Carnotite

Formula:  K₂(UO₂)₂V₂O₈ ^. 3H₂O

Origin of name:  For M. Carnot, French mining engineer

Crystal system:  Monoclinic

Crystal class:  2/m

Twinning:

Unit cell: a = 10.47 Ǻ, b = 8.41 Ǻ, c = 6.59 Ǻ, β = 103.8°

Colour:  bright yellow to golden yellow, greenish yellow

Diaphaneity:

Luster:  Pearly, masses dull or earthy

Habit:  Crystals microscopic, rhombic or diamond-shaped outline; disseminated, coatings, powdery, masses crusts

Hardness:

Specific gravity:  4.70

Cleavage:  1; {001} perfect, micaceous

Tenacity:

Streak:

Synonyms/varieties:

Comments: