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 % As2 O5
Hydrogen 0.79 % H 7.06 % H2 O
Oxygen 31.37 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Zn3 (AsO4 )2 •2(H2 O)
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 - Pinacoidal H-M Symbol ( 1 ) Space Group: P1
X Ray Diffraction:
By Intensity(I/Io ): 2.82(1), 2.87(0.8), 6.21(0.8),
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:
PEWarikahnite = 39.76 barns/electronU=PEWarikahnite x r Electron 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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Warikahnite
Zn3(AsO4)2•2(H2O)
Dana No: 40.03.01.01 Strunz No: 08.CA.35
Locality:
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