complex silicates

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• lead processing — Introduction       preparation of the ore for use in various products.       Lead (Pb) is one of the oldest metals known, being one of seven metals used in the ancient world (the others are gold, silver, copper, iron, tin, and mercury). Its low… …   Universalium

• Mineral — For other uses, see Mineral (disambiguation). An assortment of minerals. A mineral is a naturally occurring …   Wikipedia

• silica mineral — Any of the forms of silicon dioxide (SiO2), including quartz, tridymite, cristobalite, coesite, stishovite, melanophlogite, lechatelierite, and chalcedony. Various kinds of silica minerals have been produced synthetically. * * * Introduction… …   Universalium

• Berzelius, Jöns Jacob — ▪ Swedish chemist Introduction born August 20, 1779, near Linköping, Sweden died August 7, 1848, Stockholm  one of the founders of modern chemistry. He is especially noted for his determination of atomic weights (atomic weight), the development… …   Universalium

• Carbon sink — A carbon sink is reservoir of carbon that accumulates and stores carbon for an indefinite period. The main natural sinks are: # Absorption of carbon dioxide by the oceans # Photosynthesis by plants and algae The process by which carbon sinks… …   Wikipedia

• scapolite — noun Etymology: French, from Latin scapus shaft + French o + lite; from the prismatic shape of its crystals Date: 1802 any of a group of minerals that are essentially complex silicates of aluminum, calcium, and sodium and that include some used… …   New Collegiate Dictionary

• pumice — Volcanic cinders ground to particles of varying sizes; used in dentistry for polishing restorations or teeth; an abrasive. [L. pumex (pumic ), a p. stone] * * * pum·ice pəm əs n a volcanic glass full of cavities and very light in weight used esp …   Medical dictionary

• mica — [mī′kə] n. [ModL < L, a crumb, grain (< IE * (s)meik , var. of base * (s)mei , to smear, rub over > OE smitte, a smudge): sense infl. by micare, to shine, glitter < IE * meik , to flicker, blink] any of a group of minerals that are… …   English World dictionary

• chemical element — Introduction also called  element,         any substance that cannot be decomposed into simpler substances by ordinary chemical processes. Elements are the fundamental materials of which all matter is composed.       This article considers the… …   Universalium

• metamorphic rock — Any of a class of rocks that result from the alteration of preexisting rocks in response to changing geological conditions, including variations in temperature, pressure, and mechanical stress. The preexisting rocks may be igneous, sedimentary,… …   Universalium

• mineral deposit — Introduction       aggregate of a mineral in an unusually high concentration.       About half of the known chemical elements (chemical element) possess some metallic (metal) properties. The term metal, however, is reserved for those chemical… …   Universalium