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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).
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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