Formula: K2Mg2(SO4)3
Origin of name: For A. Langbein, German chemist
Crystal system: Cubic
Crystal class: 23
Twinning:
Unit cell:
Colour: Colourless, whitish, gray, yellowish, greenish, pinkish to reddish, violet
Diaphaneity: Transparent
Luster: Vitreous
Habit: Crystals rare; massive, nodular masses; bedded; disseminated grains
Hardness: 3.5 to 4
Specific gravity: 2.83
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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