Mineralpedia Details for Urancalcarite

Named for its composition of uranium (uran), calcium (cal), and carbonate (car). Urancalcarite occurs in uranium deposits in the oxidized zones in only a few localities including the Democratic Republic of the Congo and China. Urancalcarite is highly very strongly radioactive.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/urancalcarite.pdf

Formula

Ca(UO₂)₃CO₃(OH)₆·3H₂O 

Crystal System

Orthorhombic 

Crystal Habit

Acicular, Radial, Aggregates 

Cleavage

None, None, None 

Color

bright yellow 

Streak

light yellow 

Class

Orthorhombic 

Hardness

2-3 

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Mindat

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Bright yellow earthy spots composed of micro acicular crystals associated with rusty browm Huemulite.