Formula: (Na,K)4Mg2(Fe,Mn)5Ti2Si8O24(O,OH,F)7
Origin of name: From magnesium and astrophyllite
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Yellow
Diaphaneity:
Luster: Vitreous
Habit:
Hardness: 3
Specific gravity: 3.32
Cleavage: 2; {100} and {010} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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