Formula: (H3O,K,Ca)3(Fe,Mn)5-6Ti2Si8(O,OH)31
Origin of name: From Greek hydor - water and astrophyllite
Crystal system: Triclinic
Crystal class: -1
Twinning:
Unit cell:
Colour: Dark brown
Diaphaneity:
Luster:
Habit: Crystals blocky, aggregates
Hardness:
Specific gravity: 3.15
Cleavage: 2
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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