Cahnite

Formula:  Ca2B(AsO4)(OH)4

Origin of name:  For Lazard Cahn, American collector

 

Crystal system:  Tetragonal

Crystal class:  -4

Twinning:  Common on {110}, often cruciform

Unit cell: a = 7.095 Ǻ, c = 6.190 Ǻ

 

Colour:  Colourless to white

Diaphaneity:

Luster:  Vitreous

Habit:  Crystals pseudo-tetrahedral

Hardness:  3

Specific gravity:  3.156

Cleavage:  1; {110} perfect

Tenacity:  Brittle

Streak:

 

Synonyms/varieties:

 

Comments:

 

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