Conichalcite

Formula:  CaCu(AsO4)(OH)

Origin of name:  From Greek for lime and copper

 

Crystal system:  Orthorhombic

Crystal class:  222

Twinning: 

Unit cell:       a = 7.382 Ǻ       b = 9.235 Ǻ       c = 5.815 Ǻ

 

Colour:  Yellowish green to emerald-green

Diaphaneity: 

Luster:  Vitreous to greasy

Habit:  Crystals equant to short prismatic; botryoidal to reniform crusts, masses with radial-fibrous structure

Hardness:  4.5

Specific gravity:  4.33

Cleavage:  None

Tenacity:  Uneven; brittle

Streak: 

 

Synonyms/varieties:

 

Comments:  Series with austinite, with cobaltaustinite and with calciovolborthite

 

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