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Magnesiostaurolite Mineral Data
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General Magnesiostaurolite Information
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Chemical Formula: |
[ ]4Mg4Al16(Al,[ ])2Si8O40[O6,(OH)2] |
Composition: |
Molecular Weight = 1,562.60 gm |
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Lithium 0.42 % Li 0.90 % Li2O |
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Magnesium 4.70 % Mg 7.79 % MgO |
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Titanium 0.12 % Ti 0.20 % TiO2 |
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Aluminum 30.36 % Al 57.36 % Al2O3 |
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Zinc 0.08 % Zn 0.10 % ZnO |
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Iron 0.57 % Fe 0.74 % FeO |
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Silicon 14.31 % Si 30.61 % SiO2 |
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Hydrogen 0.26 % H 2.29 % H2O |
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Oxygen 49.19 % O |
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______ ______ |
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100.00 % 99.99 % = TOTAL OXIDE |
Empirical Formula: |
Mg0.72Fe2+0.16Mg1.85Li0.94Zn0.02Al15.96Ti0.04Al1.58Mg0.45Si7.96Al0.04O40.04(OH)3.98O4.02 |
Environment: |
Anhedral inclusions up to 250 micro-m in pyrope megablasts. Ultra-high pressure mineral. |
IMA Status: |
Approved IMA 2003 (Dana #Added) |
Locality: |
Coesite-bearing Dora-Maira massif, Italian Western Alps. Link to MinDat.org Location Data. |
Name Origin: |
Named as the magnesium-dominant analog of staurolite. |
Synonym: |
IMA1992-035 |
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Magnesiostaurolite Image |
Images:
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Magnesiostaurolite Crystallography
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Axial Ratios: |
a:b:c =0.4758:1:0.3405 |
Cell Dimensions: |
a = 7.8706, b = 16.5411, c = 5.6323, Z = 1; beta = 90.007° V = 733.26 Den(Calc)= 3.54 |
Crystal System: |
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m |
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), |
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Physical Properties of Magnesiostaurolite
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Color: |
Colorless. |
Diaphaneity: |
Transparent |
Habit: |
Inclusions - Generally found as inclusions in other minerals. |
Hardness: |
7-7.5 - Quartz-Garnet |
Luster: |
Vitreous - Resinous |
Streak: |
white |
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Optical Properties of Magnesiostaurolite
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Gladstone-Dale: |
CI calc= 0.05 (Good) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2003,KC= 0.2109 Ncalc = 1.75 |
Optical Data: |
Biaxial (?), b=1.709 |
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Calculated Properties of Magnesiostaurolite
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Electron Density: |
Bulk Density (Electron Density)=3.50 gm/cc note: Specific Gravity of Magnesiostaurolite =3.54 gm/cc. |
Fermion Index: |
Fermion Index = 0.01 Boson Index = 0.99 |
Photoelectric: |
PEMagnesiostaurolite = 1.78 barns/electron U=PEMagnesiostaurolite x rElectron Density= 6.22 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Magnesiostaurolite is Not Radioactive |
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Magnesiostaurolite Classification
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Dana Class: |
52.02.03.02 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O |
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(52.02)with cations in [4] and >[4] coordination |
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(52.02.03)Dana Group |
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52.02.03.01 Staurolite (Fe,Mg)2Al9(Si,Al)4O20(O,OH)4 C 2/m 2/m |
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52.02.03.02 Magnesiostaurolite! []4Mg4Al16(Al,[])2Si8O40[O6,(OH)2] C 2/m 2/m |
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52.02.03.03 Zincostaurolite! []4Zn4Al16(Al,[])2Si8O40[O6,(OH)2] C 2/m 2/m |
Strunz Class: |
09.AF.30 09 - SILICATES (Germanates) |
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09.A - Nesosilicates |
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09.AF -Nesosilicates with additional anions; |
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09.AF.30 Staurolite (Fe,Mg)2Al9(Si,Al)4O20(O,OH)4 C 2/m 2/m |
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09.AF.30 Magnesiostaurolite! []4Mg4Al16(Al,[])2Si8O40[O6,(OH)2] C 2/m 2/m |
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09.AF.30 Zincostaurolite! []4Zn4Al16(Al,[])2Si8O40[O6,(OH)2] C 2/m 2/m |
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Other Magnesiostaurolite Information
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References: |
NAME( AmMin, 88,:1626) PHYS. PROP.(AmMin, 88,:1626) OPTIC PROP.(AmMin, 88,:1626) |
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 :
Magnesiostaurolite
[ ]4Mg4Al16(Al,[ ])2Si8O40[O6,(OH)2]
Dana No: 52.02.03.02 Strunz No: 09.AF.30
Locality:
Notes:
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