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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