Zincroselite Mineral Data

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General Zincroselite Information

Chemical Formula:

Ca2Zn(AsO4)2•2(H2O)

Composition:

Molecular Weight = 459.41 gm

Calcium 17.45 % Ca 24.41 % CaO

Zinc 14.23 % Zn 17.72 % ZnO

Arsenic 32.62 % As 50.03 % As₂O₅

Hydrogen 0.88 % H 7.84 % H₂O

Oxygen 34.83 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₂Zn(AsO₄)₂•2(H₂O)

Environment:

Tsumeb, Namibia.

IMA Status:

Approved IMA 1986

Locality:

Secondary mineral in an oxidized zone of a dolostone-hosted hydrothermal polymetallic ore deposit. Link to MinDat.org Location Data.

Name Origin:

Named for its content of zinc and relation to roselite.

Name Pronunciation:

Zincroselite + Pronunciation

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Zincroselite Crystallography

Axial Ratios:

a:b:c =0.4524:1:0.4378

Cell Dimensions:

a = 5.832, b = 12.889, c = 5.644, Z = 2; beta = 107.72° V = 404.12 Den(Calc)= 3.78

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

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

By Intensity(I/I_o): 3(1), 3.22(0.8), 5.1(0.6),

Crystal Structure:

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Keller P , Lissner F , Schleid T , European Journal of Mineralogy , 16 (2004) p.353-359, The crystal structures of zincroselite and gaitite: Two natural, polymorphs of Ca2Zn[AsO4]2*2H2O from Tsumeb, Namibia, Locality: Tsumeb, Namibia

Physical Properties of Zincroselite

Cleavage:

{???} Good

Color:

Colorless, White.

Density:

3.75

Diaphaneity:

Transparent

Hardness:

3 - Calcite

Streak:

white

Optical Properties of Zincroselite

Gladstone-Dale:

CI meas= -0.014 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.006 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1881,KPDmeas= 0.1896,KC= 0.187
Ncalc = 1.7 - 1.71

Optical Data:

Biaxial (+), a=1.703, b=1.71, g=1.72, bire=0.0170, 2V(Calc)=82, 2V(Meas)=50-57.

Calculated Properties of Zincroselite

Electron Density:

Bulk Density (Electron Density)=3.62 gm/cc
note: Specific Gravity of Zincroselite =3.78 gm/cc.

Fermion Index:

Fermion Index = 0.0062396803
Boson Index = 0.9937603197

Photoelectric:

PE_Zincroselite= 31.40 barns/electron
U=PE_Zincroselite x rElectron Density= 113.69 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Zincroselite is Not Radioactive

Zincroselite Classification

Dana Class:

40.02.03.03 (40)Hydrated Phosphates, etc

(40.02)where A++ (B++)2 (XO4) · x(H2O)

(40.02.03)Roselite Subgroup (Monoclinic: P21/c)

40.02.03.01 Roselite Ca2(Co,Mg)(AsO4)2•2(H2O) P 2₁/c 2/m

40.02.03.02 Brandtite Ca2(Mn,Mg)(AsO4)2•2(H2O) P 2₁/c 2/m

40.02.03.03 Zincroselite Ca2Zn(AsO4)2•2(H2O) P 2₁/c 2/m

40.02.03.04 Wendwilsonite Ca2(Mg,Co)(AsO4)2•2(H2O) P 2₁/c 2/m

40.02.03.05 Manganlotharmeyerite! Ca(Mn,Mg,)2(AsO4)2(OH,H2O)2 C 2/m 2/m

Strunz Class:

08.CG.10 08 - PHOSPHATES, ARSENATES, VANADATES

08.C - Phosphates without Additional Anions, with H2O

08.CG -With large and medium-sized cations, RO4:H2O = 1:1

08.CG.10 Brandtite Ca2(Mn,Mg)(AsO4)2•2(H2O) P 2₁/c 2/m

08.CG.10 Roselite Ca2(Co,Mg)(AsO4)2•2(H2O) P 2₁/c 2/m

08.CG.10 Roselite-beta Ca2(Co,Mg)(AsO4)2•2(H2O) P 1 or P1 Tri

08.CG.10 Zincroselite Ca2Zn(AsO4)2•2(H2O) P 2₁/c 2/m

08.CG.10 Wendwilsonite Ca2(Mg,Co)(AsO4)2•2(H2O) P 2₁/c 2/m

Other Zincroselite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Am.Min.,Vol.73,p932,1988) OPTIC PROP.(Am.Min.,Vol.73,p932,1988)

See Also:

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

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Zincroselite

Ca2Zn(AsO4)2•2(H2O)
Dana No: 40.02.03.03 Strunz No: 08.CG.10
Locality:

Notes: