0.18 % | 0.38 % |
| FeO | 3.14 % | |
| O=F | 0.16 % | |
| Total: | 96.09 % | 89.18 % |
Empirical formulas:
| Sample ID | Empirical Formula |
|---|---|
| 2 | A(Na0.22K0.0,05)0.27 B( (Na1.90Ca0.10) 2.00 C( (Mg3.16Fe2+0.05Mn2+0.12Fe3+1.06Al0.61) 5.00 T( (Si7.96Al0.04) 8.00O22 W( (OH) 1.83 F0.17) 2.00 |
Sample references:
| ID | Locality | Reference | Notes |
|---|---|---|---|
| 1 | Mud Tank Vermiculite Mine, Alcoota Station, Central Desert Region, Northern Territory, Australia | Average of 6 analyses. Sample from an alkali-syenite. | |
| 2 | Iimori mine, Afuzu-mura, Iwade city, Wakayama Prefecture, Japan | BANNO, Yasuyuki, MOMMA, Koichi, MIYAWAKI, Ritsuro, YAMADA, Shigeo (2019) New data on ferri–ghoseite in Sanbagawa quartz schist from the Iimori region, Wakayama Prefecture, Japan: solid solution between magnesio–riebeckite and clino–suenoite. Journal of Mineralogical and Petrological Sciences, 114 (1) 33-40 doi:10.2465/jmps.181109 | Chemical analyses of the amphibole were performed on JEOL JXA–8800R and JEOL JXA–8900R electron microprobes at the GSJ Laboratory, AIST. Based on the relatively high oxygen fugacity indicated by the high Fe3+/(Fe2++Fe3+) ratios (0.99–1.0) of associated aegirine and garnet (Banno and Yamada, 2012), the Fe3+/Fe2+ ratios of the amphibole were estimated using the maximum ferric method of Leake et al. (1997). Total Mn was expressed as Mn2+, because, in this way, formulae calculated using the maximum ferric method satisfied the six criteria for calculation of amphibole formulae outlined by Leake et al. (1997). The amphibole is pale yellowish green and occurs as euhedral to subhedral crystals with lengths up to 500µm. |
Crystallography of Magnesio-riebeckite
Crystal System:
Monoclinic
Cell Parameters:
a = 9.745 Å, b = 17.912 Å, c = 5.278 Å
β = 103.82°
β = 103.82°
Ratio:
a:b:c = 0.544 : 1 : 0.295
Unit Cell V:
894.62 ų (Calculated from Unit Cell)
Z:
2
Comment:
Oberti et al. (2017) give a = 9.6481(14), b = 17.873(3), c = 5.3013(7) Å, β = 103.630(2)°, V = 888.4 (2) Å3.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits | |
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 35 : Ultra-alkali and agpaitic igneous rocks | |
| Stage 5: Initiation of plate tectonics | <3.5-2.5 |
| 40 : Regional metamorphism (greenschist, amphibolite, granulite facies) |
Type Occurrence of Magnesio-riebeckite
General Appearance of Type Material:
Dark blue, asbestiform fibers up to 1 meter long.
Geological Setting of Type Material:
Veins in slightly metamorphosed sandstone and carbonates associated with evaporites.
Synonyms of Magnesio-riebeckite
Other Language Names for Magnesio-riebeckite
Dutch:Magnesio-riebeckiet
Italian:Babudanite
Japanese:苦土リイベック閃石
Russian:Магнезиорибекит
Simplified Chinese:镁钠闪石
Relationship of Magnesio-riebeckite to other Species
Member of:
Other Members of Riebeckite Root Name Group:
| Fluoro-riebeckite | ◻Na2(Fe2+3Fe3+2)(Si8O22)F2 | Mon. 2/m : B2/m |
| Magnesio-fluoro-riebeckite | ◻Na2(Mg3Fe3+2)(Si8O22)F2 | Mon. 2/m : B2/m |
| Riebeckite | ◻Na2(Fe2+3Fe3+2)Si8O22(OH)2 | Mon. 2/m : B2/m |
Common Associates
Associations Based on Photo Data:
| 36 photos of Magnesio-riebeckite associated with 'Blue Quartz' | SiO2 |
| 22 photos of Magnesio-riebeckite associated with Quartz | SiO2 |
| 16 photos of Magnesio-riebeckite associated with Ohmilite | Sr3(Ti,Fe3+)(Si4O12)(O,OH) · 2-3H2O |
| 11 photos of Magnesio-riebeckite associated with Strontio-orthojoaquinite | (Na,Fe)2Sr2Ba2Ti2[Si4O12]2O2(O,OH)2 · H2O |
| 10 photos of Magnesio-riebeckite associated with Albite | Na(AlSi3O8) |
| 8 photos of Magnesio-riebeckite associated with Benitoite | BaTi(Si3O9) |
| 6 photos of Magnesio-riebeckite associated with 'Crocidolite' | ◻[Na2][Z2+3Fe3+2]Si8O22(OH,F,Cl)2 |
| 5 photos of Magnesio-riebeckite associated with Danburite | CaB2Si2O8 |
| 5 photos of Magnesio-riebeckite associated with Calcite | CaCO3 |
| 4 photos of Magnesio-riebeckite associated with 'Ferristilpnomelane' | K(Fe3+,Mg,Fe2+)8(Si,Al)12(O,OH)27 |
Related Minerals - Strunz-mindat Grouping
| 9.DE. | Shojiite | Na(NaMg)Mg5Si8O22(OH)2 |
| 9.DE. | Clino-suenoite | ◻Mn2+2(Mg5)(Si8O22)(OH)2 |
| 9.DE. | Mangani-eckermannite | NaNa2(Mg4Mn3+)Si8O22(OH)2 |
| 9.DE.05 | 'Permanganogrunerite' | ◻{Mn2+2}{Mn2+5}(Si8O22)(OH)2 |
| 9.DE.05 | Cummingtonite | ◻Mg2Mg5(Si8O22)(OH)2 |
| 9.DE.05 | Ferri-fluoro-leakeite | NaNa2(Mg2Fe3+2Li)(Si8O22)F2 |
| 9.DE.05 | Grunerite | ◻Fe2+2Fe2+5(Si8O22)(OH)2 |
| 9.DE.05 | Clino-holmquistite Root Name Group | ◻Li2(C2+3C3+2)(Si8O22)w2 |
| 9.DE.10 | Actinolite | ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2 |
| 9.DE.10 | Fluoro-cannilloite | CaCa2(Mg4Al)(Si5Al3)O22F2 |
| 9.DE.10 | Joesmithite | Pb2+Ca2(Mg3Fe3+2)(Si6Be2)O22(OH)2 |
| 9.DE.10 | Clino-ferro-suenoite | ◻Mn2+2(Fe2+5)(Si8O22)(OH)2 |
| 9.DE.10 | Fluoro-tremolite | ◻Ca2Mg5(Si8O22)F2 |
| 9.DE.10 | 'Parvo-manganotremolite' | ◻{CaMn2+}{Mg5}(Si8O22)(OH)2 |
| 9.DE.10 | Magnesio-ferri-hornblende | ◻Ca2(Mg4Fe3+)[(Si7Al)O22](OH)2 |
| 9.DE.10 | Ferro-ferri-hornblende | ◻Ca2(Fe2+4Fe3+)(AlSi7O22)(OH)2 |
| 9.DE.10 | 'Ferro-cannilloite' | CaCa2(Fe2+4Al)(Si5Al3O22)OH2 |
| 9.DE.10 | 'Ferro-ferri-cannilloite' | CaCa2(Fe2+4Fe3+)(Si5Al3O22)OH2 |
| 9.DE.10 | 'Ferro-fluoro-actinolite' | ◻{Ca2}{Fe5}(Si8O22)F2 |
| 9.DE.10 | 'Ferro-fluoro-hornblende' | ◻Ca2(Fe2+4Al)(AlSi7O22)F2 |
| 9.DE.10 | Magnesio-ferri-fluoro-hornblende | ◻Ca2(Mg4Fe3+)(AlSi7O22)F2 |
| 9.DE.10 | 'Ferro-ferri-fluoro-hornblende' | ◻Ca2(Fe2+4Fe3+)(AlSi7O22)F2 |
| 9.DE.10 | 'Ferri-fluoro-tschermakite' | ◻{Ca2}{Mg3Fe3+2}(Al2Si6O22)F2 |
| 9.DE.10 | 'Ferro-ferri-fluoro-tschermakite' | ◻{Ca2}{Fe2+3Fe3+2}(Al2Si6O22)F2 |
| 9.DE.10 | 'Ferro-fluoro-tschermakite' | ◻{Ca2}{Fe2+3Al2}(Al2Si6O22)F2 |
| 9.DE.10 | 'Fluoro-tschermakite' | ◻{Ca2}{Mg3Al2}(Al2Si6O22)F2 |
| 9.DE.10 | 'Magnesio-fluoro-hornblende' | ◻Ca2(Mg4Al)(AlSi7O22)F2 |
| 9.DE.10 | Tremolite | ◻Ca2Mg5(Si8O22)(OH)2 |
| 9.DE.10 | 'Ferro-ferri-tschermakite' | ◻{Ca2}{Fe2+3Fe3+2}(Al2Si6O22)(OH)2 |
| 9.DE.10 | 'Cannilloite' | CaCa2(Mg4Al)(Si5Al3O22)OH2 |
| 9.DE.10 | Tschermakite | ◻Ca2(Mg3Al2)(Al2Si6O22)(OH)2 |
| 9.DE.10 | Magnesio-hornblende | ◻Ca2(Mg4Al)(Si7Al)O22(OH)2 |
| 9.DE.10 | 'Ferri-tschermakite' | ◻Ca2(Mg3Fe3+2)(Al2Si6O22)(OH)2 |
| 9.DE.10 | Ferro-actinolite | ◻Ca2Fe2+5(Si8O22)(OH)2 |
| 9.DE.10 | Ferro-hornblende | ◻Ca2(Fe2+4Al)(Si7Al)O22(OH)2 |
| 9.DE.10 | Ferro-tschermakite | ◻Ca2(Fe2+3Al2)(Al2Si6O22)(OH)2 |
| 9.DE.15 | Potassic-chloro-pargasite | KCa2(Mg4Al)(Si6Al2)O22Cl2 |
| 9.DE.15 | 'Ferro-fluoro-pargasite' | (Na)(Ca2)(Fe2+4Al)(Al2Si6O22)F2 |
| 9.DE.15 | 'Potassic-ferro-chloro-edenite' | KCa2Fe2+5(AlSi7O22)Cl2 |
| 9.DE.15 | 'Ferro-ferri-sadanagaite' | NaCa2(Fe2+3Fe3+2)(Al3Si5O22)(OH)2 |
| 9.DE.15 | Hastingsite | NaCa2(Fe2+4Fe3+)(Si6Al2)O22(OH)2 |
| 9.DE.15 | Fluoro-edenite | NaCa2Mg5(Si7Al)O22F2 |
| 9.DE.15 | Pargasite | NaCa2(Mg4Al)(Si6Al2)O22(OH)2 |
| 9.DE.15 | Magnesio-fluoro-hastingsite | NaCa2(Mg4Fe3+)(Si6Al2)O22F2 |
| 9.DE.15 | Potassic-fluoro-hastingsite | KCa2(Fe2+4Fe3+)(Si6Al2)O22F2 |
| 9.DE.15 | Potassic-chloro-hastingsite | KCa2(Fe2+4Fe3+)(Si6Al2)O22Cl2 |
| 9.DE.15 | 'Unnamed (F-dominant analogue of Ferri-kaersutite)' | (Na,K)Ca2[Mg3(Fe3+,Fe2+)Ti](Si6Al2O22)(F,O)2 |
| 9.DE.15 | Edenite | NaCa2Mg5(Si7Al)O22(OH)2 |
| 9.DE.15 | Potassic-sadanagaite | KCa2(Mg3Al2)(Al3Si5O22)(OH)2 |
| 9.DE.15 | Ferri-kaersutite | NaCa2(Mg3Fe3+Ti)(Si6Al2O22)O2 |
| 9.DE.15 | Potassic-pargasite | KCa2(Mg4Al)(Si6Al2)O22(OH)2 |
| 9.DE.15 | Potassic-ferro-sadanagaite | KCa2(Fe2+3Al2)(Al3Si5O22)(OH)2 |
| 9.DE.15 | Kaersutite | NaCa2(Mg3AlTi4+)(Si6Al2)O22O2 |
| 9.DE.15 | 'Ferro-chloro-pargasite' | NaCa2(Fe2+4Al)(Al2Si6O22)Cl2 |
| 9.DE.15 | Potassic-fluoro-pargasite | KCa2(Mg4Al)(Si6Al2)O22F2 |
| 9.DE.15 | Potassic-ferro-ferri-sadanagaite | KCa2(Fe2+3Fe3+2)(Al3Si5O22)(OH)2 |
| 9.DE.15 | Fluoro-pargasite | NaCa2(Mg4Al)(Si6Al2)O22F2 |
| 9.DE.15 | 'Parvo-mangano-edenite' | {Na}{CaMn2+}{Mg5}(AlSi7O22)(OH)2 |
| 9.DE.15 | Ferro-fluoro-edenite | NaCa2Fe2+5(AlSi7O22)F2 |
| 9.DE.15 | Mangani-pargasite | NaCa2(Mg4Mn3+)(Si6Al2)O22(OH)2 |
| 9.DE.15 | Sadanagaite | NaCa2(Mg3Al2)(Si5Al3O22)(OH)2 |
| 9.DE.15 | Magnesio-hastingsite | NaCa2(Mg4Fe3+)(Si6Al2)O22(OH)2 |
| 9.DE.15 | 'Ferri-sadanagaite' | NaCa2(Mg3Fe3+2)(Al3Si5O22)(OH)2 |
| 9.DE.15 | 'Ferro-sadanagaite' | NaCa2(Fe3Al2)(Al3Si5O22)(OH)2 |
| 9.DE.15 | 'Ferri-fluoro-sadanagaite' | {Na}{Ca2}{Mg3Fe3+2}(Al3Si5O22)F2 |
| 9.DE.15 | 'Ferro-ferri-fluoro-sadanagaite' | {Na}{Ca2}{Fe2+3Fe3+2}(Al3Si5O22)F2 |
| 9.DE.15 | 'Ferro-fluoro-sadanagaite' | {Na}{Ca2}{Fe2+3Al2}(Al3Si5O22)F2 |
| 9.DE.15 | 'Fluoro-sadanagaite' | {Na}{Ca2}{Mg3Al2}(Al3Si5O22)F2 |
| 9.DE.15 | 'Potassic-chloro-sadanagaite' | KCa2(Mg3Al2)(Al3Si5O22)Cl2 |
| 9.DE.15 | 'Potassic-ferro-chloro-sadanagaite' | KCa2(Fe2+3Al2)(Al3Si5O22)Cl2 |
| 9.DE.15 | Ferro-edenite | NaCa2Fe2+5(Si7Al)O22(OH)2 |
| 9.DE.15 | Oxo-magnesio-hastingsite | NaCa2(Mg3(Fe3+2-x,Tix))5(Si6Al2O22)O2 |
| 9.DE.15 | Potassic-ferro-pargasite | KCa2(Fe2+4Al)(Si6Al2)O22(OH)2 |
| 9.DE.15 | Potassic-hastingsite | KCa2(Fe2+4Fe3+)(Al2Si6O22)(OH)2 |
| 9.DE.15 | 'Fluoro-hastingsite' | NaCa2(Fe2+4Fe3+)(Al2Si6O22)F2 |
| 9.DE.15 | Potassic-magnesio-hastingsite | KCa2(Mg4Fe3+)(Si6Al2)O22(OH)2 |
| 9.DE.15 | Vanadio-pargasite | NaCa2(Mg3+4V)(Al2Si6)O22(OH)2 |
| 9.DE.15 | 'Ferro-kaersutite' | NaCa2(Fe2+3AlTi)(Si6Al2O22)O2 |
| 9.DE.15 | Chromio-pargasite | NaCa2(Mg4Cr)(Si6Al2)O22(OH)2 |
| 9.DE.15 | Ferro-pargasite | NaCa2(Fe2+4Al)(Si6Al2)O22(OH)2 |
| 9.DE.20 | 'Ghoseite' | ◻[Mn2+Na][Mg4Al]Si8O22(OH)2 |
| 9.DE.20 | Potassic-ferro-taramite | K(CaNa)(Fe2+3Al2)(Si6Al2)O22(OH)2 |
| 9.DE.20 | Ferri-fluoro-katophorite | Na(CaNa)(Mg4Fe3+)(AlSi7O22)F2 |
| 9.DE.20 | Barroisite | ◻(CaNa)(Mg3Al2)(AlSi7O22)(OH)2 |
| 9.DE.20 | Fluoro-richterite | Na(CaNa)Mg5(Si8O22)F2 |
| 9.DE.20 | Potassic-ferro-ferri-taramite | K(CaNa)(Fe2+3Fe3+2)(Al2Si6O22)(OH)2 |
| 9.DE.20 | 'Potassic-ferri-katophorite' | K(CaNa)(Mg4Fe3+)(AlSi7O22)(OH)2 |
| 9.DE.20 | 'Potassic-ferro-richterite' | K(CaNa)Fe2+5(Si8O22)(OH)2 |
| 9.DE.20 | Potassic-fluoro-richterite | K(CaNa)Mg5(Si8O22)F2 |
| 9.DE.20 | Potassic-richterite | K(CaNa)Mg5(Si8O22)(OH)2 |
| 9.DE.20 | Ferri-ghoseite | ◻(Mn2+Na)(Mg4Fe3+)Si8O22(OH)2 |
| 9.DE.20 | Fluoro-taramite | Na(CaNa)(Mg3Al2)(Al2Si6O22)F2 |
| 9.DE.20 | 'Ferro-ferri-fluoro-katophorite' | Na(CaNa)(Fe2+4Fe3+)(AlSi7O22)F2 |
| 9.DE.20 | Richterite | Na(CaNa)Mg5(Si8O22)(OH)2 |
| 9.DE.20 | Ferri-winchite | ◻(NaCa)(Mg4Fe3+)Si8O22(OH)2 |
| 9.DE.20 | 'Fluoro-katophorite' | Na(CaNa)(Mg4Al)(AlSi7O22)F2 |
| 9.DE.20 | Hjalmarite | Na(NaMn)Mg5(Si8O22)(OH)2 |
| 9.DE.20 | Ferro-taramite | Na(CaNa)(Fe2+3Al2)(Al2Si6O22)(OH)2 |
| 9.DE.20 | 'Clinoferroholmquistite' | ◻Li2[Fe2+3Al2]Si8O22(OH,F)2 |
| 9.DE.20 | Ferro-katophorite | Na(CaNa)(Fe2+4Al)(AlSi7O22)(OH)2 |
| 9.DE.20 | Taramite | Na(CaNa)(Mg3Al2)(Al2Si6O22)(OH)2 |
| 9.DE.20 | 'Potassic-fluoro-katophorite' | K(CaNa)(Mg4Al)(AlSi7O22)F2 |
| 9.DE.20 | 'Ferro-fluoro-katophorite' | Na(CaNa)(Fe2+4Al)(AlSi7O22)F2 |
| 9.DE.20 | Ferri-katophorite | Na(CaNa)(Mg4Fe3+)(AlSi7O22)(OH)2 |
| 9.DE.20 | 'Ferro-ferri-barroisite' | ◻(CaNa)(Fe2+3Fe3+2)(AlSi7O22)(OH)2 |
| 9.DE.20 | Ferri-taramite | Na(CaNa)(Mg3Fe3+2)(Al2Si6O22)(OH)2 |
| 9.DE.20 | 'Potassic-ferro-ferri-katophorite' | K(CaNa)(Fe2+4Fe3+)(AlSi7O22)(OH)2 |
| 9.DE.20 | 'Ferro-ferri-winchite' | ◻(CaNa)(Fe2+4Fe3+)Si8O22(OH)2 |
| 9.DE.20 | Winchite | ◻(CaNa)(Mg4Al)(Si8O22)(OH)2 |
| 9.DE.20 | 'Ferro-fluoro-richterite' | {Na}{CaNa}{Fe2+5}(Si8O22)F2 |
| 9.DE.20 | 'Fluoro-winchite' | ◻(CaNa)(Mg4Al)(Si8O22)F2 |
| 9.DE.20 | 'Ferro-fluoro-winchite' | ◻{CaNa}{Fe2+4Al}(Si8O22)F2 |
| 9.DE.20 | 'Ferri-barroisite' | ◻(CaNa)(Mg3Fe3+2)(AlSi7O22)(OH)2 |
| 9.DE.20 | 'Ferro-ferri-taramite' | Na(CaNa)(Fe2+3Fe3+2)(Al2Si6O22)(OH)2 |
| 9.DE.20 | 'Ferri-fluoro-barroisite' | ◻{CaNa}{Mg3Fe3+2}(AlSi7O22)F2 |
| 9.DE.20 | 'Ferro-fluoro-barroisite' | ◻{CaNa}{Fe2+3Al2}(AlSi7O22)F2 |
| 9.DE.20 | 'Ferro-ferri-fluoro-barroisite' | ◻{CaNa}{Fe2+3Fe3+2}(AlSi7O22)F2 |
| 9.DE.20 | 'Fluoro-barroisite' | ◻{CaNa}{Mg3Al2}(AlSi7O22)F2 |
| 9.DE.20 | Ferro-ferri-katophorite | Na(NaCa)(Fe2+4Fe3+)(Si7Al)O22(OH)2 |
| 9.DE.20 | 'Ferri-fluoro-taramite' | Na(CaNa)(Mg3Fe3+2)(Al2Si6O22)F2 |
| 9.DE.20 | 'Ferro-ferri-fluoro-taramite' | Na(CaNa)(Fe2+3Fe3+2)(Al2Si6O22)F2 |
| 9.DE.20 | 'Ferro-fluoro-taramite' | Na(CaNa)(Fe2+3Al2)(Al2Si6O22)F2 |
| 9.DE.20 | 'Potassic-ferri-taramite' | K(CaNa)(Mg3Fe3+2)(Al2Si6O22)(OH)2 |
| 9.DE.20 | 'Magnesiotaramite' | {Na}{CaNa}{Mg3AlFe3+}(Al2Si6O22)(OH)2 |
| 9.DE.20 | 'Ferro-barroisite' | ◻(CaNa)(Fe2+3Al2)(AlSi7O22)(OH)2 |
| 9.DE.20 | Scandio-winchite | ◻(NaCa)(Mg4Sc)(Si8O22)(OH)2 |
| 9.DE.20 | Ferro-richterite | Na(CaNa)Fe2+5(Si8O22)(OH)2 |
| 9.DE.20 | Katophorite | Na(CaNa){Mg4Al)(AlSi7O22)(OH)2 |
| 9.DE.20 | 'Ferro-winchite' | ◻(CaNa)(Fe2+4Al)(Si8O22)(OH)2 |
| 9.DE.25 | 'Clino-sodic-fluoro-holmquistite' | {Na}{Li2}{Mg4Al}(Si8O22)F2 |
| 9.DE.25 | Ferro-ferri-nybøite | NaNa2(Fe2+3,Mg)Fe3+2)(AlSi7O22)(OH)2 |
| 9.DE.25 | Clino-ferro-ferri-holmquistite | ◻Li2(Fe2+3Fe3+2)(Si8O22)(OH)2 |
| 9.DE.25 | 'Oxo-pargasite' | NaCa2(Mg3(Al2-xTix))5(Si6Al2O22)O2 |
| 9.DE.25 | 'Ferri-nybøite' | NaNa2(Mg3Fe3+2)(AlSi7O22)(OH)2 |
| 9.DE.25 | 'Ferro-ferri-leakeite' | NaNa2(Fe2+2Fe3+2Li)Si8O22(OH)2 |
| 9.DE.25 | Ferro-ferri-fluoro-leakeite | NaNa2(Fe2+2Fe3+2Li)(Si8O22)F2 |
| 9.DE.25 | Ferri-leakeite | NaNa2(Mg2Fe3+2Li)Si8O22(OH)2 |
| 9.DE.25 | Fluoro-pedrizite | NaLi2(Mg2Al2Li)(Si8O22)F2 |
| 9.DE.25 | Eckermannite | NaNa2(Mg4Al}Si8O22(OH)2 |
| 9.DE.25 | Arfvedsonite | NaNa2(Fe2+4Fe3+)Si8O22(OH)2 |
| 9.DE.25 | 'Mangano-ferri-fluoro-leakeite' | NaNa2(Mn2+2Fe3+2Li)(Si8O22)F2 |
| 9.DE.25 | Ferri-obertiite | NaNa2(Mg3Fe3+Ti)Si8O22O2 |
| 9.DE.25 | Riebeckite | ◻Na2(Fe2+3Fe3+2)Si8O22(OH)2 |
| 9.DE.25 | 'Unnamed (Possible K-analogue of Ferri-obertiite)' | KNa2((Mg,Fe,Na)3Fe3+(Ti,Fe))Si8O22(O,F)2 |
| 9.DE.25 | Magnesio-fluoro-arfvedsonite | NaNa2(Mg4Fe3+)[Si8O22]F2 |
| 9.DE.25 | 'Ferro-fluoro-glaucophane' | ◻[Na2][Fe2+3Al2]Si8O22F2 |
| 9.DE.25 | Oxo-mangani-leakeite | NaNa2(Mn3+4Li)Si8O22O2 |
| 9.DE.25 | Fluoro-leakeite | NaNa2(Mg2Al2Li)(Si8O22)F2 |
| 9.DE.25 | Nybøite | NaNa2(Mg3Al2)(AlSi7O22)(OH)2 |
| 9.DE.25 | 'Sodic-ferri-clinoferroholmquistite' | Na0.5{Li2}{Fe2+3Fe3+2}(Si8O22)(OH)2 |
| 9.DE.25 | Potassic-arfvedsonite | KNa2(Fe2+4Fe3+)(Si8O22)(OH)2 |
| 9.DE.25 | 'Potassic-mangano-mangani-ungarettiite' | KNa2(Mn2+2Mn3+3)Si8O22O2 |
| 9.DE.25 | Potassic-jeanlouisite | K(NaCa)(Mg4Ti)Si8O22O2 |
| 9.DE.25 | Ferri-pedrizite | NaLi2(Mg2Fe3+2Li)Si8O22(OH)2 |
| 9.DE.25 | Glaucophane | ◻Na2(Mg3Al2)Si8O22(OH)2 |
| 9.DE.25 | Ferro-fluoro-pedrizite | NaLi2(Fe2+2Al2Li)[Si8O22]F2 |
| 9.DE.25 | Potassic-ferri-leakeite | KNa2(Mg2Fe3+2Li)(Si8O22)(OH)2 |
| 9.DE.25 | Potassic-magnesio-fluoro-arfvedsonite | KNa2(Mg4Fe3+)(Si8O22)F2 |
| 9.DE.25 | Mangani-obertiite | NaNa2(Mg3Mn3+Ti4+)Si8O22O2 |
| 9.DE.25 | Scandio-fluoro-eckermannite | NaNa2(Mg4Sc)(Si8O22)F2 |
| 9.DE.25 | 'Ferro-eckermannite' | NaNa2(Fe2+4Al)Si8O22(OH)2 |
| 9.DE.25 | Ferro-ferri-pedrizite | NaLi2(Fe2+2Fe3+2Li)Si8O22(OH)2 |
| 9.DE.25 | 'Pedrizite' | NaLi2(LiMg2Al2)(Si8O22)(OH)2 |
| 9.DE.25 | Ferro-pedrizite | NaLi2(Fe2+2Al2Li)Si8O22(OH)2 |
| 9.DE.25 | Potassic-mangani-leakeite | KNa2(Mg2Mn3+2Li)(Si8O22)(OH)2 |
| 9.DE.25 | 'Clino-fluoro-holmquistite' | ◻{Li2}{Mg3Al2}(Si8O22)F2 |
| 9.DE.25 | Ferro-ferri-obertiite | NaNa2(Fe2+3Fe3+Ti)Si8O22O2 |
| 9.DE.25 | Potassic-magnesio-arfvedsonite | KNa2(Mg4Fe3+)(Si8O22)(OH)2 |
| 9.DE.25 | Fluoro-nybøite | NaNa2(Mg3Al2)(AlSi7O22)(F,OH)2 |
| 9.DE.25 | Mangano-ferri-eckermannite | NaNa2(Mn2+4Fe3+)Si8O22(OH)2 |
| 9.DE.25 | 'Fluoro-glaucophane' | ◻[Na2][Mg3Al2]Si8O22F2 |
| 9.DE.25 | Fluoro-riebeckite | ◻Na2(Fe2+3Fe3+2)(Si8O22)F2 |
| 9.DE.25 | Magnesio-fluoro-riebeckite | ◻Na2(Mg3Fe3+2)(Si8O22)F2 |
| 9.DE.25 | 'Fluoro-eckermannite' | NaNa2(Mg4Al}Si8O22F2 |
| 9.DE.25 | 'Ferro-fluoro-eckermannite' | NaNa2(Fe2+4Al}Si8O22F2 |
| 9.DE.25 | 'Fluoro-arfvedsonite' | NaNa2(Fe2+4Fe3+)Si8O22F2 |
| 9.DE.25 | Magnesio-arfvedsonite | NaNa2(Mg4Fe3+)(Si8O22)(OH)2 |
| 9.DE.25 | 'Ferri-fluoro-nybøite' | NaNa2(Mg3Fe3+2)(AlSi7O22)F2 |
| 9.DE.25 | 'Ferro-ferri-fluoro-nybøite' | NaNa2(Fe2+3Fe3+2)(AlSi7O22)F2 |
| 9.DE.25 | Ferro-glaucophane | ◻Na2(Fe2+3Al2)Si8O22(OH)2 |
| 9.DE.25 | 'Ferro-fluoro-nybøite' | NaNa2(Fe2+3Al2)(AlSi7O22)F2 |
| 9.DE.25 | Mangani-dellaventuraite | NaNa2(MgMn3+2Ti4+Li)Si8O22O2 |
| 9.DE.25 | 'Ferro-leakeite' | NaNa2(Fe2+2Al2Li)(Si8O22)(OH)2 |
| 9.DE.25 | 'Leakeite' | NaNa2(Mg2Al2Li)(Si8O22)(OH)2 |
| 9.DE.25 | 'Potassic-leakeite' | KNa2(Mg2Al2Li)(Si8O22)(OH)2 |
| 9.DE.25 | 'Ferri-fluoro-pedrizite' | NaLi2(LiMg2Fe3+2)(Si8O22)F2 |
| 9.DE.25 | 'Ferro-ferri-fluoro-pedrizite' | NaLi2(LiFe2+2Fe3+2)(Si8O22)F2 |
| 9.DE.25 | 'Ferro-nybøite' | NaNa2(Fe2+3Al2)(AlSi7O22)(OH)2 |
| 9.DE.25 | 'Clino-ferro-ferri-fluoro-holmquistite' | ◻{Li2}{Fe2+3Fe3+2}(Si8O22)F2 |
| 9.DE.25 | Mangano-mangani-ungarettiite | NaNa2(Mn2+2Mn3+3)(Si8O22)O2 |
| 9.DE.25 | 'Clino-ferri-fluoro-holmquistite' | ◻{Li2}{Mg3Fe3+2}(Si8O22)F2 |
| 9.DE.25 | 'Clino-ferro-fluoro-holmquistite' | ◻{Li2}{Fe2+3Al2}(Si8O22)F2 |
Other Information
Health Risks:
The asbestiform variety of magnesioriebeckite can cause lung disease when inhaled, as in other species of asbestos minerals.
Magnesio-riebeckite in petrology
An essential component of rock names highlighted in red, an accessory component in rock names highlighted in green.
Internet Links for Magnesio-riebeckite
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https://www.mindat.org/min-2518.html
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References for Magnesio-riebeckite
Reference List:
Whittaker, E. J. W. (1949) The structure of Bolivian crocidolite. Acta Crystallographica, 2 (5) 312-317 doi:10.1107/s0365110x49000801
Ernst, W. G. (1963) Polymorphism in alkali amphiboles. American Mineralogist, 48 (3-4) 241-260 (synthetic material)
Burns, Roger G., Prentice, F. J. (1968) Distribution of iron cations in the crocidolite structure. American Mineralogist, 53 (5-6) 770-776
Addison, W. E., White, A. D. (1968) The oxidation of Bolivian crocidolite. Mineralogical Magazine and Journal of the Mineralogical Society, 36 (282) 791-796 doi:10.1180/minmag.1968.036.282.05
Muir Wood, Robert (1980) Compositional zoning in sodic amphiboles from the blueschist facies. Mineralogical Magazine, 43 (330) 741-752 doi:10.1180/minmag.1980.043.330.07
Hoffmann, Chr., Katz, K. (1982) Trend surface analysis of some physical properties of alkali (sodic) amphiboles. Lithos, 15 (1) 17-25 doi:10.1016/s0024-4937(82)80002-9
Mian, I., Le Bas, M. J. (1986) Sodic amphiboles in fenites from the Loe Shilman carbonatite complex, NW Pakistan. Mineralogical Magazine, 50 (356) 187-197 doi:10.1180/minmag.1986.050.356.01 (solid solution with magnesio-arfvedsonite)
Hawthorne, F. C., Oberti, R. (2006) On the classification of amphiboles. The Canadian Mineralogist, 44 (1) 1-21 doi:10.2113/gscanmin.44.1.1
Hawthorne, F. C., Oberti, R., Zanetti, A., Nayak, V.K. (2008) The crystal chemistry of alkali amphiboles from the Kajlidongri Manganese Mine, India. The Canadian Mineralogist, 46 (2) 455-466 doi:10.3749/canmin.46.2.455
Localities for Magnesio-riebeckite
Showing 134 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Atlantic Ocean | |
| Carman et al. (South Atlantic) +1 other reference |
Australia | |
| Currie et al. (1992) |
| Andy Wilde et al. (2013) |
| Lottermoser (1987) +2 other references |
| Bottrill & Taheri +1 other reference |
| Downes et al. (2014) |
| Dunkan et al. (1990) +4 other references |
Austria | |
| Koller (1978) |
| Strasser (1989) |
| Strasser (1989) |
| Hasenberger et al. (1998) +2 other references |
| Strasser (1989) | |
| Bernroider et al. (2017) +4 other references |
| Kolitsch et al. (2015) +1 other reference |
| Exel (1993) |
| Kolitsch (2026) |
| Kolitsch (2026) |
| Kolitsch (2026) +1 other reference |
Belarus | |
| E.P. Shpanov et al. (1989) +1 other reference |
Bolivia (TL) | |
| Whittaker (1949) |
| GEOBOL-PNUD et al. (as "crocidolite") |
| GEOBOL-PNUD | |
| GEOBOL-PNUD et al. (as "crocidolite") |
| GEOBOL-PNUD et al. (as "crocidolite") | |
| GEOBOL-PNUD et al. (as "crocidolite") |
| Petrov (n.d.) | |
| Petrov (n.d.) | |
| GEOBOL-PNUD et al. (as "crocidolite") |
| Petrov (n.d.) |
| Federico Ahlfeld and Jorge Muñoz Reyes (1955) | |
| GEOBOL-PNUD et al. (as "crocidolite") | |
| GEOBOL-PNUD et al. (as "crocidolite") | |
| GEOBOL-PNUD et al. (as "crocidolite") | |
| GEOBOL-PNUD et al. (as "crocidolite") |
| GEOBOL-PNUD et al. (as "crocidolite") | |
| GEOBOL-PNUD et al. (as "crocidolite") |
| GEOBOL-PNUD et al. (as "crocidolite") | |
| Petrov (n.d.) +1 other reference |
| Federico Ahlfeld and Jorge Muñoz Reyes (1955) | |
Bulgaria | |
| Dyulgerov +2 other references |
Canada | |
| Dalsin (2013) +1 other reference |
| Ghent et al. (1990) |
| Klein (1966) |
| Klein (1966) |
| May 1984 +4 other references |
China | |
| Smith (2006) +2 other references |
| Kuifeng Yang et al. (2007) +1 other reference | |
| Xue et al. (2026) | |
| Yang et al. (2003) |
| Yiming Zhao and Daxin Li (2003) |
| Denghong Wang et al. (2000) |
| Kapp et al. (2000) |
| Ding et al. (2003) +1 other reference |
| Tang (2005) |
Greece | |
| Schreiber et al. (2007) |
| Xypolias et al. (2012) |
India | |
| Pichamuthu (1950) |
| Hawthorne et al. (2008) |
| NIYOGI (1966) |
| Doroshkevich et al. (2009) |
| Kaur et al. (2017) |
| Talukdar et al. (2018) | |
Iran | |
| Gansser (1992) |
Italy | |
| Barresi et al. (2005) +1 other reference |
| Laurita et al. (2019) +1 other reference |
| Bedognè et al. (1993) +1 other reference |
| Piccoli et al. (2007) |
| Cámara et al. (2014) +1 other reference |
| Piccoli et al. (2007) |
| Piccoli et al. (2007) | |
| M.E. Ciriotti +1 other reference |
| Azzaro E. et al. (1977) |
| Azzaro E. et al. (1977) | |
| Azzaro E. et al. (1977) | |
Japan | |
| Yamada (2004) |
| Hiroaki Tano specimen | |
| Tomioka et al. (2025) |
| Miyashiro et al. (1957) |
| Petrology exhibit at Stone Fair |
| BANNO et al. (2019) |
Kazakhstan | |
| Box |
Madagascar | |
| Royal Museum for Central Africa |
| Behier (1963) +1 other reference |
| Andriamampihantona (1992) |
Myanmar | |
| Jing Wang et al. (2013) |
Namibia | |
| von Bezing (2007) |
New Zealand | |
| Cooper (1996) |
| Cooper (1996) |
North Macedonia | |
| Jančev et al. (2017) |
| Chukanov et al. (2015) | |
| Cunico Resources |
Pakistan | |
| Mian et al. (1986) |
| Dr. Wing Tak Lui collection |
Portugal | |
| Ribeiro (1987) |
Romania | |
| Pál Molnár (2000) |
| Szakáll et al. (2010) |
| Hârtopanu et al. (1996) +1 other reference |
| minerals-of-the-carpathians.eu (2008) |
Russia | |
| webmineral.ru (2016) |
| Pavel M. Kartashov (n.d.) |
| Pavel M. Kartashov analytical data 2020 |
| ... |
| Konopleva et al. (2008) | |
| Steffen Möckel Collection |
Spain | |
| - (alleged by some collectors to colour the quartz blue, but might be mistaken ID) +2 other references |
| Adrian Pesudo Collection |
Sweden | |
| www.handbookofmineralogy.org (2008) |
Switzerland | |
| Philipp. R. (1982) +1 other reference |
| Philipp. R. (1982) |
| Stalder et al. (1998) |
| Philipp. R. (1982) +1 other reference |
| Philipp. R. (1982) +1 other reference | |
| Gianluca Armellino et al. (2025) |
| Brugger J. (1996) +1 other reference | |
| Stalder et al. (1998) |
UK | |
| DEANS et al. (1971) +1 other reference |
Ukraine | |
| Roberto Bosi collection. | |
USA | |
| Onucki et al. (1969) +1 other reference |
| Peter Cristofono |
| Eckel et al. (1997) |
| Tank (1972) | |
| Heinrich et al. (2004) |
| McSwiggen et al. (1994) |
| Lowers +1 other reference |
| Maertens (2007) |
| Dunn (1995) |
| FOMS Millsite Committee (1986) | |
| Itsuki Imaeda Collection | |
| Dunn (1995) | |
| SEM/EDS analysis by Excalibur Mineral ... |
| Bullock (1981) |
| Milton et al. (1960) | |
| Pabst (1973) | |
| James Cheshire collection |
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Alto Chapare mining district, Chapare Province, Cochabamba, Bolivia