Zirklerite

Formula: (Fe,Mg)9Al4Cl18(OH)12.14H2O

Origin of name: for Bergrat Zirkler, director of the Aschersleben potash works, Germany.

 

Crystal system: Hexagonal

Crystal class: Unknown

Twinning:

Unit cell: 

 

Colour: Light gray, white

Diaphaneity: Transparent to translucent

Luster: Vitreous, dull

Habit: Massive, granular to fibrous

Hardness: about 3.5

Specific gravity: about 2.6

Cleavage: [1011] perfect

Tenacity: 

Streak: White

 

Synonyms/varieties:

 

Comments:

 

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