| pebble |
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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.
verb to pebble
- To pave with pebbles.
- (curling) To deposit water droplets on the ice. e.g. to pebble the ice between games.
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| pegmatite |
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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.
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| peridotite |
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noun - (mineralogy) a rock consisting of small crystals of olivine, pyroxene and hornblende; the major constituent of the Earth's mantle
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| petrography |
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noun - (geology) the description and classification of rocks
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| phenocryst |
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noun - (mineralogy) any relatively large crystal embedded in a more fine-grained or glassy igneous rock
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| phonolite |
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noun - (mineralogy) a light-coloured rock of volcanic origin composed mostly of alkali feldspars
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| phosphorite |
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noun - (mineralogy) a sedimentary rock rich in phosphate minerals such as apatite
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| phyllite |
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noun - (geology) a type of metamorphic rock formed from clay-rich sediments called pelites
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| pitchstone |
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noun - (geology) a natural glass, that is rich in microscopic crystalites, formed by the rapid cooling of lava or magma
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| pore |
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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.
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| porphyritic |
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adjective
- of or pertaining to porphyry
- (geology) containing large crystals in a fine mass of material
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| porphyry |
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noun (wikipedia, porphyry (geology))
(porphyr, ies)
- (geology) a hard igneous rock consisting of large crystals in a fine-grained matrix
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| pumice |
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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.
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| pyroxenite |
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noun
- (geology) A heavy, dark igneous rock consisting mostly of pyroxene minerals with smaller amounts of olivine and hornblende.
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