Global InformationMetarauchite information
| Metarauchite | |
|---|---|
| General | |
| Category | Uranyl Arsenates |
| Formula (repeating unit) | Ni(UO2)2(AsO4)2·8H2O |
| IMA symbol | Mrau[1] |
| Strunz classification | 08.EB.05 |
| Dana classification | 40.02a.17.02 |
| Crystal system | Triclinic |
| Crystal class | Pinacoidal H-M symbol: 1 |
| Space group | P1 |
| Unit cell | a = 7.194(4) b = 9.713(5) c = 13.201(9) α = 75.79(5)° β = 83.92(3)° γ = 81.59(4)° |
| Identification | |
| Color | Yellow to light greenish yellow |
| Crystal habit | Tabular crystals |
| Twinning | Multiply twinned along {011} |
| Cleavage | Perfect on (011) |
| Fracture | Uneven |
| Tenacity | Very brittle |
| Mohs scale hardness | 2 |
| Luster | Vitreous – pearly |
| Streak | Light green to pale yellow |
| Diaphaneity | Transparent to translucent |
| Density | 3.81 gm/cc |
| Optical properties | Biaxial (−) |
| Birefringence | δ = 0.024 |
| Pleochroism | Non-pleochroic |
| 2V angle | Measured: 23–52° |
| Ultraviolet fluorescence | None |
| Solubility | Cold 10% HCl |
Metarauchite is a member of the autunite group, found at the Jáchymov ore district (type locality), Czech Republic and in Schneeberg, Germany. The autunite group is a group of structured uranyl phosphates and arsenates; the other members of the group are autunite, bassetite,[2] heinrichite, kahlerite, nováčekite-I, nováčekite-II, rauchite,[3] sabugalite,[4] saléeite, torbernite, uranocircite, uranospinite, and zeunerite. The mineral is named after Czech mineral collector Luděk Rauch, who died in the Jáchymov mines during mineral prospecting.[5]
- ^ 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.
- ^ http://webmineral.com/data/Bassetite.shtml#.WhxsH0qnEuU
- ^ https://www.mindat.org/min-43270.html
- ^ http://webmineral.com/data/Sabugalite.shtml#.Whxys0qnGUk
- ^ Cite error: The named reference
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