hydrous micas

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• hydrous mica — ▪ mineral also called  hydromica        any of the illite group of clay minerals, including illite, bramallite (a sodium illite), and glauconite. They are structurally related to the micas; glauconite is also a member of the common mica group.… …   Universalium

• mica — micalike, adj. /muy keuh/, n. any member of a group of minerals, hydrous silicates of aluminum with other bases, chiefly potassium, magnesium, iron, and lithium, that separate readily into thin, tough, often transparent, and usually elastic… …   Universalium

• clay mineral — any of a group of hydrous aluminum silicate minerals, as kaolinite, illite, and montmorillonite, that constitute the major portion of most clays. [1945 50] * * * Any of a group of important hydrous aluminum silicates with a layered structure and… …   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

• igneous rock — Any of various crystalline or glassy, noncrystalline rocks formed by the cooling and solidification of molten earth material (magma). Igneous rocks comprise one of the three principal classes of rocks, the others being metamorphic and sedimentary …   Universalium

• Groupe des chlorites — Pour les articles homonymes, voir chlorite (homonymie). Groupe des chlorites Catégorie IX : silicates[1] …   Wikipédia en Français

• chlorite — chlorite1 chloritic /klaw rit ik, kloh /, adj. /klawr uyt, klohr /, n. a group of minerals, hydrous silicates of aluminum, ferrous iron, and magnesium, occurring in green platelike crystals or scales. [1595 1605; CHLOR 1 + ITE1] chlorite2 /klawr… …   Universalium

• amphibole — /am feuh bohl /, n. Mineral. any of a complex group of hydrous silicate minerals, containing chiefly calcium, magnesium, sodium, iron, and aluminum, and including hornblende, tremolite, asbestos, etc., occurring as important constituents of many… …   Universalium

• Clay minerals — Oxford Clay (Jurassic) exposed near Weymouth, England. Clay minerals are hydrous aluminium phyllosilicates, sometimes with variable amounts of iron, magnesium, alkali metals, alkaline earths, and other cations. Clays have structures similar to… …   Wikipedia

• Tschermakite — The endmember hornblende Tschermakite Ca2(Mg,Fe2+)3Al2(Si6Al2)O22(OH)2 is a calcium rich monoclinic amphibole mineral. It is frequently synthesized along with its ternary solid solution series members Tremolite and Cummingtonite so that the… …   Wikipedia

• Chloritisation — La chloritisation est un processus de dégradation des roches magmatiques (granitiques ou volcaniques) au cours duquel il y remplacement du potassium par de l aluminium chez les micas au contact de l oxygène. On observe alors la formation de… …   Wikipédia en Français