Formula: Ca14Nb2(Si2O7)4O6F2
Origin of name: from composition
Crystal system: monoclinic
Crystal class: m
Twinning: on b-axis
Unit cell:
Colour: yellow
Diaphaneity: transparent
Luster: vitreous
Habit: crystals prismatic, to 10 mm length, twinned on b-axis
Hardness: 5 to 6
Specific gravity: 3.32
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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