Formula: Pb(Co,Ni,Zn)2(AsO4)2·2H2O
Origin of name: Named after the locality, Dump material from the Rappold mine near Schneeberg, Saxony, Germay.
Crystal system: Triclinic
Crystal class: 1
Twinning:
Unit cell: a = 11.19, b = 10.548, c = 7.593, α = 100.38°, β = 109.59°, γ = 98.96°
Colour: Red, reddish brown
Diaphaneity: Translucent
Luster: Vitreous
Habit: Rosettes, aggregates, prismatic crystals
Hardness: 4.5
Specific gravity:
Cleavage: None
Tenacity: Brittle, conchoidal fracture
Streak: Light yellow-brown
Synonyms/varieties:
Comments:
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