Sylvite

Formula: KCl

Origin of name: for F. Sylvius de la Boe, Dutch physician and chemist

 

Crystal system: cubic

Crystal class: 4/m -3 2/m

Twinning: 

Unit cell: a = 6.29 Å

 

Colour: white, gray, bluish, reddish from hematite inclusions

Diaphaneity: transparent

Luster: vitreous

Habit: crystals cubic, octahedrons or cubo-octahedrons rare, massive, compact to granular, crusts, columnar

Hardness: 2

Specific gravity: 1.993

Cleavage: 1; {001} perfect

Tenacity: 

Streak: 

 

Synonyms/varieties:

 

Comments: 

 

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