Formula: YTaO4
Origin of name: For Francis G. Forman, Australian geologist
Crystal system: Tetragonal
Crystal class: 4/m
Twinning:
Unit cell:
Colour: Brownish black to black
Diaphaneity:
Luster: Vitreous, submetallic
Habit: Irregular masses or grains
Hardness: 5.5 to 6.5
Specific gravity: 7.03
Cleavage: 1; {111} trace
Tenacity:
Streak:
Synonyms/varieties:
Comments: Series with fergusonite; dimorphous with yttrotantalite
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