Formula: (U,Th)(Ca,Na)2(K1-x[]x)Si8O20·H2O
Origin of name:
Crystal system: Tetragonal
Crystal class: 4/m
Twinning:
Unit cell: a = 7.6506 Å, c = 14.9318 Å
Colour: Dark green
Diaphaneity: Transparent
Luster: Vitreous
Habit:
Hardness:
Specific gravity:
Cleavage:
Tenacity:
Streak:
Synonyms/varieties:
Comments: IMA approved 2003, belongs to steacyite group
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