Formula: An7Cu(OH)13[SiO(OH)3SO4]
Origin of name: for Karl Becherer, Austrian mineralogist
Crystal system: Hexagonal
Crystal class: -3
Twinning:
Unit cell:
Colour: Light green
Diaphaneity: Transparent
Luster: Vitreous
Habit: Druses and hemispheres of acicular crystals, up to 40 µm across and 250 µm long
Hardness: 2 to 3
Specific gravity: 3.45
Cleavage: 1; {001} perfect
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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