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noun
- A small stone
- (geology) A rock fragment between 4 and 64 millimetres in diameter (especially a naturally rounded one)
- (curling) A small droplet of water intentionally sprayed on the ice that cause irregularities on the surface.
verbto pebble
- To pave with pebbles.
- (curling) To deposit water droplets on the ice. e.g. to pebble the ice between games.
noun
- A coarsely crystalline igneous or plutonic rock composed primarily of feldspar and quartz, normally with muscovite and/or biotite mica. Often contains other minerals, which may be of economic importance. Pegmatite is chemically identical to granite, but has a much coarser crystal structure. Common colors are gray, white, and pink. Pegmatite is quarried for decorative stone and as a source of
beryllium, columbium and tantalum when these are present. Gemstones of the quartz/silicate family may also be found in pegmatites.
noun
- (mineralogy) a rock consisting of small crystals of olivine, pyroxene and hornblende; the major constituent of the Earth's mantle
noun
- (geology) the description and classification of rocks
noun
- (mineralogy) any relatively large crystal embedded in a more fine-grained or glassy igneous rock
noun
- (mineralogy) a light-coloured rock of volcanic origin composed mostly of alkali feldspars
noun
- (mineralogy) a sedimentary rock rich in phosphate minerals such as apatite
noun
- (geology) a type of metamorphic rock formed from clay-rich sediments called pelites
noun
- (geology) a natural glass, that is rich in microscopic crystalites, formed by the rapid cooling of lava or magma
noun
- a tiny opening in the skin
- by extension any small opening or interstice, especially one of many or allowing passage of a fluid.
verb (por, ing)
- to study meticulously; to go over again and again.
- to meditate or reflect in a steady way.
adjective
- of or pertaining to porphyry
- (geology) containing large crystals in a fine mass of material
noun (wikipedia, porphyry (geology))
(porphyr, ies)
- (geology) a hard igneous rock consisting of large crystals in a fine-grained matrix
noun
- A light, porous type of pyroclastic igneous rock, formed during explosive volcanic eruptions when liquid lava is ejected into the air as a froth containing masses of gas bubbles. As the lava solidifies, the bubbles are frozen into the rock.
noun
- (geology) A heavy, dark igneous rock consisting mostly of pyroxene minerals with smaller amounts of olivine and hornblende.
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