Formula: Ca5(SiO4,PO4,SO4)3(F,OH,Cl)
Origin of name: From fluorine and ellestadite series
Crystal system: Hexagonal
Crystal class: 6/m
Twinning:
Unit cell:
Colour: Blue to pale bluish green
Diaphaneity: Transparent
Luster: Vitreous, greasy
Habit: Hexagonal prismatic poorly terminated crystals to 3 mm long, as fine-grained aggregates
Hardness: 4.5
Specific gravity: 3.03
Cleavage: 2; {0001}, {10-10} indistinct and uncertain
Tenacity:
Streak: White, slightly bluish
Synonyms/varieties:
Comments: Series with hydroxylellestadite
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