Minerals identify

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Autunite

Phosphate mineral

Autunite (hydrated calcium uranyl phosphate), with formula Ca(UO2)2(PO4)2·10–12H2O, is a yellow-greenish fluorescent phosphate with a hardness Autunite crystallizes in the orthorhombic system and often occurs as tabular square crystals , commonly in small crusts or in fan-like masses. Due to the moderate uranium content of 48.27% it is radioactive and also used as uranium ore. Autunite fluoresces bright green to lime green under UV light. The mineral is also called calco-uranite, but this name is rarely used and effectively outdated.

Autunite was discovered in 1852 near Autun , which is also autunite's namesake. It occurs as an oxidation product of uranium minerals in granite and hydrothermal deposits. Associate minerals include metaautunite , phosphuranylite and sabugalite

Identification

Color of mineral

Yellow
Green
Black

Mohs scale ( mineral hardness )

2
2.5

The streak

Yellow

Density ( specific gravity )

1.553
1.575
1.577

Luster ( interacts light )

Pearly
Vitreous

Crystal ( diaphaneity )

Orthorhombic

Radioactive

Radioactive