Formula: CaBe(AsO4)(OH)
Origin of name: After locality; Langban mine, Bergslagen, Sweden
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Colourles, whitish or grayish
Diaphaneity: Translucent
Luster: Vitreous
Habit: Coarse aggregates to a cm, of elongated crystals
Hardness: 5
Specific gravity: 3.40
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments: Fluoresces pale shades of green, yellowish brown and blue under SW
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