Karlite

Formula:  Mg7(BO3)3(OH)4Cl0.4

Origin of name:  For Franz Karl, German mineralogist

 

Crystal system:  Orthorhombic

Crystal class:  222

Twinning: 

Unit cell: 

 

Colour:  White to light green

Diaphaneity: 

Luster:  Silky

Habit:  Needles and fibres, minute, in aggregates

Hardness:  5.5

Specific gravity:  2.80 to 2.85

Cleavage:  1; {001} perfect

Tenacity: 

Streak: 

 

Synonyms/varieties:

 

Comments: 

 

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