Soddyite

Formula: (UO₂)₂SiO₄.2H₂O

Origin of name: for F. Soddy, British chemist

Crystal system: orthorhombic

Crystal class: 2/m 2/m 2/m

Twinning:

Unit cell: a = 8.32 Å, b = 11.21 Å, c = 18.71 Å

Colour: amber yellow to canary-yellow

Diaphaneity: 

Luster: vitreous to resinous, dull to earthy

Habit: crystals bipyramidal, striated horizontally, to 3 mm, sometimes thick tabular, aggregates, radial fibrous, earthy

Hardness: 3.5

Specific gravity: 4.70

Cleavage: 2; {001} perfect, {111} good

Tenacity: 

Streak: yellow powder

Synonyms/varieties:

Comments: