| Warikahnite | |
|---|---|
 Warikahnite, Tsumeb mine, Namibia, 0.6 × 0.4 × 0.1 cm | |
| General | |
| Category | Arsenate minerals |
| Formula (repeating unit) | Zn3(AsO4)2·2H2O |
| IMA symbol | War[1] |
| Strunz classification | 8.CA.35 |
| Crystal system | Triclinic |
| Crystal class | Pinacoidal (1) (same H-M symbol) |
| Space group | P1 |
| Unit cell | a = 6.71 Å, b = 8.98 Å c = 14.53 Å; α = 105.59° β = 93.44°, γ = 108.68°; Z = 4 |
| Identification | |
| Formula mass | 510.04 g/mol |
| Color | Pale yellow to colorless; honey-yellow; orange |
| Crystal habit | Acicular; radial |
| Cleavage | [001] perfect, [010] good, [100] good |
| Fracture | Brittle |
| Mohs scale hardness | 2 |
| Luster | Vitreous, waxy |
| Streak | White |
| Diaphaneity | Transparent |
| Specific gravity | 4.28 |
| Optical properties | Biaxial (+) |
| Refractive index | nα = 1.747 nβ = 1.753 nγ = 1.768 |
| Birefringence | δ = 0.021 |
| 2V angle | 75° measured |
| References | [2][3][4][5] |
Warikahnite is a rare zinc arsenate mineral of the triclinic crystal system with Hermann-Mauguin notation 1, belonging to the space group P1.[6] It occurs in the Tsumeb mine in Namibia on corroded tennantite in the second oxidation zone under hydrothermal conditions in a dolomite-hosted polymetallic ore deposit.[5][7] It is associated with adamite, stranskiite, koritnigite, claudetite, tsumcorite, and ludlockite. The origin of discovery was in a dolomite ore formation within an oxidized hydrothermal zone, in the E9 pillar, 31st level of the Tsumeb Mine in Namibia, Southwest Africa.[2][5] It has also been found at Lavrion, Greece and Plaka, Greece as microscopic white needles.[6]
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ a b http://rruff.geo.arizona.edu/doclib/hom/warikahnite.pdf Mineral Handbook
- ^ http://webmineral.com/data/Warikahnite.shtml Webmineral
- ^ http://www.mindat.org/min-4244.html Mindat
- ^ a b c Fleischer, Michael; L. J. Cabri; A. Pabst (1980). "New mineral names" (PDF). American Mineralogist. 65: 406–408. Retrieved 2010-01-03.
- ^ a b Pinch, William W. (July 2005). "Warikahnite: some background on the cover specimen". The Mineralogical Record. 36 (4). The Mineralogical, Inc.: 315(1).
- ^ Anthony, J. W., Bideaux, R. A., Bladh, K. W., and Nichols, M. C. (2000) Handbook of Mineralogy. Volume IV: Arsenates, Phosphates and Vanadates. Mineral Data Publishing Company, Tucson, Arizona, p. 644