Formula: (Ca,Na)2Ta2O6(O,OH,F)
Origin of name: From Greek for little
Crystal system: Cubic
Crystal class: 4/m -3 2/m
Twinning:
Unit cell:
Colour: Pale yellow to brown, reddish, emerald-green
Diaphaneity: Translucent to opaque
Luster: Vitreous to resinous
Habit: Crystals octahedral; embedded grains; irregular masses
Hardness: 5 to 5.5
Specific gravity: 4.3 to 5.7
Cleavage: 1; {111} sometimes distinct, or parting
Tenacity:
Streak:
Synonyms/varieties:
Comments: Series with pyrochlore
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