Crystals, Rocks and Minerals for Sale | Fossilicious
Gold, silver, and copper are called native elements and occur in nature in relatively pure form. Most minerals are compounds or mixtures of elements. It is these compounds that make up the chemical formula and structure of minerals. For example, halite has the chemical formula is NaCl or sodium chloride. Each sodium atom is combined with one chlorine atom. The formula for Quartz is SiO2 ...