Formula: (K,Na,Ca)3(Mn,Fe)7(Zr,Nb)2Si8O27(OH,F)4
Origin of name: from zirconium and astrophyllite
Crystal system: Triclinic
Crystal class: 1
Twinning:
Unit cell:
Colour: Dark brown, black brown, black
Diaphaneity: Translucent to opaque
Luster: Vitreous to adamantine
Habit: crystals platy
Hardness: 4 to 4.5
Specific gravity: 3.34
Cleavage: 1; {001} perfect
Tenacity: Brittle
Streak: Pale brown
Synonyms/varieties:
Comments:
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