Formula: (Ca,Na)3(Zr,Ti)Si2O8F
Origin of name: for Karl Rosenbusch, German geologist
Crystal system: triclinic
Crystal class: -1
Twinning:
Unit cell:
Colour: gray to orange to brownish
Diaphaneity: transparent in thin fragments
Luster: silky to subvitreous
Habit: crystals prismatic or acicular, to 2 mm, massive, radial-fibrous structure
Hardness: 5 to 6
Specific gravity: 3.15 to 3.30
Cleavage: 1; {100} perfect
Tenacity:
Streak: white
Synonyms/varieties:
Comments: sometimes fluoresces yellowish to greenish white
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