Mineral Variety

Mineral Variety

 

individual minerals united by their most important characteristics into a single mineral species but distinguished by the existence of elements in their chemical (elemental) composition that are capable of isomorphically replacing one species-forming element or group of elements. For example, molybdoscheelite Ca[(W, Mo)O4] is a variety of scheelite Ca[Wo4]. Mineral varieties are sometimes identified by other, purely external characteristics, such as color, diaphaneity, and shape. Varieties of quartz (rock crystal, amethyst, morion, chalcedony), hematite (iron glance, red ocher), and corundum (sapphire, ruby) are identified by such external characteristics.

References in periodicals archive ?
According to the Ministry of Industry, Mine and Trade (MIMT), Iran has 62 known types of minerals and ranks 10th in the world in terms of mineral variety.
Overall, the country ranks 10th in the world for the mineral variety of its underground resources: 50 different minerals are found in economically adequate quantities, while another 27 types have been discovered but lack the quantity or quality to be commercially exploited.
Despite moves to serve up tap water across Whitehall and even in the House of Lords, the Commons will continue buying a mineral variety from Hampshire.