Formula: Sn(Nb,Ta)2O6
Origin of name: For Eugene E. Foord, American mineralogist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Brownish yellow with greenish tint
Diaphaneity:
Luster: Vitreous to adamantine
Habit:
Hardness: 6
Specific gravity: 6.734
Cleavage: 2; {100} perfect, {011} poor
Tenacity:
Streak:
Synonyms/varieties:
Comments: Series with thoreaulite
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