porphyritic rocks

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• porphyritic — adjective (of rocks) consisting of porphyry or containing large crystals in a fine groundmass of minerals • Pertains to noun: ↑porphyry • Derivationally related forms: ↑porphyry …   Useful english dictionary

• Formation of rocks — This article discusses how rocks are formed. There are also articles on physical rock formations, also known as strata, and the formal naming of geologic formations. The three main ways rocks are formed: * Sedimentary rocks are formed through the …   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

• Dacite — Aphanitic QAPF diagram denoting daci …   Wikipedia

• Lamprophyre — Lamprophyres (Greek λαµπρός (lamprós) = bright and φύρω (phýro) = to mix) are uncommon, small volume ultrapotassic igneous rocks primarily occurring as dikes, lopoliths, laccoliths, stocks and small intrusions. They are alkaline silica… …   Wikipedia

• andesite — andesitic /an deuh zit ik/, adj. /an deuh zuyt /, n. a dark colored volcanic rock composed essentially of plagioclase feldspar and one or more mafic minerals, as hornblende or biotite. [1840 50; named after ANDES; see ITE1] * * * Any member of a… …   Universalium

• Patagonia — For other uses, see Patagonia (disambiguation). Official map of cartographer of the King of Spain, Juan de la Cruz Cano y Olmedilla, 1775. Patagonia is a region located in Argentina and Chile, integrating the southernmost section of the A …   Wikipedia

• Inverary —    INVERARY, a royal burgh, the county town, and a parish, in the district and county of Argyll, 60 miles (N. W. by W.) from Glasgow, and 114 (W. N. W.) from Edinburgh; containing 2285 inhabitants, of whom 1233 are in the burgh. This place takes… …   A Topographical dictionary of Scotland

• -phyre — ˌfī(ə)r, ˌfīə noun combining form ( s) Etymology: French phyre, from porphyre porphyry, from Medieval Latin porphyrium more at porphyry : porphyritic rock aphanophyre * * * a combining form representing …   Useful english dictionary

• Joseph Carne — (1782–1858), British geologist and industrialistCarne, born at Truro, Cornwall, on 17 April 1782, was the eldest son of William Carne, a banker, and was educated at the Wesleyan school, Keynsham, near Bristol. His younger brother was John Carne.… …   Wikipedia

• -phyre — a word element used to form names of porphyritic rocks, as in granophyre. {Greek phyr, meaning porphyry} …