Abernathyite
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Abernathyite is a mineral with formula K(UO2)(AsO4)·3H2O. The mineral is named after Jesse Evrett Abernathy (1913–1963) who first noted it in 1953 in the U.S. State of Utah. It was described as a new mineral species in 1956. Abernathyite is yellow and occurs as small crystals.
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Abernathyite | |
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General | |
Category | Arsenate minerals |
Formula (repeating unit) | K(UO2)(AsO4)·3H2O[1] |
IMA symbol | Abn[2] |
Strunz classification | 8.EB.15 |
Dana classification | 40.2a.9.1 |
Crystal system | Tetragonal |
Crystal class | Ditetragonal dipyramidal (4/mmm) H-M symbol: (4/m 2/m 2/m) |
Space group | P4/ncc[3][4] |
Unit cell | a = 7.176, c = 18.126 [Å] Z = 4 |
Identification | |
Color | Yellow |
Cleavage | Perfect on {001} |
Tenacity | Brittle |
Mohs scale hardness | 2.5–3 |
Luster | Sub-Vitreous, resinous, waxy, greasy |
Streak | Pale yellow |
Diaphaneity | Transparent |
Specific gravity | 3.32 (measured) 3.572 (calculated) |
Optical properties | Uniaxial (−) |
Refractive index | nω = 1.597 – 1.608 nε = 1.570 |
Birefringence | δ = 0.027 – 0.038 |
Pleochroism | Weak |
2V angle | 5° (measured) |
Ultraviolet fluorescence | Yellow-green in longwave and shortwave UV[4] |
Other characteristics | Radioactive |
References | [3] |
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