Magnesiostaurolite
A valid IMA mineral species
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About Magnesiostaurolite
Formula:
Mg(Mg,Li)3(Al,Mg)18Si8O44(OH)4
Colour:
Colorless, light cloudy gray, tan
Lustre:
Vitreous, Sub-Vitreous
Hardness:
7 - 7½
Specific Gravity:
3.54 (Calculated)
Crystal System:
Monoclinic
Member of:
Name:
Named in 2003 by C. Chopin, B. Goffe, L. Ungaretti, and R. Oberti in allusion to its chemical composition with dominant magnesium, and its relationship to staurolite.
Type Locality:
Isostructural with:
This page provides mineralogical data about Magnesiostaurolite.
Unique Identifiers
Mindat ID:
2479
Long-form identifier:
mindat:1:1:2479:8
IMA Classification of Magnesiostaurolite
Approved
Approval year:
1992
First published:
2003
Classification of Magnesiostaurolite
9.AF.30
9 : SILICATES (Germanates)
A : Nesosilicates
F : Nesosilicates with additional anions; cations in [4], [5] and/or only [6] coordination
9 : SILICATES (Germanates)
A : Nesosilicates
F : Nesosilicates with additional anions; cations in [4], [5] and/or only [6] coordination
Dana 7th ed.:
52.2.3.2
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 |
|---|---|---|
| Mst | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Mst | 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 |
Physical Properties of Magnesiostaurolite
Vitreous, Sub-Vitreous
Transparency:
Transparent, Translucent
Colour:
Colorless, light cloudy gray, tan
Streak:
White
Hardness:
7 - 7½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
{010}
{010}
Fracture:
Irregular/Uneven
Density:
3.54 g/cm3 (Calculated)
Chemistry of Magnesiostaurolite
Mindat Formula:
Mg(Mg,Li)3(Al,Mg)18Si8O44(OH)4
Element Weights:
Crystallography of Magnesiostaurolite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 7.871 Å, b = 16.541 Å, c = 5.632 Å
Ratio:
a:b:c = 0.476 : 1 : 0.34
Unit Cell V:
733.3 ų
Z:
1
Morphology:
Stout blades, rarely elongated.
Twinning:
Sometimes tweed texture.
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0006961 | Magnesiostaurolite | Chopin C, Goffe B, Ungaretti L, Oberti R (2003) Magnesiostaurolite and zincostaurolite: mineral description with a petrogenetic and crystal-chemical update European Journal of Mineralogy 15 167-176 | 2003 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 1.968 Å | (100) |
| 1.391 Å | (82) |
| 2.390 Å | (50) |
| 2.678 Å | (38) |
| 2.370 Å | (33) |
| 4.139 Å | (24) |
| 2.356 Å | (24) |
Comments:
Calculated
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 5: Initiation of plate tectonics | <3.5-2.5 |
| 39 : High-? metamorphism (blueschist, eclogite, ultrahigh ? facies) |
Type Occurrence of Magnesiostaurolite
General Appearance of Type Material:
Rare anhedral isolated grains with size ranging from a few tens to 250 μm.
Place of Conservation of Type Material:
School of Mines, Paris, France, no. 56244.
Geological Setting of Type Material:
Occurs together with talc, clinochlore and kyanite (or alone, armouring corundum) as inclusions in pyrope megablasts from the ultra-high-pressure metamorphic terrane of the Dora-Maira massif, Italian Western Alps.
Associated Minerals at Type Locality:
Synonyms of Magnesiostaurolite
Other Language Names for Magnesiostaurolite
Relationship of Magnesiostaurolite to other Species
Member of:
Other Members of Staurolite Group:
| Staurolite | Fe2+2Al9Si4O23(OH) | Mon. 2/m : B2/m |
| Zincostaurolite | Zn2Al9Si4O23(OH) | Mon. 2/m : B2/m |
Common Associates
Associations Based on Photo Data:
| 5 photos of Magnesiostaurolite associated with Rutile | TiO2 |
| 3 photos of Magnesiostaurolite associated with Ellenbergerite | Mg6(Mg,Ti,Zr,◻)2(Al,Mg)6Si8O28(OH)10 |
| 3 photos of Magnesiostaurolite associated with Phosphoellenbergerite | (Mg,◻)2Mg12(PO4,PO3OH)6(PO3OH,CO3)2(OH)6 |
| 2 photos of Magnesiostaurolite associated with Pyrope | Mg3Al2(SiO4)3 |
| 2 photos of Magnesiostaurolite associated with Goethite | Fe3+O(OH) |
| 1 photo of Magnesiostaurolite associated with Kyanite | Al2(SiO4)O |
| 1 photo of Magnesiostaurolite associated with 'Phengite' | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| 1 photo of Magnesiostaurolite associated with Coesite | SiO2 |
Related Minerals - Strunz-mindat Grouping
| 9.AF. | Chegemite | Ca7(SiO4)3(OH)2 |
| 9.AF. | Jingwenite-(Y) | YAlV4+(SiO4)O2(OH)2 |
| 9.AF. | Barwoodite | Mn2+6Nb5+(SiO4)2O3(OH)3 |
| 9.AF.05 | Sillimanite | Al2(SiO4)O |
| 9.AF.05 | 'Xenolite' | Al10Si8O31 |
| 9.AF.10 | Kanonaite | Mn3+Al(SiO4)O |
| 9.AF.10 | Andalusite | Al2(SiO4)O |
| 9.AF.15 | Kyanite | Al2(SiO4)O |
| 9.AF.20 | Krieselite | Al2(GeO4)F2 |
| 9.AF.20 | Mullite | Al4+2xSi2-2xO10-x |
| 9.AF.23 | Boromullite | Al9BSi2O19 |
| 9.AF.25 | Yoderite | Mg(Al,Fe3+)3(SiO4)2O(OH) |
| 9.AF.30 | Zincostaurolite | Zn2Al9Si4O23(OH) |
| 9.AF.30 | Staurolite | Fe2+2Al9Si4O23(OH) |
| 9.AF.35 | Topaz | Al2(SiO4)(F,OH)2 |
| 9.AF.40 | Norbergite | Mg3(SiO4)F2 |
| 9.AF.45 | Chondrodite | Mg5(SiO4)2F2 |
| 9.AF.45 | Kumtyubeite | Ca5(SiO4)2F2 |
| 9.AF.45 | Reinhardbraunsite | Ca5(SiO4)2(OH,F)2 |
| 9.AF.45 | Hydroxylchondrodite | Mg5(SiO4)2(OH)2 |
| 9.AF.45 | Alleghanyite | Mn2+5(SiO4)2(OH)2 |
| 9.AF.50 | 'Unnamed (Ca-analogue of Humite)' | Ca7(SiO4)4F2 |
| 9.AF.50 | Humite | Mg7(SiO4)3F2 |
| 9.AF.50 | Manganhumite | Mn2+7(SiO4)3(OH)2 |
| 9.AF.50 | 'Unnamed (OH-analogue of humite)' | Mg7(SiO4)3(OH)2 |
| 9.AF.50 | Fluorchegemite | Ca7(SiO4)3F2 |
| 9.AF.55 | Hydroxylclinohumite | Mg9(SiO4)4(OH)2 |
| 9.AF.55 | Clinohumite | Mg9(SiO4)4F2 |
| 9.AF.55 | Sonolite | Mn2+9(SiO4)4(OH)2 |
| 9.AF.60 | Leucophoenicite | Mn2+7(SiO4)3(OH)2 |
| 9.AF.65 | Ribbeite | Mn2+5(SiO4)2(OH)2 |
| 9.AF.70 | Jerrygibbsite | Mn2+9(SiO4)4(OH)2 |
| 9.AF.75 | Franciscanite | Mn2+6(V5+,◻)2(SiO4)2(O,OH)6 |
| 9.AF.75 | Scorticoite | Mn6(Sb,◻)Σ2(SiO4)2O3(OH)3 |
| 9.AF.75 | Welinite | Mn2+6(W6+,Mg)2(SiO4)2(O,OH)6 |
| 9.AF.75 | Örebroite | Mn2+3(Sb5+,Fe3+)(SiO4)(O,OH)3 |
| 9.AF.80 | Ellenbergerite | Mg6(Mg,Ti,Zr,◻)2(Al,Mg)6Si8O28(OH)10 |
| 9.AF.85 | Magnesiochloritoid | MgAl2O(SiO4)(OH)2 |
| 9.AF.85 | Ottrélite | Mn2+Al2O(SiO4)(OH)2 |
| 9.AF.85 | Chloritoid | Fe2+Al2O(SiO4)(OH)2 |
| 9.AF.90 | Olmiite | CaMn2+[SiO3(OH)](OH) |
| 9.AF.90 | Poldervaartite | CaCa[SiO3(OH)](OH) |
| 9.AF.95 | Pilawite-(Y) | Ca2Y2Al4(SiO4)4O2(OH)2 |
Fluorescence of Magnesiostaurolite
Creamy-yellow in shortwave, somewhat dull orange in longwave 350 nm.
Other Information
Magnetism:
Non-Magnetic
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 Magnesiostaurolite
mindat.org URL:
https://www.mindat.org/min-2479.html
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References for Magnesiostaurolite
Reference List:
Enami, Masaki, Zang, Qijia (1988) Magnesian staurolite in garnet-corundum rocks and eclogite from the Donghai district, Jiangsu province, east China. American Mineralogist, 73 (1-2) 48-56
Peacock, S.M., Goodge, J.W. (1995) Eclogite-facies metamorphism preserved in tectonic blocks from a lower crustal shear zone, central Transantarctic Mountains, Antarctica. Lithos, 36 (1) 1-13 doi:10.1016/0024-4937(95)00006-2
Fockenberg, Thomas (1995) Synthesis and chemical variability of Mg-staurolite in the system MgO-Al2O3-SiO2-H2O as a function of water pressure. European Journal of Mineralogy, 7 (6) 1373-1380 doi:10.1127/ejm/7/6/1373
Fockenberg, Thomas (1998) An experimental investigation on the P-T stability of Mg-staurolite in the system MgO-Al2O3-SiO2-H2O. Contributions to Mineralogy and Petrology, 130 (2). 187-198 doi:10.1007/s004100050359
Chopin, Christian, Goffe, Bruno, Ungaretti, Luciano, Oberti, Roberta (2003) Magnesiostaurolite and zincostaurolite: mineral description with a petrogenetic and crystal-chemical update. European Journal of Mineralogy, 15 (1) 167-176 doi:10.1127/0935-1221/2003/0015-0167
TSUNOGAE, T, VANREENEN, D (2006) Corundum+quartz and Mg-staurolite bearing granulite from the Limpopo Belt, southern Africa: Implications for a P–T path. Lithos, 92 (3) 576-587 doi:10.1016/j.lithos.2006.03.052
Nishimiya, Yuki, Tsunogae, Toshiaki, Santosh, M. (2010) Sapphirine+quartz corona around magnesian (XMg ~0.58) staurolite from the Palghat-Cauvery Suture Zone, southern India: Evidence for high-pressure and ultrahigh-temperature metamorphism within the Gondwana suture. Lithos, 114 (3) 490-502 doi:10.1016/j.lithos.2009.10.012
Localities for Magnesiostaurolite
Showing 8 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.
China | |
| Zhang et al. (2004) |
Italy (TL) | |
| Terra Nova +2 other references |
| Piccoli et al. (2007) | |
| Piccoli et al. (2007) |
| Paolo Bozio data |
New Zealand | |
| Ward (1984) |
Norway | |
| Janák et al. (2015) |
Slovenia | |
| Janák et al. (2015) |
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Gilba Valley, Brossasco, Cuneo Province, Piedmont, Italy