perthite
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Perthite — is used to describe an intergrowth of two feldspars: a host grain of potassium rich alkali feldspar (near K feldspar, KAlSi3O8, in composition) includes exsolved lamellae or irregular intergrowths of sodic alkali feldspar (near albite, NaAlSi3O8 … Wikipedia
Perthite — Perth ite, n. [So called from Perth, in canada.] (Min.) A kind of feldspar consisting of a laminated intertexture of albite and orthoclase, usually of different colors. {Per*thit ic}, a. [1913 Webster] … The Collaborative International Dictionary of English
perthite — ● perthite nom féminin Cristal mixte de feldspath sodique et de feldspath potassique résultant de la démixtion à basse température d une phase cristalline sodipotassique, homogène à haute température … Encyclopédie Universelle
perthite — perthitic /peuhr thit ik/, adj. perthitically, adv. /perr thuyt/, n. Mineral a variety of feldspar containing irregular bands of albite in microcline. [1832; named after Perth, Ontario, Canada; see ITE1] * * * any member of a class of… … Universalium
perthite — perth·ite … English syllables
Perthite — /ˈpɜθaɪt/ (say perthuyt) noun 1. someone who was born in Perth, WA, or who has come to regard it as his or her home. –adjective 2. of or relating to the city of Perth, WA …
perthite — … Useful english dictionary
Perthitic — Perthite Perth ite, n. [So called from Perth, in canada.] (Min.) A kind of feldspar consisting of a laminated intertexture of albite and orthoclase, usually of different colors. {Per*thit ic}, a. [1913 Webster] … The Collaborative International Dictionary of English
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
Feldspar — is the name of a group of rock forming minerals which make up as much as 60% of the Earth s crust.Feldspar. [http://www.ima na.org/about industrial minerals/feldspar.asp What is Feldspar?] Industrial Minerals Association. Retrieved on July 18… … Wikipedia
