Explanation

It is not an independent mineral, but a collection of subdivided scattered minerals, consisting of gibbsite, diaspore, boehmite, hematite, clay mineral, SiO2 colloid and other minerals. In addition, rare elements such as Ga, Nb, Ta, Ti, Zr are also present in the composition. It is often in the form of dense blocks, oolites, or beans. The colors are variable, with gray, yellow gray, brownish red, and black gray visible. Matte. It is the product of weathering of rock with more aluminum under humid and hot conditions, or formed by colloid precipitation. It is the main raw mineral material for extracting aluminum and the main raw material for extracting gallium.

Classification