Formula: Cu19Cl4(NO3)2(OH)32 . 2H2O
Origin of name: For H. Buttgenbach, Belgian mineralogist
Crystal system: Hexagonal
Crystal class: 6/m 2/m 2/m
Twinning:
Unit cell:
Colour: Azure-blue
Diaphaneity: Translucent
Luster: Vitreous
Habit: Crystals acicular, striated parallel to elongation; radiating sprays, felt-like masses
Hardness: 3
Specific gravity: 3.42
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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