orthoclase-porphyry

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• Porphyry copper deposit — Porphyry copper deposits are copper orebodies which are associated with porphyritic intrusive rocks and the fluids that accompany them during the transition and cooling from magma to rock. Circulating surface water or underground fluids may… …   Wikipedia

• Quartz-porphyry — Quartz porphyry, in petrology, is the name given to a group of hemi crystalline acid rocks containing porphyritic crystals of quartz in a fine grained matrix, usually of micro crystalline or felsitic structure. In specimens, the quartz appears as …   Wikipedia

• quartz porphyry — noun : a porphyritic extrusive or dike rock in which quartz with more or less corroded crystals and orthoclase and usually mica, amphibole, or pyroxene occur as phenocrysts in a groundmass that is felsophyric, granophyric, or vitrophyric …   Useful english dictionary

• Trachyte — is an igneous, volcanic rock with an aphanitic to porphyritic texture. The mineral assemblage consists of essential alkali feldspar; relatively minor plagioclase and quartz or a feldspathoid such as nepheline may also be present. (See the QAPF… …   Wikipedia

• orthophyre — orˈthophyre / fīr/ noun (orthoclase porphyry) a fine grained syenitic rock with orthoclase crystals • • • Main Entry: ↑ortho …   Useful english dictionary

• Ортофир — палеотипный трахитовый порфир (бескварцевый), у которого порфировые выделения представлены калиевыми полевыми шпатами (ортоклазом и др.), присутствующими иногда вместе с плагиоклазом. По хим. составу соответствует трахиту, причем К преобладает… …   Геологическая энциклопедия

• feldspar — /feld spahr , fel /, n. any of a group of minerals, principally aluminosilicates of potassium, sodium, and calcium, characterized by two cleavages at nearly right angles: one of the most important constituents of igneous rocks. Also, felspar.… …   Universalium

• Geology of Jersey — The geology of Jersey is characterised by the Late Proterozoic Brioverian volcanics, the Cadomian Orogeny, and only small signs of later deposits from the Cambrian and Quaternary periods. The kind of rocks go from conglomerate to shale, volcanic …   Wikipedia

• Oligoclase — from Chihuahua, Mexico General Category plagioclase, feldspar, tectosilicate …   Wikipedia

• Quartz monzonite — Igneous Rock Quartz monzonite bedrock from a UGSG drill core at Western Cape Cod, Massachusetts Quartz monzonite (or adamellite) is an intrusive igneous rock that has an approximately equal proportion of orthoclase and …   Wikipedia

• Granite — For other uses, see Granite (disambiguation). Granite Igneous Rock Granite containing potassium feldspar, plagioclase feldspar, quartz, and biotite and/or amphibole Composi …   Wikipedia