Formula: PbFe3(AsO4)(SO4)(OH)6
Origin of name: For Francois Beudant, French mineralogist and physicist
Crystal system: Hexagonal
Crystal class: -3 2/m
Twinning:
Unit cell: a = 7.32 Ǻ, c = 17.02 Ǻ
Colour: Dark green, brown, black, yellow, orange, red
Diaphaneity:
Luster: Vitreous to resinous
Habit: Crystals rhombohedral, pseudocubic
Hardness: 3.5 to 4.5
Specific gravity: 4 to 4.3
Cleavage: 1; {0001} easy
Tenacity:
Streak: Greenish or greyish yellow
Synonyms/varieties:
Comments:
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