Formula: K(CaNa)(Mg,Fe)5Si8O22(F,OH)2
Origin of name: from potassium, fluorine and richterite
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: light gray
Diaphaneity:
Luster: vitreous
Habit:
Hardness: 5 to 6
Specific gravity:
Cleavage: 1; {110} perfect
Tenacity:
Streak: white
Synonyms/varieties:
Comments: potassium and fluorine analogue of richterite
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