Formula: BaAl2Si2(O,OH)8 . H2O
Origin of name: Locality; Cymru, old Welsh for Wales
Crystal system: Monoclinic
Crystal class: m
Twinning:
Unit cell:
Colour: Colourless; dark green or brown from inclusions
Diaphaneity: Transparent to translucent
Luster: Vitreous to satiny
Habit: Crystals hexagonal prisms, tiny, or crude hexagonal plates; massive, fibrous
Hardness: 2 to 3
Specific gravity: 3.413
Cleavage: 2; {0001} perfect, {10-10} imperfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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