Category: MINERALS

MnO2, manganese Oxide A major ore of manganese and as a mineral specimen Pyrolusite is the most common manganese mineral and is an important ore. Manganese is a

(Co, Fe)AsS, cobalt arsenic Sulfide Important ore of cobalt and as mineral specimens Cobaltite although rare is still an important and valuable ore of cobalt, a strategically and

FeCO3, iron Carbonate A minor ore of iron and as mineral specimens Siderite is named for the Greek word for iron, sideros. The word siderite is used in

Fe3O4, iron Oxide Major ore of iron and as mineral specimens Magnetite is a natural magnet, hence the name, giving it a very nice distinguishing characteristic. Explaining the

FeS2, iron Sulfide A very minor ore of sulfur for sulfuric acid, used in jewellery under the trade name “marcasite” and as mineral specimens Pyrite is the classic

CaMg(CO3)2, calcium magnesium Carbonate In some cements, as a source of magnesium and as mineral specimens Dolomite, which is named for the French mineralogist Deodat de Dolomieu, is