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Zincostaurolite Mineral Data
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General Zincostaurolite Information
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 Chemical Formula: |
[ ]4Zn4Al16(Al,[ ])2Si8O40[O6,(OH)2] |
| Composition: |
Molecular Weight = 1,667.40 gm |
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Lithium 0.21 % Li 0.46 % Li2O |
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Magnesium 0.28 % Mg 0.46 % MgO |
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Titanium 0.06 % Ti 0.10 % TiO2 |
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Aluminum 29.01 % Al 54.82 % Al2O3 |
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Zinc 9.61 % Zn 11.96 % ZnO |
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Iron 1.11 % Fe 1.42 % FeO |
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Silicon 13.48 % Si 28.83 % SiO2 |
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Hydrogen 0.22 % H 1.98 % H2O |
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Oxygen 46.03 % O |
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______ ______ |
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100.00 % 100.02 % = TOTAL OXIDE |
| Empirical Formula: |
Fe2+0.13Mg0.1Zn2.45Li0.51Fe2+0.2Al15.98Ti0.02Al1.95Mg0.09Si8O44.3(OH)3.67 |
| Environment: |
Meta-bauxite in a karst-filled limestone (marbles). |
| IMA Status: |
Approved IMA 2003 (Dana #Added) |
| Locality: |
Zermatt Valley, Swiss Western Alps Link to MinDat.org Location Data. |
| Name Origin: |
Named as the Zinc-dominant analog of staurolite. |
| Synonym: |
IMA1992-036 |
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Zincostaurolite Image |
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Images:
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Zincostaurolite
Comments: BSE image of zincostaurolite (St) grain replaced by Na-Ca-Li mica (Mi), gahnite Gah), Fe-Mn hydroxide (small rounded bright grains) and diaspore (darkest grains in upper left corner). Matrix consists of calcite (Cal).
Location: Diaspore-bearing metabauxite from East Samos, Agean Sea, Greece. (AmMin v88:789).
Scale: See Image.
© American Mineralogist |
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Zincostaurolite Crystallography
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| Axial Ratios: |
a:b:c =0.4749:1:0.341 |
| Cell Dimensions: |
a = 7.853, b = 16.534, c = 5.639, Z = 0.7; beta = 90° V = 732.18 Den(Calc)= 2.65 |
| Crystal System: |
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m |
| X Ray Diffraction: |
By Intensity(I/Io): 1.391(1)(462), 2.39(0.87)(132), 2.678(0.71)(151),1.9868(0.61)(062), 3.001(0.61)(221), |
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Physical Properties of Zincostaurolite
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| Color: |
Colorless. |
| Diaphaneity: |
Transparent |
| Habit: |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). |
| Hardness: |
7-7.5 - Quartz-Garnet |
| Luster: |
Vitreous - Resinous |
| Streak: |
white |
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Optical Properties of Zincostaurolite
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| Gladstone-Dale: |
CI calc= -0.344 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2747,KC= 0.2044
Ncalc = 1.54 |
| Optical Data: |
Biaxial (+), a=1.722, g=1.734, bire=0.0120 |
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Calculated Properties of Zincostaurolite
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| Electron Density: |
Bulk Density (Electron Density)=2.60 gm/cc
note: Specific Gravity of Zincostaurolite =2.65 gm/cc.
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| Fermion Index: |
Fermion Index = 0.01
Boson Index = 0.99 |
| Photoelectric: |
PEZincostaurolite = 6.40 barns/electron
U=PEZincostaurolite x rElectron Density= 16.65 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Zincostaurolite is Not Radioactive |
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Zincostaurolite Classification
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| Dana Class: |
52.02.03.03 (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 Zincostaurolite Information
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| References: |
NAME( AmMin, v 88, p 1626) PHYS. PROP.(AmMin, v 88, p 1626) OPTIC PROP.(AmMin, v 88, p 1626) |
| See Also: |
Links to other databases for Zincostaurolite :
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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Zincostaurolite
[ ]4Zn4Al16(Al,[ ])2Si8O40[O6,(OH)2]
Dana No: 52.02.03.03 Strunz No: 09.AF.30
Locality:
Notes:
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