Formula: (Cu,Zn)16(TeO3)(TeO4)2Cl(OH)25.27H2O
Origin of name: for Tlaloc, the god of rain in the Toltec and Aztec civilizations, in allusion to its high water content.
Crystal system: Orthorhombic
Crystal class: unknown
Twinning:
Unit cell: a = 16.78, b = 19.985, c = 12.069
Colour: Blue, Capri blue
Diaphaneity: Semitransparent
Luster:
Habit: crystals lath-shaped, to 10 micron, in arcuate bands or spherules forming velvety crusts
Hardness: 1
Specific gravity: 4.55
Cleavage:
Tenacity: Sectile and gummy
Streak: Very pale blue
Synonyms/varieties:
Comments: Secondary copper-zinc mineral.
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