Ianthinite

Formula:  UO₂ ^. 5UO₃ ^. 10H₂O

Origin of name:  From Greek for violet coloured

Crystal system:  Orthorhombic

Crystal class:  Unknown

Twinning: 

Unit cell: 

Colour:  Black to violet

Diaphaneity:  Transparent

Luster:  Submetallic

Habit:  Crystals platy or lath-like, minute, elongated on b-axis, or prismatic or thick tabular

Hardness:  2 to 3

Specific gravity:  5.16

Cleavage:  2; {001} perfect, {100}

Tenacity: 

Streak:  Brownish violet

Synonyms/varieties:

Comments: