Uvarovite

Formula: Ca₃Cr₂(SiO₄)₃

Origin of name: for Count Uvarov, Russian nobleman

Crystal system: cubic

Crystal class: 4/m -3 2/m

Twinning:

Unit cell: a = 12.00 Å

Colour: emerald-green

Diaphaneity: 

Luster: vitreous

Habit: crystals dodecahedrons or trapezohedrons, massive, coarse granular, embedded grains

Hardness: 6.5 to 7

Specific gravity: 3.4 to 3.8

Cleavage: none

Tenacity: brittle

Streak: white

Synonyms/varieties: hanleite

Comments: series with grossular, member of garnet group