Formula: (Ca,Na)6(AsO4)(AsO3OH)3(PO4,SO4) . 15H2O
Origin of name: For Felix Mchatschki, German mineralogist
Crystal system: Hexagonal
Crystal class: 3m
Twinning:
Unit cell:
Colour: Colourless
Diaphaneity: Transparent to translucent
Luster:
Habit: Crystals rhombohedral
Hardness: 2 to 3
Specific gravity: 2.50
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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