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