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Magnesiostaurolite

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Formula:
Mg(Mg,Li)3(Al,Mg)18Si8O44(OH)4
Colour:
Colourless
Lustre:
Vitreous
Hardness:
7 - 7½
Specific Gravity:
3.54 (Calculated)
Crystal System:
Monoclinic
Name:
Named in allusion to its composition, with its chemical composition with dominant magnesium, and its relationship to Staurolite.
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Classification of MagnesiostauroliteHide

Approved
Approval Year:
1992
9.AF.30

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

Physical Properties of MagnesiostauroliteHide

Vitreous
Transparency:
Transparent
Colour:
Colourless
Hardness:
7 - 7½ on Mohs scale
Density:
3.54 g/cm3 (Calculated)

Chemical Properties of MagnesiostauroliteHide

Formula:
Mg(Mg,Li)3(Al,Mg)18Si8O44(OH)4

Crystallography of MagnesiostauroliteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/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
Twinning:
Sometimes tweed texture.

Type Occurrence of MagnesiostauroliteHide

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.

Synonyms of MagnesiostauroliteHide

Other Language Names for MagnesiostauroliteHide

Relationship of Magnesiostaurolite to other SpeciesHide

Other Members of this group:
StauroliteFe2+2Al9Si4O23(OH)Mon. 2/m : B2/m
ZincostauroliteZn2Al9Si4O23(OH)Mon. 2/m : B2/m

Common AssociatesHide

Associated Minerals Based on Photo Data:
Ellenbergerite3 photos of Magnesiostaurolite associated with Ellenbergerite on mindat.org.
Rutile3 photos of Magnesiostaurolite associated with Rutile on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.AF.05SillimaniteAl2(SiO4)OOrth. mmm (2/m 2/m 2/m)
9.AF.10AndalusiteAl2(SiO4)OOrth. mmm (2/m 2/m 2/m) : Pnnm
9.AF.10KanonaiteMn3+Al(SiO4)OOrth. mmm (2/m 2/m 2/m) : Pnnm
9.AF.15KyaniteAl2(SiO4)OTric. 1 : P1
9.AF.20MulliteAl4+2xSi2-2xO10-xOrth. mmm (2/m 2/m 2/m) : Pbam
9.AF.20Krieselite(Al,Ga)2(GeO4)(OH)2Orth. mmm (2/m 2/m 2/m) : Pnma
9.AF.23BoromulliteAl9BSi2O19Orth. mm2 : Cmc21
9.AF.25YoderiteMg(Al,Fe3+)3(SiO4)2O(OH)Mon. 2/m : P21/m
9.AF.30StauroliteFe2+2Al9Si4O23(OH)Mon. 2/m : B2/m
9.AF.30ZincostauroliteZn2Al9Si4O23(OH)Mon. 2/m : B2/m
9.AF.35TopazAl2(SiO4)(F,OH)2Orth. mmm (2/m 2/m 2/m)
9.AF.40NorbergiteMg3(SiO4)(F,OH)2Orth. mmm (2/m 2/m 2/m)
9.AF.45AlleghanyiteMn2+5(SiO4)2(OH)2Mon. 2/m : P21/b
9.AF.45Chondrodite(Mg,Fe2+)5(SiO4)2(F,OH)2Mon. 2/m : P21/b
9.AF.45ReinhardbraunsiteCa5(SiO4)2(OH,F)2Mon. 2/m : P21/b
9.AF.45KumtyubeiteCa5(SiO4)2F2Mon. 2/m : P21/b
9.AF.45HydroxylchondroditeMg5(SiO4)2(OH)2Mon. 2/m : P21/b
9.AF.50Humite(Mg,Fe2+)7(SiO4)3(F,OH)2Orth. mmm (2/m 2/m 2/m)
9.AF.50Manganhumite(Mn2+,Mg)7(SiO4)3(OH)2Orth.
9.AF.50Unnamed (Ca-analogue of Humite)Ca7(SiO4)4F2Orth. mmm (2/m 2/m 2/m)
9.AF.55ClinohumiteMg9(SiO4)4F2Mon.
9.AF.55SonoliteMn2+9(SiO4)4(OH)2Mon.
9.AF.55HydroxylclinohumiteMg9(SiO4)4(OH)2Mon. 2/m
9.AF.60LeucophoeniciteMn2+7(SiO4)3(OH)2Mon. 2/m : P21/b
9.AF.65Ribbeite(Mn2+,Mg)5(SiO4)2(OH)2Orth.
9.AF.70JerrygibbsiteMn2+9(SiO4)4(OH)2Orth. mmm (2/m 2/m 2/m) : Pbcn
9.AF.75FranciscaniteMn2+6(V5+,☐)2(SiO4)2(O,OH)6Hex.
9.AF.75ÖrebroiteMn2+3(Sb5+,Fe3+)(SiO4)(O,OH)3Hex.
9.AF.75WeliniteMn2+6(W6+,Mg)2(SiO4)2(O,OH)6Trig. 3 : P3
9.AF.80EllenbergeriteMg6(Mg,Ti,Zr,◻)2(Al,Mg)6Si8O28(OH)10Hex.
9.AF.85Chloritoid(Fe2+,Mg,Mn2+)Al2(SiO4)O(OH)2Mon. 2/m : B2/b
9.AF.85MagnesiochloritoidMgAl2(SiO4)O(OH)2Mon. 2/m : B2/b
9.AF.85Ottrélite(Mn2+,Fe2+,Mg)Al2(SiO4)O(OH)2Mon.
9.AF.90PoldervaartiteCaCa[SiO3(OH)](OH)Orth. mmm (2/m 2/m 2/m) : Pbca
9.AF.90OlmiiteCaMn2+[SiO3(OH)](OH)Orth. mmm (2/m 2/m 2/m) : Pbca

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for MagnesiostauroliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Terra Nova, Abstract supplement 1, 9, 40.
Chopin, C., Goffé, B., Ungaretti, L., and Oberti, R. (2003) Magnesiostaurolite and zincostaurolite; mineral description with a petrogenetic and crystal-chemical update. European Journal of Mineralogy, 15, 167-176.

Internet Links for MagnesiostauroliteHide

Localities for MagnesiostauroliteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
China
 
  • Jiangsu Province
    • Lianyungang Prefecture
      • Donghai Co.
        • Zhimafang
Zhang, R.Y., Liou, J.G., and Zheng, J.P. (2004): Contributions to Mineralogy and Petrology 147, 21-31.
Italy
 
  • Piedmont
    • Cuneo Province
      • Po Valley
        • Martiniana Po
Piccoli, G.C., Maletto, G., Bosio, P., Lombardo, B. (2007). Minerali del Piemonte e della Valle d'Aosta. Associazione Amici del Museo "F. Eusebio" Alba, Ed., Alba (Cuneo) 607 pp.
      • Varaita Valley
        • Brossasco
Terra Nova, Abstract supplement 1, 9, 40; European Journal of Mineralogy (2003), 15, 167-176
Piccoli, G.C., Maletto, G., Bosio, P., Lombardo, B. (2007). Minerali del Piemonte e della Valle d'Aosta. Associazione Amici del Museo "F. Eusebio" Alba, Ed., Alba (Cuneo) 607 pp.
        • Venasca
          • Isasca valley
Paolo Bozio data
New Zealand
 
  • South Island
    • Southland
      • Fiordland
C. M. Ward (1984) Magnesium staurolite and green chromian staurolite from Fiordland, New Zealand . American Mineralogist, Volume 69, pages 531-540.
Norway
 
  • Troms
    • Tromsø
Janák, M., Uher, P., Ravna, E.K., Kullerud, K., Vrabec, M. (2015): Chromium-rich kyanite, magnesiostaurolite and corundum in ultrahigh-pressure eclogites (examples from Pohorje Mountains, Slovenia and Tromsø Nappe, Norway). European Journal of Mineralogy: 27(3): 377-392
Slovenia
 
Janák, M., Uher, P., Ravna, E.K., Kullerud, K., Vrabec, M. (2015): Chromium-rich kyanite, magnesiostaurolite and corundum in ultrahigh-pressure eclogites (examples from Pohorje Mountains, Slovenia and Tromsø Nappe, Norway). European Journal of Mineralogy: 27(3): 377-392
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