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Černýite is a copper-cadmium-tin sulfide with tetragonal crystal system part of the stannite group. Černýite usually forms in complex pegmatite zones,and sometimes as intergrowths of other sulfides minerals like stannite and kesterite it also associates with pyrrhotite,sphalerite,hawleyite,chalcopyrite,stannite, bismuth.

Composition
Černýite's composition is very similar with its mineral group, it has the chemical formula of Cu2(Cd,Zn,Fe)SnS4, with Cd,Cu,S,Sn as its essential elements. Černýite carries very little amounts of sulfide

Structure
Černýite contains small anhedral grains, up to 200 µm in aggregates intergrown with stannite and kesterite. The cell parameters of černýite are: a=5.487 Å, c=10.828  Å, with the calculated unit cell volume of V 326.00 Å cubic. The crystal system is tetragonal scalenohedral, and it has the X-ray diffraction of 3.167(1), 1.939(0.7), 1.662(0.5).

Physicasl Properties
Černýite is a steel grey mineral with metallic luster, weathered its surfaces are greenish grey to iron-black. The mineral has Hardness(Mohs)of 4, with a calculated density of 4.76, its diaphaneity is opaque,it contains black streak and it does not present any cleavage.

Geologic Occurrence
Cernyite occurs in pegmatite zones like Tanco Mine (Bernic Lake Mine), Bernic Lake, Lac-du-Bonnet area, Manitoba, Canada; Hugo Mine, Keystone, Keystone District, Pennington Co., South Dakota, United States.

Origin of the Name
Černýite was named in honour of Dr. Petr Černý,a world renowned pegmatite expert from University of Manitoba, Canada. Cerny has written more than 250 scientific articles about pegmatites or in pegmatology (the term was coined by his students at University of Manitoba), he also has won more than 25 international awards and two of the most prestigious geoscience honors in Canada, the Logan Medal from GAC and the Past President’s Medal from MAC.