Černýite

minerals

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).
At the Tanco mine the assemblages of minerals in the pegmatite were deposited in succession from petalite + quartz to spodumene + quartz to eucryptite + quartz (R&M 92.2.153).

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