Groups

Subgroups

Morphology and texture of particles

1) Alumino-silicate

Oxide of silica-aluminium whit trace Na-Ca

Irregular

2) Cl-Na rich

Sodium chloride

Crystals tabular

3) Sulfates

Calcium sulfate

Simmetrical, elongated and irregular

4) Metals

Pb, Cu, Cr and Fe oxide and sulphate

Irregular and spheroidal

5) Ba-rich

barite (BaSO₄)

Edges defined

6) Uranium

Oxides and carbonates of uranium

Irregular outlying edges and fracture lines