Černýite

cernyite

stannite

kesterite

hawleyite

Images

Formula: Cu2CdSnS4
Sulphide, stannite group, copper, cadmium and tin bearing mineral
Specific gravity: 4.76 calculated
Hardness: 4
Streak: Black
Colour: Steel grey
Environments

Pegmatites

Černýite is a rare constituent of complex zoned pegmatites, as a component of a very minor sulphide mineral suite. Associated minerals include pyrrhotite, sphalerite, hawleyite, chalcopyrite, stannite, bismuth and kësterite (HOM, Mindat).

Localities

There are two co-type localities, the Tanco mine, Bernic Lake, Lac-du-Bonnet area, Manitoba, Canada, and the Hugo mine, Keystone, Keystone Mining District, Pennington county, South Dakota, USA. Černýite is a rare constituent of complex, zoned pegmatites at both localities. It occurs as small grains intergrown with kësterite. Associated minerals include stannite and various other sulphides (AM 64.653).
The Tanco is a complex lithium petalite granite pegmatite where the assemblages of minerals were deposited in succession from petalite + quartz to spodumene + quartz to eucryptite + quartz (R&M 92.2.153).

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