Quartz-rock
101quartz — /kwɔts / (say kwawts) noun 1. one of the commonest minerals, silicon dioxide, SiO2, having many varieties which differ in colour, lustre, etc., occurring in crystals (rock crystal, amethyst, citrine, etc.) or massive (agate, bloodstone,… …
102quartz-diorite — A coarse grained holo crystalline igneous rock of intermediate composition, composed of quartz, plagioclase feldspar, hornblende and biotite, and thus intermediate in mineral composition between typical diorite and granite …
103quartz porphyry — A medium grained igneous rock of granitic composition occurring normally as minor intrusions, and carrying prominent phenocrysts of quartz …
104quartz porphyry — noun : a porphyritic extrusive or dike rock in which quartz with more or less corroded crystals and orthoclase and usually mica, amphibole, or pyroxene occur as phenocrysts in a groundmass that is felsophyric, granophyric, or vitrophyric …
105quartz schist — noun : a metamorphosed schistose rock composed essentially of quartz often with some mica or tourmaline or both …
106rock garden — 1. a garden on rocky ground or among rocks, for the growing of alpine or other plants. 2. a garden decorated with rocks, usually a wide variety of interestingly shaped, multicolored rocks, esp. quartz. Also called rockery. [1830 40] * * * …
107quartz arenite — variety of the rock quartzite (q.v.) formed by deposition of silica in subterranean sandstone. * * * …
108rock crystal — noun transparent quartz, typically in the form of colourless hexagonal crystals …
109rock-crystal — n. Limpid quartz, mountain crystal …
110rock-crystal — noun (U) pure natural quartz (=a very hard mineral) that is transparent …
