- pegmatite dike
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English-Russian mining dictionary. В.П. Манышев.
pegmatite dike
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Pegmatite — is a very coarse grained igneous rock that has a grain size of 20 mm or more; such rocks are referred to as pegmatitic .Most pegmatites are composed of quartz, feldspar and mica; in essence a granite . Rarer intermediate and mafic pegmatite… … Wikipedia
Dike (geology) — Banded gneiss with dike of granite orthogneiss. An intrusion (Notch Peak monzonite) inter fingers (partly as a dike … Wikipedia
Barringer Hill — is a famous geological and mineralogical site in central Texas. It lies on the former west side of the Colorado river, beneath Lake Buchanan, about convert|22|mi|km northeast of the town of Llano. The hill consists of a pegmatite and geologically … Wikipedia
Miarolitic cavities — (or miarolitic texture ) are typically crystal lined irregular cavities or vugs most commonly found in granitic pegmatites, but also found in a variety of igneous rocks. The central portions of pegmatites are often miarolitic as the pegmatite… … Wikipedia
Miarolitic cavity — Miarolitic cavities (or miarolitic texture) are typically crystal lined irregular cavities or vugs most commonly found in granitic pegmatites, but also found in a variety of igneous rocks. The central portions of pegmatites are often miarolitic… … Wikipedia
Thomasclarkite — Infobox mineral name = Thomasclarkite (Y) category = Mineral boxwidth = boxbgcolor = caption = formula = (Na,Ce)(Y,REE)(HCO3)(OH)3·4(H2O) molweight = 375.77 gm color = White, Yellow habit = Blocky crystals pseudo tetragonal system = Monoclinic… … Wikipedia
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
Precambrian time — Interval of geologic time from с 3. 8 billion years ago, the age of the oldest known rocks, to 544 million years ago, the beginning of the Cambrian Period. This interval represents more than 80% of the geologic record and thus provides important… … Universalium
Diabase — /ˈd … Wikipedia
Dacite — Aphanitic QAPF diagram denoting daci … Wikipedia
Slave craton — which is one of the oldest dated rock units on Earth at 4.03 Ga. The crust of the Slave craton is thought to have amalgamated during a 2.69 Ga collision between a proto Slave western basement complex, known as the Central Slave Basement Complex,… … Wikipedia
