orthoclase feldspar
21granodiorite — Medium to coarse grained rock that is one of the most abundant intrusive rocks. It contains quartz and is distinguished from granite by having more plagioclase feldspar than orthoclase feldspar; its other mineral constituents include hornblende,… …
22latite — or trachyandesite Type of igneous rock that is abundant in western North America. Usually white, yellowish, pinkish, or gray, it is the volcanic equivalent of monzonite. Latites contain plagioclase feldspar (andesine or oligoclase) as large,… …
23theralite — /thear euh luyt /, n. a coarse grained, phaneritic rock composed of labradorite, nepheline, and augite. [ < Gk théra hunting + LITE; said to be so called because success in hunting it down was thought to be certain] * * * ▪ mineral any… …
24quartz monzonite — ▪ mineral also called adamellite intrusive igneous rock (solidified from a liquid state) that contains plagioclase feldspar, orthoclase feldspar, and quartz. It is abundant in the large batholiths (great masses of igneous rocks mostly… …
25Decomposed granite — near Font Romeu Odeillo Via. Decomposed granite, also known as DG, is granitic rock that has weathered to the point that it readily fractures into smaller pieces or chunks of weak rock. Further weathering produces rock that easily crumbles into… …
26Mohs scale of mineral hardness — The Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer material. It was created in 1812 by the German geologist and mineralogist Friedrich Mohs and… …
27Felsite — Fel site, n. [Cf. {Feldspar}.] (Min.) A finegrained rock, flintlike in fracture, consisting essentially of orthoclase feldspar with occasional grains of quartz. [1913 Webster] …
28Sanidine — San i*dine, n. [Gr. ?. ?, a board. So called in allusion to the tabular crystals.] (Min.) A variety of orthoclase feldspar common in certain eruptive rocks, as trachyte; called also {glassy feldspar}. [1913 Webster] …
29Maifan Stone — (Chn. 麦饭石 or 麥飯石), also known as bakuhanseki (Jp. 麦飯石), is a special mineral rock used in Chinese medicine to treat various skin diseases. It is composed of minerals including but not limited to plagioclase feldspar, orthoclase feldspar,… …
30essexite — ▪ rock dark gray to black, fine grained, intrusive igneous rock that occurs in Essex County, Mass.; at Mount Royal, near Montreal; near Oslo, Nor.; at Roztoky, Czech Republic; and at Carclout, Scot. It contains plagioclase as the dominant… …
