There are several types of feldspars: most deposits offer sodium feldspar, potassium feldspar and mixed feldspars. Properties Feldspars are aluminosilicates. Their fusibility and purity make them a useful raw material with many industrial applications. The geological context specific to each


Talc is the world’s softest mineral. Talc is a hydrated magnesium sheet silicate with the chemical formula Mg3Si4O10(OH)2. The elementary sheet is composed of a layer of magnesium-oxygen/hydroxyl octahedra, sandwiched between two layers of siliconoxygen tetrahedra. The main or basal surfaces