a mixed specimen of Sphalerite, Galena, Dolomite from Nenthead, Cumbria
|Mineral Group||sulphide and carbonate|
|Composition||ZnS + PbS + CaMg(CO3)2|
Sphalerite also sometimes called zincblende or blackjack it is a zinc sulfide mineral.
Galena also called lead glance, is the natural mineral form of lead(II) sulfide. It is the most important ore of lead and an important source of silver.
Dolomite is an anhydrous carbonate mineral composed of calcium magnesium carbonate.