felspar
111hyalophane — /haɪˈæləfeɪn/ (say huy aluhfayn) noun a rare form of felspar containing some barium; occurs in colourless crystals in dolomite. {hyalo + phane} …
112labradorite — /læbrəˈdɔraɪt/ (say labruh dawruyt) noun a mineral of the plagioclase felspar group, often characterised by a brilliant change of colours with blue and green most common. {from Labrador + ite1} …
113microcline — /ˈmaɪkroʊˌklaɪn/ (say muykroh.kluyn) noun a mineral of the felspar group, potassium aluminium silicate, KAlSi3O8, identical in composition with orthoclase but differing in crystal system, used in making porcelain. {German Mikroklin, from Greek… …
114mineral — /ˈmɪnərəl / (say minuhruhl), /ˈmɪnrəl / (say minruhl) noun 1. a substance obtained by mining; ore. 2. any of a class of substances occurring in nature, usually comprising inorganic substances (as quartz, felspar, etc.) of definite chemical… …
115moonstone — /ˈmunstoʊn / (say moohnstohn) noun a white translucent variety of felspar with a bluish pearly lustre, used as a gem …
116nephelinite — /ˈnɛfələnaɪt/ (say nefuhluhnuyt) noun a fine grained, dark rock of volcanic origin, essentially a basalt containing nepheline but no felspar and little or no olivine. {nephelin(e) + ite1} …
117oligoclase — /ˈɒləgoʊkleɪz/ (say oluhgohklayz), / eɪs/ (say ays) noun a kind of plagioclase felspar occurring commonly in crystals of white colour, sometimes shaded with grey, green, or red. {oligo + Greek klasis fracture} …
118ophitic — /ɒˈfɪtɪk/ (say o fitik) adjective denoting or relating to a rock texture exhibited by certain ophites (diabases), in which elongate felspar crystals are embedded in a matrix of pyroxenes …
119orthoclase — /ˈɔθoʊklæs / (say awthohklas), /ˈɔθəkleɪz / (say awthuhklayz) noun a very common mineral of the felspar group, potassium aluminium silicate, KAlSi3O8, occurring as an important constituent in many igneous rocks; used in the manufacture of… …
120peridotite — /pɛriˈdoʊtaɪt/ (say peree dohtuyt) noun any of a group of igneous rocks of granitic texture, composed chiefly of olivine with an admixture of various other minerals, but nearly or wholly free from felspar …
