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 ?
Quantitative analysis of amphiboles using the Rietveld method was more accurate when using the atom coordinates of the same or a similar mineral variety. We searched databases for amphibole varieties with lattice parameters similar to those of the Lemme amphiboles, and found that Mg-hornblende from southwestern Finland was the closest (Mancini et al.
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. In addition, the country has 37 billion tons of proven reserves and 57 billion tons of potential reserves, and ranks 15th in the world in terms of quantity of mineral substances.
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.