Quartz-rock
71quartz|ite — «KWAWRT syt», noun. a granular rock consisting mostly of quartz and formed by the metamorphism of sandstone: »Frank L. Hess reported uranium in quartzite of pre Cambrian age very early in the century (Bulletin of Atomic Scientists) …
72rock crystal — rock′ crys tal n. mir transparent quartz, esp. when colorless • Etymology: 1660 …
73rock crystal — ► NOUN ▪ transparent quartz, typically in the form of colourless hexagonal crystals …
74rock crystal — n. a transparent, esp. colorless, quartz …
75rock crystal — quartz; a transparent form of silicon dioxide (silica), SiO2; used for lenses …
76rock — rock1 rockless, adj. rocklike, adj. /rok/, n. 1. a large mass of stone forming a hill, cliff, promontory, or the like. 2. Geol. a. mineral matter of variable composition, consolidated or unconsolidated, assembled in masses or considerable… …
77Rock — /rok/, n. a male given name. * * * I In geology, a naturally occurring and coherent aggregate of minerals. The three major classes of rock igneous, sedimentary, and metamorphic are based on the processes that formed them. These three classes are… …
78Quartz — This article is about the mineral. For other uses, see Quartz (disambiguation). Quartz Quartz crystal cluster from Tibet General Category …
79Quartz reef mining — Primary gold typically occurs in quartz veins. The extraction of gold ore from these hard quartz veins was historically referred to as quartz reef mining.A Prussian engineer, Jacob Brache was the first to think that quartz reefs might have even… …
80Quartz (metal band) — Infobox musical artist Name = Quartz Img capt = Background = group or band Alias = Origin = Birmingham, England Genre = Heavy metal Years active = 1974 1983 1996 Label = Associated acts = Black Sabbath URL = Current members = Quartz are a British …
