Schaurteite Mineral Data

Schaurteite Mineral Data +

General Schaurteite Information

Chemical Formula:

Ca3Ge++++(SO4)2(OH)6·3(H2O)

Composition:

Molecular Weight = 541.06 gm

Calcium 22.22 % Ca 31.09 % CaO

Germanium 13.42 % Ge 19.33 % GeO₂

Hydrogen 2.24 % H 19.98 % H₂O

Sulfur 11.85 % S 29.60 % SO₃

Oxygen 50.27 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₃Ge(SO₄)₂(OH)₆·3(H₂O)

Environment:

Alteration product of Ge-bearing ores.

IMA Status:

Approved IMA 1965

Locality:

Tsumeb, Namibia. Link to MinDat.org Location Data.

Name Origin:

Named for Werner T. Schaurte (1892-1978), South African scientist.

Schaurteite Image

Images:

Schaurteite Tennantite

Comments: Bright white silky fibrous schaurteite on dark tennantite.
Location: Tsumeb, Oshikoto, Namibia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Schaurteite Crystallography

Axial Ratios:

a:c = 1:1.26721

Cell Dimensions:

a = 8.525, c = 10.803, Z = 2; V = 679.93 Den(Calc)= 2.64

Crystal System:

Hexagonal - Ditrigonal DipyramidalH-M Symbol (6 m2) Space Group: P 62c

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

By Intensity(I/I_o): 3.34(1), 4.26(0.7), 2.139(0.6),

Physical Properties of Schaurteite

Color:

Silky white.

Density:

2.65

Diaphaniety:

Transparent to Translucent

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

2.5 - Finger Nail

Luster:

Silky

Streak:

white

Optical Properties of Schaurteite

Gladstone-Dale:

CI meas= 0.004 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2178,KPDmeas= 0.217,KC= 0.2179

Optical Data:

Uniaxial (+), w=1.569, e=1.581, bire=0.0120.

Calculated Properties of Schaurteite

Electron Density:

r_electron=2.65 gm/cc
note: r_Schaurteite=2.64 gm/cc.

Fermion Index

Fermion Index = 0.0119
Boson Index = 0.9881

Photoelectric:

PE_Schaurteite= 11.23 barns/electron
U=PE_Schaurteite x r_electron= 29.81 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Schaurteite is Not Radioactive

Schaurteite Classification

Dana Class:

31.7.6.2 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.7)where (A+ B++)2 (XO4) Zq·x(H2O)

(31.7.6)Dana Group

31.7.6.1 Despujolsite Ca3Mn(SO4)2(OH)6·3(H2O) P 62c 6 m2

31.7.6.2 Schaurteite Ca3Ge(SO4)2(OH)6·3(H2O) P 62c 6 m2

31.7.6.3 Fleischerite Pb3Ge(SO4)2(OH)6·3(H2O) P 6₃/mmc 6/m 2/m 2/m

31.7.6.4 Mallestigite! Pb3Sb(SO4)(AsO4)(OH)6·3(H2O) P 6₃ 6 2 2

Strunz Class:

VI/D.11-20 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/D - Water-bearing sulfates with unfamiliar anions. cations of medium and very big size

VI/D.11 - Despujolsite - Fleischerite series

VI/D.11-10 Despujolsite Ca3Mn(SO4)2(OH)6·3(H2O) P 62c 6 m2

VI/D.11-20 Schaurteite Ca3Ge(SO4)2(OH)6·3(H2O) P 62c 6 m2

VI/D.11-30 Fleischerite Pb3Ge(SO4)2(OH)6·3(H2O) P 6₃/mmc 6/m 2/m 2/m

VI/D.11-40 Mallestigite! Pb3Sb(SO4)(AsO4)(OH)6·3(H2O) P 6₃ 6 2 2

Other Schaurteite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Schaurteite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Schaurteite

Ca3Ge++++(SO4)2(OH)6·3(H2O)
Dana No: 31.7.6.2 Strunz No: VI/D.11-20
Locality:

Notes: