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Magnesiostaurolite Mineral Data

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General Magnesiostaurolite Information

Help on Chemical  Formula: Chemical Formula: [ ]4Mg4Al16(Al,[ ])2Si8O40[O6,(OH)2]
Help on Composition: Composition: Molecular Weight = 1,562.60 gm
   Lithium     0.42 %  Li    0.90 % Li2O
   Magnesium   4.70 %  Mg    7.79 % MgO
   Titanium    0.12 %  Ti    0.20 % TiO2
   Aluminum   30.36 %  Al   57.36 % Al2O3
   Zinc        0.08 %  Zn    0.10 % ZnO
   Iron        0.57 %  Fe    0.74 % FeO
   Silicon    14.31 %  Si   30.61 % SiO2
   Hydrogen    0.26 %  H     2.29 % H2O
   Oxygen     49.19 %  O
             ______        ______ 
             100.00 %       99.99 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg0.72Fe2+0.16Mg1.85Li0.94Zn0.02Al15.96Ti0.04Al1.58Mg0.45Si7.96Al0.04O40.04(OH)3.98O4.02
Help on Environment: Environment: Anhedral inclusions up to 250 micro-m in pyrope megablasts. Ultra-high pressure mineral.
Help on IMA Status: IMA Status: Approved IMA 2003 (Dana #Added)
Help on Locality: Locality: Coesite-bearing Dora-Maira massif, Italian Western Alps. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named as the magnesium-dominant analog of staurolite.
Help on Synonym: Synonym: IMA1992-035

Magnesiostaurolite Image

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Comments: White crystals of magnesiostaurolite in rose quartz.
Location: Dora Maira Massif, Cuneo Province, Piedmont, Italy. Scale: Specimen Size 42 x 27 x 25 mm.
© Sergey Vasiliev / Systematic Mineralogy

Magnesiostaurolite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4758:1:0.3405
Help on Cell Dimensions: Cell Dimensions: a = 7.8706, b = 16.5411, c = 5.6323, Z = 1; beta = 90.007° V = 733.26 Den(Calc)= 3.54
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 1.968(1)(062), 1.39(0.82)(462), 2.39(0.5)(132),2.678(0.38)(151), 2.37(0.33)(330),

Physical Properties of Magnesiostaurolite

Help on Color: Color: Colorless.
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Inclusions - Generally found as inclusions in other minerals.
Help on Hardness: Hardness: 7-7.5 - Quartz-Garnet
Help on Luster: Luster: Vitreous - Resinous
Help on Streak: Streak: white

Optical Properties of Magnesiostaurolite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= 0.05 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2003,KC= 0.2109
Ncalc = 1.75
Help on Optical Data: Optical Data: Biaxial (?), b=1.709

Calculated Properties of Magnesiostaurolite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.50 gm/cc
note: Specific Gravity of Magnesiostaurolite =3.54 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEMagnesiostaurolite = 1.78 barns/electron
U=PEMagnesiostaurolite x rElectron Density= 6.22 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Magnesiostaurolite is Not Radioactive

Magnesiostaurolite Classification

Help on  Dana Class: Dana Class: (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O
  (52.02)with cations in [4] and >[4] coordination
  (52.02.03)Dana Group Staurolite (Fe,Mg)2Al9(Si,Al)4O20(O,OH)4 C 2/m 2/m Magnesiostaurolite! []4Mg4Al16(Al,[])2Si8O40[O6,(OH)2] C 2/m 2/m Zincostaurolite! []4Zn4Al16(Al,[])2Si8O40[O6,(OH)2] C 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.AF.30 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AF -Nesosilicates with additional anions;
09.AF.30 Staurolite (Fe,Mg)2Al9(Si,Al)4O20(O,OH)4 C 2/m 2/m
09.AF.30 Magnesiostaurolite! []4Mg4Al16(Al,[])2Si8O40[O6,(OH)2] C 2/m 2/m
09.AF.30 Zincostaurolite! []4Zn4Al16(Al,[])2Si8O40[O6,(OH)2] C 2/m 2/m

Other Magnesiostaurolite Information

Help on References: References: NAME( AmMin, 88,:1626) PHYS. PROP.(AmMin, 88,:1626) OPTIC PROP.(AmMin, 88,:1626)
Help on See Also: See Also: Links to other databases for Magnesiostaurolite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Print or Cut-and-Paste your Magnesiostaurolite Specimen Label here :


[ ]4Mg4Al16(Al,[ ])2Si8O40[O6,(OH)2]
Dana No: Strunz No: 09.AF.30





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