Stranskiite Mineral Data

Stranskiite Mineral Data +

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General Stranskiite Information

Chemical Formula:

Zn2Cu++(AsO4)2

Composition:

Molecular Weight = 472.16 gm

Zinc 27.70 % Zn 34.48 % ZnO

Copper 13.46 % Cu 16.85 % CuO

Arsenic 31.74 % As 48.68 % As₂O₅

Oxygen 27.11 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Zn₂Cu(AsO₄)₂

IMA Status:

Approved IMA 1960

Locality:

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

Synonym:

ICSD 100249

PDF 29-1422

Stranskiite Image

Images:

Stranskiite

Comments: Blue fibrous Stranskiite veinlets in white quartz.
Location: Tsumeb, Oshikoto, Namibia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Stranskiite Crystallography

Axial Ratios:

a:b:c =0.7606:1:0.7897

Cell Dimensions:

a = 5.073, b = 6.669, c = 5.267, Z = 1; alpha = 109.85°, beta = 112.14°, gamma = 86.88° V = 155.02 Den(Calc)= 5.06

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 3.134(1), 2.788(0.8), 2.506(0.6),

Crystal Structure:

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Plieth K , Sanger G , Zeitschrift fur Kristallographie , 124 (1967) p.91-100, Die struktur des stranskiits Zn2Cu(AsO4)2

View Additional jPOWD Structure files for Stranskiite
[1]

Physical Properties of Stranskiite

Color:

Cyanic blue.

Density:

5.23

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

4 - Fluorite

Optical Properties of Stranskiite

Gladstone-Dale:

CI meas= 0.012 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.021 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1654,KPDmeas= 0.16,KC= 0.162

Optical Data:

Biaxial (-), a=1.795, b=1.842, g=1.874, bire=0.0790, 2V(Calc)=76, 2V(Meas)=80.

Calculated Properties of Stranskiite

Electron Density:

r_electron=4.85 gm/cc
note: r_Stranskiite=5.23 gm/cc.

Fermion Index

Fermion Index = 0.01148
Boson Index = 0.98852

Photoelectric:

PE_Stranskiite= 42.52 barns/electron
U=PE_Stranskiite x r_electron= 206.27 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Stranskiite is Not Radioactive

Stranskiite Classification

Dana Class:

38.3.7.1 (38)Anhydrous Phosphates, etc

(38.3)(A+ B++)3 (XO4)2

(38.3.7)Dana Group

38.3.7.1 Stranskiite Zn2Cu(AsO4)2 P1 1

Strunz Class:

VII/A.09-20 VII - Phosphates, Arsenates and Vanadates

VII/A - Waterfree phosphates [PO4]3- without unfamiliar anions, cations of medium and big size: Mg, Mn,Fe, Cu, Zn, and Ca, Na

VII/A.09 - Lammerite - Xanthiosite series

VII/A.09-10 Lammerite Cu3[(As,P)O4]2 P 2₁/a 2/m

VII/A.09-20 Stranskiite Zn2Cu(AsO4)2 P1 1

VII/A.09-30 Keyite Cu3(Zn,Cu)4Cd2(AsO4)6·2(H2O) I2/a 2/m

VII/A.09-40 Xanthiosite Ni3(AsO4)2 P 2₁/a 2/m

Other Stranskiite Information

References:

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

See Also:

Links to other databases for Stranskiite :
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 - WWW-MINCRYST 13 -École des Mines de Paris

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Stranskiite

Zn2Cu++(AsO4)2
Dana No: 38.3.7.1 Strunz No: VII/A.09-20
Locality:

Notes: