Zincostaurolite Mineral Data

Zincostaurolite Mineral Data

General Zincostaurolite Information

Chemical Formula:

[ ]4Zn4Al16(Al,[ ])2Si8O40[O6,(OH)2]

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

Empirical Formula:

Fe²⁺_0.13Mg_0.1Zn_2.45Li_0.51Fe²⁺_0.2Al_15.98Ti_0.02Al_1.95Mg_0.09Si₈O_44.3(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 Crystallography

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 - PrismaticH-M Symbol (2/m) Space Group: C 2/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 1.391(1)(462), 2.39(0.87)(132), 2.678(0.71)(151),1.9868(0.61)(062), 3.001(0.61)(221),

Crystal Structure:

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Chopin C , Goffe B , Ungaretti L , Oberti R , European Journal of Mineralogy , 15 (2003) p.167-176, Magnesiostaurolite and zincostaurolite: mineral description with a petrogenetic, and crystal-chemical update

Physical Properties of Zincostaurolite

Color:

Colorless.

Diaphaniety:

Transparent

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

7-7.5 - Quartz-Garnet

Luster:

Vitreous - Resinous

Streak:

white

Optical Properties of Zincostaurolite

Gladstone-Dale:

CI calc= -0.344 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2747,KC= 0.2044

Optical Data:

Biaxial (+), a=1.722, g=1.734, bire=0.0120

Calculated Properties of Zincostaurolite

Electron Density:

r_electron=2.60 gm/cc
note: r_{Zincostaurolite}=2.65 gm/cc.

Fermion Index

Fermion Index = 0.01119
Boson Index = 0.98881

Photoelectric:

PE_{Zincostaurolite}= 6.40 barns/electron
U=PE_{Zincostaurolite} x r_electron= 16.65 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Zincostaurolite is Not Radioactive

Zincostaurolite Classification

Dana Class:

52.2.3.3 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O

(52.2)with cations in [4] and >[4] coordination

(52.2.3)Dana Group

52.2.3.1 Staurolite (Fe,Mg)2Al9(Si,Al)4O20(O,OH)4 C 2/m 2/m

52.2.3.2 Magnesiostaurolite! []4Mg4Al16(Al,[])2Si8O40[O6,(OH)2] C 2/m 2/m

52.2.3.3 Zincostaurolite ! []4Zn4Al16(Al,[])2Si8O40[O6,(OH)2] C 2/m 2/m

Strunz Class:

VIII/B.03-05 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cations of octahedral and tetrahedral orientation [4/6]

VIII/B.03 - Staurolite - Gerstmannite series

VIII/B.03-03 Magnesiostaurolite! []4Mg4Al16(Al,[])2Si8O40[O6,(OH)2] C 2/m 2/m

VIII/B.03-05 Zincostaurolite []4Zn4Al16(Al,[])2Si8O40[O6,(OH)2] C 2/m 2/m

VIII/B.03-10 Staurolite (Fe,Mg)2Al9(Si,Al)4O20(O,OH)4 C 2/m 2/m

VIII/B.03-20 Gerstmannite (Mg,Mn)2ZnSiO4(OH)2 Bbam 2/m 2/m 2/m

Other Zincostaurolite Information

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 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Zincostaurolite

[ ]4Zn4Al16(Al,[ ])2Si8O40[O6,(OH)2]
Dana No: 52.2.3.3 Strunz No: VIII/B.03-05
Locality:

Notes: