Formula: (Mg,Fe)2Al14B4Si4O37
Origin of name: for Gunter Werding, professor of mineralogy, Institut für Mineralogie, Ruhr University, Bochum, Germany.
Crystal system: Triclinic
Crystal class: 1
Twinning: common
Unit cell: a = 7.995, b = 8.152, c = 11.406, α = 110.45°, β = 110.85°, γ = 84.66°
Colour: Brownish yellow
Diaphaneity: Translucent
Luster: Vitreous
Habit: Anhedral to subhedral xenoblasts to 3 mm, commonly twinned
Hardness: 7
Specific gravity: 3.04
Cleavage: 1, indistinct
Tenacity:
Streak: Buff white
Synonyms/varieties:
Comments:
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