<unk>  is a chemical compound with the formula<unk> .  It exists in nature as two different minerals, greenockite and hawleyite.
Greenockite forms hexagonal crystals with the wurtzite structure.  It has a yellowish colour with specific gravity of 4.7 and Mohs hardness of 3.8.  Hawleyite has the sphalerite (zinc blende) structure.
Synthetic cadmium pigments based on<unk>  are valued for their good thermal stability in many polymers, for example in engineering plastics.  By adding selenium in its formula its possible to obtain colors ranging from a greenish yellow to red violet pigment.  The weather resistance for this pigment is 8 in full tone, which means that it is a good pigment for UV.<unk>  is a direct bandgap semiconductor with a bandgap of 2.42 eV.  It has useful properties for optoelectronics, being used in both photosensitive and photovoltaic devices. One simple use is as a photoresistor whose electrical resistance changes with incident light levels.
Mixed with zinc<unk> ,<unk>  acts as a phosphor with long afterglow.<unk>  was used as a pigment in paints as far back as 1819, although it wasn't big on any market until the mid-nineteenth century because of how rare the substance is.  Most<unk>  used in paints is manufactured in laboratories through chemical means in modern times.
Painters like Claude Monet liked this pigment because it had a nice, cool shade of yellow, good for outdoor-type paintings.
Cadmium sulfide
Cadmium oxide
Arsenic tribromide
Chromium carbide
Carbon suboxide
Vinyl chloride
Cadmium chloride
Formaldehyde