Rokühnite

Formula: FeCl2.2H2O

Origin of name: for Robert Kühn, German mineralogist

 

Crystal system: monoclinic

Crystal class: 2/m

Twinning:

Unit cell: 

 

Colour: colourless

Diaphaneity: transparent

Luster: 

Habit: crystals thick tabular consisting of short, flexible fibers 200 to 300 micron across

Hardness

Specific gravity: 2.35

Cleavage: 2; {110} very good, {010} good

Tenacity: 

Streak: 

 

Synonyms/varieties:

 

Comments: 

 

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