Formula: CuCl
Normal halide, chlorargyrite group
Specific gravity: 3.93 to 4.3
Hardness: 2 to 2½
Streak: White
Colour: Colourless, white to greyish, greenish

Hydrothermal environments
Volcanic sublimates rarely

Nantokite occurs as a secondary mineral in hydrothermal copper-bearing deposits, and rarely in volcanic sublimates. Associated minerals include cuprite, copper, atacamite, paratacamite, claringbullite, cerussite and hematite (HOM). It is known only from arid environments and slags. It is unstable in humid air. It is colourless and transparent when fresh and transforms slowly into greenish secondary copper hydroxchlorides such as paratacamite (Mindat).


The type locality is the Carmen Bajo Mine, Candelaria Copper mining complex, Tierra Amarilla, Copiapó Province, Atacama, Chile.

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