HEMATITE
HEMATITE Hematite – Fe2O3 – is a very common oxide. It is the main iron ore, as it contains approximately 70% iron. Hematite is one of several iron oxides and forms a complete solution (isomorphism) with ilmenite (FeTiO3) at temperatures above 950°C. At low temperatures there is still a very low degree of mixing with […]
HALITE
HALITE Halite – HCl – is a halide with a restricted but worldwide distribution. It has been extremely important since the Neolithic as a salt ore and later as a base for obtaining chlorine. When combined with K and Mg salts, it also forms an ore of these elements. May contain I, Br, Fe and […]