Formula: Mg(Fe,Al)(BO3)O
Origin of name: for Prof. Yuan Fuliv (1893-1987), Chinese geologist
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 9.258, b = 9.351, c = 3.081
Colour: Black
Diaphaneity: Opaque, translucent on thin edges
Luster: Submetallic to adamantine
Habit: Prismatic crystals 0.1 x 0.2 x 1 mm
Hardness: 5 to 6
Specific gravity: 3.80
Cleavage: 1; {100} perfect
Tenacity:
Streak: Brownish black
Synonyms/varieties:
Comments: Fe analogue of warwickite
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