Formula: (NH4)Al(SO4)2.12H2O
Origin of name: after locality Tschermig, Bohemia, Czech Republic
Crystal system: cubic
Crystal class: 2/m -3
Twinning:
Unit cell:
Colour: colourless, white
Diaphaneity: transparent
Luster: brilliant, vitreous
Habit: crystals octahedral, massive, columnar fibrous, efflorescence
Hardness: 1.5
Specific gravity: 1.64
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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