| paramorphism |
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noun - (geology) a change in the physical structure of a mineral without any chemical change
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| parting |
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noun
- A farewell, the act of departing politely.
- The dividing line formed by combing the hair in different directions ; part (US)
verb
- (present participle of, part)
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| pectolite |
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noun - (mineralogy) a gray-white mineral inosilicate hydroxide of calcium and sodium that crystallizes in the triclinic system
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| pentlandite |
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noun - (mineralogy) A mixed iron and nickel sulfide mineral; the major ore of nickel.
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| perovskite |
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noun - (mineralogy) a minor accessory mineral, CaTiO?3, occuring in basic rocks, as orthorhombic crystals
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| petalite |
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noun - (mineralogy) a rare pegmatitic mineral, a lithium aluminosilicate, used in the manufacture of crystallized glass ceramics
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| phlogopite |
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noun - (mineralogy) a mica mineral, a basic potassium magnesium aluminosilicate, used as an insulator
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| pigeonite |
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noun - (mineralogy) any monoclinic pyroxene that is a mixed calcium, magnesium and ferrous silicate
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| pitchblende |
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noun - A variety of the mineral uraninite.
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| plagioclase |
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noun
- (mineralogy) A group of feldspar minerals that form a solid solution series from albite (sodium aluminum silicate) to anorthite (calcium aluminum silicate). The plagioclase feldspars are found in igneous, plutonic, and metamorphic rocks. They all have the triclinic-pinacoidal crystal habit, but only Albite commonly occurs in well crystallized specimens.
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| plumbaginous |
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adjective
- Resembling plumbago; consisting of, or containing, plumbago; as, a plumbaginous slate.
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| plumbago |
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noun - (mineralogy) graphite
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| polybasite |
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noun
- (mineralogy) An iron-black ore of silver, consisting of silver, sulphur, and antimony, with some copper and arsenic.
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| prehnite |
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noun - (mineralogy) a mineral, a basic calcium, aluminium and iron aluminosilicate, which occurs in stalagtitic aggregates or curved crystals
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| proustite |
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noun - (mineralogy) a mineral, Ag3AsS?3, often found with pyragyrite in silver veins
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| pyrargyrite |
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noun pyragyrite
- (mineralogy): Ruby silver; dark red silver ore. It is a sulphide of antimony and silver, Ag3SbS?3, occurring in rhombohedral crystals or massive, and is of a dark red or black color with a metallic adamantine luster; it is an important silver ore
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| pyrite |
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noun - A common mineral of a pale brass-yellow color and brilliant metallic luster, crystallizing in the isometric system; iron pyrites; iron disulfide.
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| pyrites |
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noun
- (plural of, pyrite)
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| pyrochlore |
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noun - (mineralogy) a mineral whose composition is that of a mixed niobate mostly of sodium, calcium and cerium
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| pyrognostics |
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noun
- (dated) The characteristics of a substance, especially of a mineral or metal salt, that are revealed by heat, especially by the use of a blowpipe and a charcoal block.
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| pyrolusite |
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noun - (mineralogy) a dark coloured mineral, consisting of manganese dioxide (MnO?2), that is an important ore of manganese
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| pyromorphite |
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noun - (mineralogy) a yellowish-green mineral, a mixed phosphate and chloride of lead, that is sometimes mined as an ore
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| pyrope |
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noun - (Mineralogy): A variety of garnet, of a poppy or blood-red color, frequently with a tinge of orange. It is used as a gem. See the Note under garnet.
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| pyrophyllite |
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noun - (mineralogy) a soft, pale aluminosilicate mineral, somewhat resembling talc
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| pyroxene |
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noun - (mineralogy) any of a group of crystalline minerals containing silicates of iron, magnesium and calcium
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| pyrrhotite |
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noun - (mineralogy) a weakly magnetic ferrous sulfide mineral, FeS?
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