Zincroselite Mineral Data

Zincroselite Mineral Data +

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)

IMA Status:

Approved IMA 1986

Locality:

Link to MinDat.org Location Data.

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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

Diaphaniety:

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

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:

r_electron=3.62 gm/cc
note: r_Zincroselite=3.78 gm/cc.

Fermion Index

Fermion Index = 0.00623
Boson Index = 0.99377

Photoelectric:

PE_Zincroselite= 31.40 barns/electron
U=PE_Zincroselite x r_electron= 113.69 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Zincroselite is Not Radioactive

Zincroselite Classification

Dana Class:

40.2.3.3 (40)Hydrated Phosphates, etc

(40.2)where A++ (B++)2 (XO4) · x(H2O)

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

40.2.3.1 Roselite Ca2(Co,Mg)(AsO4)2·2(H2O) P 2₁/c 2/m

40.2.3.2 Brandtite Ca2(Mn,Mg)(AsO4)2·2(H2O) P 2₁/c 2/m

40.2.3.3 Zincroselite Ca2Zn(AsO4)2·2(H2O) P 2₁/c 2/m

40.2.3.4 Wendwilsonite Ca2(Mg,Co)(AsO4)2·2(H2O) P 2₁/c 2/m

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

Strunz Class:

VII/C.17-120 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions, cations of medium and big size: Fe, Mn, Zn, Mg and Ca, (NH4)1+

VII/C.17 - Collinsite - Wendwilsonite series

VII/C.17-10 Collinsite Ca2(Mg,Fe)(PO4)2·2(H2O) P1 1

VII/C.17-15 Hillite! Ca2(Zn,Mg)[PO4]2·2(H2O) P1 1

VII/C.17-20 Messelite Ca2(Fe,Mn)(PO4)2·2(H2O) P1 1

VII/C.17-30 Fairfieldite Ca2(Mn,Fe)(PO4)2·2(H2O) P1 1

VII/C.17-40 Cassidyite Ca2(Ni,Mg)(PO4)2·2(H2O) P1 1

VII/C.17-50 Talmessite Ca2Mg(AsO4)2·2(H2O) P1 1

VII/C.17-60 Gaitite Ca2Zn(AsO4)2·2(H2O) P1 1

VII/C.17-70 Parabrandtite Ca2Mn(AsO4)·2(H2O) P1,P 1 Tri

VII/C.17-80 Roselite-beta Ca2(Co,Mg)(AsO4)2·2(H2O) P 1 or P1 Tri

VII/C.17-90 Wendwilsonite Ca2(Mg,Co)(AsO4)2·2(H2O) P 2₁/c 2/m

VII/C.17-100 Roselite Ca2(Co,Mg)(AsO4)2·2(H2O) P 2₁/c 2/m

VII/C.17-110 Brandtite Ca2(Mn,Mg)(AsO4)2·2(H2O) P 2₁/c 2/m

VII/C.17-120 Zincroselite Ca2Zn(AsO4)2·2(H2O) P 2₁/c 2/m

Other Zincroselite Information

References:

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 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 -École des Mines de Paris

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Zincroselite

Ca2Zn(AsO4)2·2(H2O)
Dana No: 40.2.3.3 Strunz No: VII/C.17-120
Locality:

Notes: