Ferroindialite
A valid IMA mineral species
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About Ferroindialite
Formula:
(Fe2+,Mg)2Al4Si5O18
Colour:
Brownish-violet to gray with violet-blue tint
Lustre:
Vitreous
Hardness:
7
Specific Gravity:
2.66
Crystal System:
Hexagonal
Member of:
Name:
For being the iron analogue of indialite.
Dimorph of:
The ferrous Fe (Fe2+)-dominant analogue of indialite; a high-temperature phase.
First reported in 1982 from Toyama prefecture, Japan.
First reported in 1982 from Toyama prefecture, Japan.
Unique Identifiers
Mindat ID:
43879
Long-form identifier:
mindat:1:1:43879:5
IMA Classification of Ferroindialite
Approved
IMA Formula:
Fe2+2Al3(Si5AlO18)
Approval year:
2013
First published:
2014
Classification of Ferroindialite
9.CJ.05
9 : SILICATES (Germanates)
C : Cyclosilicates
J : [Si6O18]12- 6-membered single rings (sechser-Einfachringe), without insular complex anions
9 : SILICATES (Germanates)
C : Cyclosilicates
J : [Si6O18]12- 6-membered single rings (sechser-Einfachringe), without insular complex anions
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Find | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Ferroindialite
Vitreous
Colour:
Brownish-violet to gray with violet-blue tint
Streak:
White
Hardness:
7 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
2.66(1) g/cm3 (Measured) 2.667 g/cm3 (Calculated)
Optical Data of Ferroindialite
Type:
Biaxial (-)
RI values:
nα = 1.539(2) nβ = 1.552(2) nγ = 1.554(2)
Max. Birefringence:
δ = 0.015
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:
Low (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.
No measured or calculated 2V is on file for this mineral, so the value used here (43°) is estimated from its recorded refractive indices and optic sign, not from a direct 2V measurement.
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.
No measured or calculated 2V is on file for this mineral, so the value used here (43°) is estimated from its recorded refractive indices and optic sign, not from a direct 2V measurement.
Dispersion:
Weak, r < v
Pleochroism:
Weak
Comments:
X = colorless, Z = pale violet.
Chemistry of Ferroindialite
Mindat Formula:
(Fe2+,Mg)2Al4Si5O18
Element Weights:
Crystallography of Ferroindialite
Crystal System:
Hexagonal
Class (H-M):
6/mmm(6/m2/m2/m) - Dihexagonal Dipyramidal
Space Group:
P6/mcc
Setting:
P6/mcc
Cell Parameters:
a = 9.8759(3) Å, c = 9.3102(3) Å
Ratio:
a:c = 1 : 0.943
Unit Cell V:
786.4 ų
Z:
2
Morphology:
Short prismatic or thick tabular hexagonal crystals.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 8.59 Å | (100) |
| 4.094 Å | (27) |
| 3.390 Å | (35) |
| 3.147 Å | (19) |
| 3.055 Å | (31) |
| 2.657 Å | (12) |
| 1.695 Å | (9) |
Comments:
From Type Description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 10b: Anthropogenic minerals | <10 Ka |
| 54 : Coal and other mine fire minerals (see also #51 and #56) |
Type Occurrence of Ferroindialite
General Appearance of Type Material:
Short prismatic or thick tabular hexagonal crystals up to 1.5 mm in size
Place of Conservation of Type Material:
Type material is deposited in the collections of the Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia, registration number 4400/1
Geological Setting of Type Material:
In a burnt xenolith of pelitic rock among alkaline basalts.
Associated Minerals at Type Locality:
Synonyms of Ferroindialite
Other Language Names for Ferroindialite
Dutch:Ferroindialiet
German:Ferroindialith
Relationship of Ferroindialite to other Species
Member of:
Other Members of Cordierite Group:
| Cordierite | Mg2Al4Si5O18 | Orth. mmm(2/m2/m2/m) : Cccm |
| Indialite | Mg2Al3(AlSi5O18) | Hex. 6/mmm(6/m2/m2/m) : P6/mcc |
| Sachanbińskiite | NaMn4(Al5Be)(AlSi5O18)2 · 2H2O | Orth. mmm(2/m2/m2/m) : Cccm |
| Sekaninaite | Fe2+2Al4Si5O18 | Orth. mmm(2/m2/m2/m) : Cccm |
Common Associates
Related Minerals - Strunz-mindat Grouping
| 9.CJ. | Zolotarevite | Na5Zr[Si6O15(OH)3] · 3H2O |
| 9.CJ. | 'Avdeevite' | NaAl4(Be5Li)(Si6O18)2(H2O)1-2 |
| 9.CJ. | 'Beryllocordierite-Na' | NaMg4(Al5Be)(AlSi5O18)2 · 2H2O |
| 9.CJ. | Sachanbińskiite | NaMn4(Al5Be)(AlSi5O18)2 · 2H2O |
| 9.CJ. | Nakkaalaaqite | K2[Na3Ca]LiCa2Ti2Be4Si12O38 |
| 9.CJ.05 | Johnkoivulaite-(Cs) | Cs[Be2B]Mg2Si6O18 |
| 9.CJ.05 | Beryl | Be3Al2(Si6O18) |
| 9.CJ.05 | Bazzite | Be3Sc2(Si6O18) |
| 9.CJ.05 va | 'Vorobyevite' | Be3Al2(Si6O18) |
| 9.CJ.05 | Stoppaniite | Be3Fe3+2(Si6O18) · H2O |
| 9.CJ.05 | Indialite | Mg2Al3(AlSi5O18) |
| 9.CJ.10 | Sekaninaite | Fe2+2Al4Si5O18 |
| 9.CJ.10 | Cordierite | Mg2Al4Si5O18 |
| 9.CJ.15a | Zirsinalite | Na6(Ca,Mn2+,Fe2+)Zr(Si6O18) |
| 9.CJ.15a | Kapustinite | Na6ZrSi6O16(OH)2 |
| 9.CJ.15a | Townendite | Na8ZrSi6O18 |
| 9.CJ.15a | Combeite | Na4.5Ca3.5Si6O17.5(OH)0.5 |
| 9.CJ.15a | Kazakovite | Na6Mn2+Ti(Si6O18) |
| 9.CJ.15a | Tisinalite | Na3H3(Mn,Ca,Fe)TiSi6(O,OH)18 · 2H2O |
| 9.CJ.15a | Lovozerite | Na2Ca(Zr,Ti)(Si6O12)[(OH)4O2] · H2O |
| 9.CJ.15a | Litvinskite | Na2(◻,Na,Mn)ZrSi6O12(OH,O)6 |
| 9.CJ.15c | Koashvite | Na6(Ca,Mn)(Ti,Fe)Si6O18 · H2O |
| 9.CJ.15b | Imandrite | Na12Ca3Fe3+2(Si6O18)2 |
| 9.CJ.25 | Baratovite | KCa7(Ti,Zr)2Li3Si12O36F2 |
| 9.CJ.25 | Aleksandrovite | KCa7Sn2Li3Si12O36F2 |
| 9.CJ.25 | Katayamalite | KLi3Ca7Ti2(SiO3)12(OH)2 |
| 9.CJ.30 | Dioptase | CuSiO3 · H2O |
| 9.CJ.35 | Kostylevite | K2Zr(Si3O9) · H2O |
| 9.CJ.40 | Petarasite | Na5Zr2(Si6O18)(Cl,OH) · 2H2O |
| 9.CJ.45 | Gerenite-(Y) | (Ca,Na)2(Y,REE)3Si6O18 · 2H2O |
| 9.CJ.50 | Odintsovite | K2Na4Ca3Ti2Be4Si12O38 |
| 9.CJ.55 | Mathewrogersite | Pb7FeAl3GeSi12O36(OH,H2O)6 |
| 9.CJ.60 | Pezzottaite-(Cs) | Cs(Be2Li)Al2(Si6O18) |
Other Information
Notes:
IR spectrum shows the absence of H2O or ОН groups
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Ferroindialite
mindat.org URL:
https://www.mindat.org/min-43879.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Ferroindialite
Reference List:
Kitamura, Masao, Hiroi, Yoshikuni (1982) Indialite from Unazuki Pelitic Schist, Japan, and its transition texture to cordierite. Contributions to Mineralogy and Petrology, 80 (2) 110-116 doi:10.1007/bf00374888
Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2013) New minerals and nomenclature modifications approved in 2013. CNMNC Newsletter No 16. Mineralogical Magazine, 77 (6) 2695-2709 doi:10.1180/minmag.2013.077.6.01
Haefeker, Udo, Kaindl, Reinhard, Tropper, Peter, Krüger, Hannes, Kahlenberg, Volker, Orlova, Maria (2014) Structural investigations of the two polymorphs of synthetic Fe-cordierite and Raman spectroscopy of hexagonal Fe-cordierite. Mineralogy and Petrology, 108 (4) 469-478 doi:10.1007/s00710-013-0313-3
Localities for Ferroindialite
Showing 9 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.
Czech Republic | |
| Joan Rosell - rosellminerals.com |
| Matýsek et al. (2022) |
Germany (TL) | |
| Chukanov et al. (2014) |
Japan | |
| Kitamura et al. (1982) |
Mongolia | |
| Savina et al. (2020) |
| Peretyazhko et al. (2017) |
| Peretyazhko et al. (2018) |
| Peretyazhko et al. (2018) | |
USA | |
| Gunnar Färber - Mineralienliste 3-2017. |
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Caspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany