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| Autunite | |
|---|---|
 Autunite from Daybreak Mine, Washington | |
| General | |
| Category | Phosphate minerals |
| Formula (repeating unit) | Ca(UO2)2(PO4)2·10–12H2O |
| IMA symbol | Aut |
| Strunz classification | 8.EB.05 |
| Crystal system | Orthorhombic |
| Crystal class | Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m) |
| Space group | Pnma |
| Unit cell | a = 14.0135(6), b = 20.7121(8), c = 6.9959(3) ; Z = 4 |
| Identification | |
| Formula mass | 986.26 g/mol |
| Color | Lemon-yellow to sulfur-yellow, greenish yellow to pale green; may be dark green to greenish black |
| Crystal habit | Tabular crystals, foliated or scaly aggregates, and in crusts |
| Twinning | Rare on {110} |
| Cleavage | {001} perfect, {100} and {010} poor |
| Fracture | uneven |
| Mohs scale hardness | 2–2.5 |
| Luster | Vitreous – pearly |
| Streak | Pale yellow |
| Diaphaneity | Transparent to translucent |
| Specific gravity | 3.1–3.2 |
| Density | 3.15 |
| Optical properties | Biaxial (−) |
| Refractive index | nα = 1.553 – 1.555 nβ = 1.575 nγ = 1.577 – 1.578 |
| Birefringence | δ = 0.003 |
| Pleochroism | X = colorless to pale yellow; Y = Z = yellow to dark yellow |
| 2V angle | Measured: 10° to 53° |
| Ultraviolet fluorescence | Strong yellow-green fluorescence in UV; Radioactive |
| Solubility | Soluble in acids |
| Alters to | Dehydrates in air |
| Other characteristics | Pseudotetragonal for synthetic material,  Radioactive |
| References | |
- 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.
- Mindat.org
- Handbook of Mineralogy