M MineralystRock & Mineral Guide
Mineral

Autunite

Autunite — reference photo

Autunite is a mineral with the chemical formula Ca(UO2)2(PO4)2·10-12H2O. It has a Mohs hardness of 2.5-3 and vitreous to pearly luster.

Autunite properties

TypeMineral
Chemical formulaCa(UO2)2(PO4)2·10-12H2O
Mohs hardness2.5-3
LusterVitreous to pearly
Typical colorsYellow to greenish-yellow
FormationTypically forms in sedimentary rocks, particularly from the alteration of uraninite and phospate deposits
Rarity6 / 10

Mohs hardness 2.5–3 — soft

1 · Talc5 · Apatite10 · Diamond
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