Warikahnite
Rare zinc arsenate mineral / From Wikipedia, the free encyclopedia
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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]
Warikahnite | |
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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] |