Teineite

Formula: CuTeO₃.2H₂O

Origin of name: after locality Teine mine, Hokkaido, Japan

Crystal system: Orthorhombic

Crystal class: 222

Twinning:

Unit cell: a = 6.63, b = 9.615, c = 7.432

Colour: Sky blue to cobalt blue, bluish gray

Diaphaneity: Translucent

Luster: 

Habit: Crystals prismatic to 1 cm, deeply etched, aggregates, crusts

Hardness: 2.5

Specific gravity: 3.80

Cleavage: 2; {001} distinct, {100} indistinct

Tenacity: Brittle

Streak: Bluish white, pale blue

Synonyms/varieties:

Comments: