The most important mineral of zinc is the sulphide, sphalerite or "zinc blende."
In the Missouri region, on the other hand, sphalerite and blende are the typical ores.
sphalerite is a fairly common and widespread mineral, occurring nearly always in veins in most kinds of rocks.
A usually yellow-brown or brownish-black cubic mineral occurring either as single dodecahedral crystals or as granular masses. It often contains cadmium, arsenic, or manganese and has a distinct rotten egg odor. It is often found in association with the mineral galena and is the primary ore of zinc. Chemical formula: ZnS.