Formula: H6(Ca,Pb)2(Cu,Zn)3(SO4)(TeO3)4(TeO6)
Origin of name: from Nahua word tlapalli = paint, in allusion to its paint-like coating of rock surfaces
Crystal system: Monoclinic
Crystal class: unknown
Twinning:
Unit cell: a = 11.97, b = 9.11, c = 15.66, β = 90.04°
Colour: Green, Veridian green to Cyprus green
Diaphaneity: Semitransparent
Luster: Vitreous
Habit: Crystals minute, radiating aggregates of scales, form thin films
Hardness: 3
Specific gravity: 5.38
Cleavage: None
Tenacity:
Streak: Pale green
Synonyms/varieties:
Comments: Very rare in partially oxidized portions of a tellurium-bearing polymetallic hydrothermal sulfide deposit (Moctezuma mine, Mexico); an alteration product of tellurides in calcsilicate tactite (Tombstone, Arizona).
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