Warikahnite Mineral Data

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)

Environment:

Secondary arsenate mineral in zinc-bearing ore deposit.

IMA Status:

Approved IMA 1979

Locality:

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

Name Origin:

Named for Walter Richard Kahn, collector of Tsumeb minerals, Bayersoien, Germany.

Name Pronunciation:

Warikahnite + Pronunciation

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, Orange.

Density:

4.24

Diaphaneity:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

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

Hardness:

2 - Gypsum

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Warikahnite

Gladstone-Dale:

CI meas= -0.033 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.023 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1766,KPDmeas= 0.1783,KC= 0.1727
Ncalc = 1.73 - 1.74

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:

Bulk Density (Electron Density)=4.03 gm/cc
note: Specific Gravity of Warikahnite =4.28 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Warikahnite= 39.76 barns/electron
U=PE_Warikahnite x rElectron Density= 160.16 barns/cc.

Radioactivity:

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

Warikahnite Classification

Dana Class:

40.03.01.01 (40)Hydrated Phosphates, etc

(40.03)where (A++)3 (XO4)2 · x(H2O)

(40.03.01)Dana Group

40.03.01.01 Warikahnite Zn3(AsO4)2•2(H2O) P1 1

Strunz Class:

08.CA.35 08 - PHOSPHATES, ARSENATES, VANADATES

08.C - Phosphates without Additional Anions, with H2O

08.CA -With small and large/medium cations

08.CA.35 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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Ask about Warikahnite here :
Ask-A-Mineralogist from the Mineralogical Society of America
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Print or Cut-and-Paste your Warikahnite Specimen Label here :

Warikahnite

Zn3(AsO4)2•2(H2O)
Dana No: 40.03.01.01 Strunz No: 08.CA.35
Locality:

Notes: