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Zincostaurolite Mineral Data

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General Zincostaurolite Information

Help on Chemical  Formula: Chemical Formula: [ ]4Zn4Al16(Al,[ ])2Si8O40[O6,(OH)2]
Help on Composition: Composition: Molecular Weight = 1,667.40 gm
   Lithium     0.21 %  Li    0.46 % Li2O
   Magnesium   0.28 %  Mg    0.46 % MgO
   Titanium    0.06 %  Ti    0.10 % TiO2
   Aluminum   29.01 %  Al   54.82 % Al2O3
   Zinc        9.61 %  Zn   11.96 % ZnO
   Iron        1.11 %  Fe    1.42 % FeO
   Silicon    13.48 %  Si   28.83 % SiO2
   Hydrogen    0.22 %  H     1.98 % H2O
   Oxygen     46.03 %  O
             ______        ______ 
             100.00 %      100.02 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+0.13Mg0.1Zn2.45Li0.51Fe2+0.2Al15.98Ti0.02Al1.95Mg0.09Si8O44.3(OH)3.67
Help on Environment: Environment: Meta-bauxite in a karst-filled limestone (marbles).
Help on IMA Status: IMA Status: Approved IMA 2003 (Dana #Added)
Help on Locality: Locality: Zermatt Valley, Swiss Western Alps Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named as the Zinc-dominant analog of staurolite.
Help on Synonym: Synonym: IMA1992-036

Zincostaurolite Image

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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

Zincostaurolite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4749:1:0.341
Help on Cell Dimensions: Cell Dimensions: a = 7.853, b = 16.534, c = 5.639, Z = 0.7; beta = 90° V = 732.18 Den(Calc)= 2.65
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): 1.391(1)(462), 2.39(0.87)(132), 2.678(0.71)(151),1.9868(0.61)(062), 3.001(0.61)(221),

Physical Properties of Zincostaurolite

Help on Color: Color: Colorless.
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 7-7.5 - Quartz-Garnet
Help on Luster: Luster: Vitreous - Resinous
Help on Streak: Streak: white

Optical Properties of Zincostaurolite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.344 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2747,KC= 0.2044
Ncalc = 1.54
Help on Optical Data: Optical Data: Biaxial (+), a=1.722, g=1.734, bire=0.0120

Calculated Properties of Zincostaurolite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.60 gm/cc
note: Specific Gravity of Zincostaurolite =2.65 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEZincostaurolite = 6.40 barns/electron
U=PEZincostaurolite x rElectron Density= 16.65 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Zincostaurolite is Not Radioactive

Zincostaurolite 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 Zincostaurolite Information

Help on References: References: NAME( AmMin, v 88, p 1626) PHYS. PROP.(AmMin, v 88, p 1626) OPTIC PROP.(AmMin, v 88, p 1626)
Help on See Also: 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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Print or Cut-and-Paste your Zincostaurolite Specimen Label here :


[ ]4Zn4Al16(Al,[ ])2Si8O40[O6,(OH)2]
Dana No: Strunz No: 09.AF.30





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