Carnallite

Formula:  KMgCl3 . 6H2O

Origin of name:  For R. von Carnall (1804-1874), Prussian mining engineer

 

Crystal system:  Orthorhombic

Crystal class:  2/m 2/m 2/m

Twinning:

Unit cell: a = 9.56, b = 16.05, c = 22.56

 

Colour:  Colourless, white, yellow, blue

Diaphaneity:  Transparent to translucent

Luster:  Greasy

Habit:  Crystals thick tabular or pseudo-hexagonal pyramidal; massive, granular

Hardness:  2.5

Specific gravity:  1.602

Cleavage:  None

Tenacity: Conchoidal fracture

Streak: White

 

Synonyms/varieties:

 

Comments:

 

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