Warikahnite Mineral Data

Warikahnite Mineral Data +

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General Warikahnite Information

Chemical Formula:

Zn3(AsO4)2·2(H2O)

Composition:

Molecular Weight = 510.04 gm

Zinc 38.46 % Zn 47.87 % ZnO

Arsenic 29.38 % As 45.06 % As₂O₅

Hydrogen 0.79 % H 7.06 % H₂O

Oxygen 31.37 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Zn₃(AsO₄)₂·2(H₂O)

IMA Status:

Approved IMA 1979

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 100347

PDF 33-1468

Warikahnite Image

Images:

Warikahnite

Comments: Divergent, acicular aggregate of yellowish, brownish orange warikahnite crystals on a white quartz matrix. William Pinch collection. Featured on the cover of the Mineralogical Record, 36:4..
Location: O stope, 31st level, Tsumeb mine, Namibia.. Scale: 3 x 4.9 cm.
© Jeff Scovil

Warikahnite Crystallography

Axial Ratios:

a:b:c =0.7464:1:1.6189

Cell Dimensions:

a = 6.71, b = 8.989, c = 14.553, Z = 4; alpha = 105.59°, beta = 93.44°, gamma = 108.68° V = 799.51 Den(Calc)= 4.24

Crystal System:

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

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

By Intensity(I/I_o): 2.82(1), 2.87(0.8), 6.21(0.8),

Crystal Structure:

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Riffel H , Keller P , Hess H , Tschermaks Mineralogische und Petrographische Mitteilungen , 27 (1980) p.187-199, Die kristallstruktur von warikahnit, Zn3[(H2O)2|(AsO4)2], Locality: Tsumeb mine, Namibia

Physical Properties of Warikahnite

Cleavage:

[001] Perfect, [010] Good, [100] Good

Color:

Colorless, Honey yellow, Light yellow.

Density:

4.24

Streak:

white

Optical Properties of Warikahnite

Gladstone-Dale:

CI meas= -0.033 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.033 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1783,KPDmeas= 0.1783,KC= 0.1727

Optical Data:

Biaxial (+), a=1.747, b=1.753, g=1.768, bire=0.0210, 2V(Calc)=66, 2V(Meas)=75.

Calculated Properties of Warikahnite

Electron Density:

r_electron=3.99 gm/cc
note: r_Warikahnite=4.24 gm/cc.

Fermion Index

Fermion Index = 0.01592
Boson Index = 0.98408

Photoelectric:

PE_Warikahnite= 39.76 barns/electron
U=PE_Warikahnite x r_electron= 158.67 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Warikahnite is Not Radioactive

Warikahnite Classification

Dana Class:

40.3.1.1 (40)Hydrated Phosphates, etc

(40.3)where (A++)3 (XO4)2 · x(H2O)

(40.3.1)Dana Group

40.3.1.1 Warikahnite Zn3(AsO4)2·2(H2O) P1 1

Strunz Class:

VII/C.07-40 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions. cations of medium and small size: Be and Mn, Fe, Cu, Zn, Mg

VII/C.07 - Schubnelite - Warikahnite series

VII/C.07-05 Serrabrancaite! MnPO4·(H2O) C 2/c 2/m

VII/C.07-10 Schubnelite Fe(VO4)(H2O) P1 1

VII/C.07-20 Fervanite Fe4(VO4)4·5(H2O) Unk. Mono

VII/C.07-30 Kolovratite HydrousvanadateofNiandZn ? Mono

VII/C.07-40 Warikahnite Zn3(AsO4)2·2(H2O) P1 1

Other Warikahnite 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 Warikahnite :
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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Warikahnite

Zn3(AsO4)2·2(H2O)
Dana No: 40.3.1.1 Strunz No: VII/C.07-40
Locality:

Notes: