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Felsite :: Felsite (n.) A finegrained rock, flintlike in fracture, consisting essentially of orthoclase feldspar with occasional grains of quartz..

Amazon Stone :: Amazon stone (n.) A variety of feldspar, having a verdigris-green color..

Feldspathose :: Feldspathose (a.) Pertaining to, or consisting of, feldspar..

Plagioclase :: Plagioclase (n.) A general term used of any triclinic feldspar. See the Note under Feldspar.

Feldspar :: Feldspar (n.) Alt. of Feldspat.

Trachyte :: Trachyte (n.) An igneous rock, usually light gray in color and breaking with a rough surface. It consists chiefly of orthoclase feldspar with sometimes hornblende and mica..

Moonstone :: Moonstone (n.) A nearly pellucid variety of feldspar, showing pearly or opaline reflections from within. It is used as a gem. The best specimens come from Ceylon..

Element :: Element (n.) One of the ultimate parts which are variously combined in anything; as, letters are the elements of written language; hence, also, a simple portion of that which is complex, as a shaft, lever, wheel, or any simple part in a machine; one of the essential ingredients of any mixture; a constituent part; as, quartz, feldspar, and mica are the elements of granite..

Sanidine :: Sanidine (n.) A variety of orthoclase feldspar common in certain eruptive rocks, as trachyte; -- called also glassy feldspar..

Albite :: Albite (n.) A mineral of the feldspar family, triclinic in crystallization, and in composition a silicate of alumina and soda. It is a common constituent of granite and of various igneous rocks. See Feldspar..

Dolerite :: Dolerite (n.) A dark-colored, basic, igneous rock, composed essentially of pyroxene and a triclinic feldspar with magnetic iron. By many authors it is considered equivalent to a coarse-grained basalt..

Microcline :: Microcline (n.) A mineral of the feldspar group, like orthoclase or common feldspar in composition, but triclinic in form..

Diabase :: Diabase (n.) A basic, dark-colored, holocrystalline, igneous rock, consisting essentially of a triclinic feldspar and pyroxene with magnetic iron; -- often limited to rocks pretertiary in age. It includes part of what was early called greenstone..

Aphanite :: Aphanite (n.) A very compact, dark-colored /ock, consisting of hornblende, or pyroxene, and feldspar, but neither of them in perceptible grains..

Anorthite :: Anorthite (n.) A mineral of the feldspar family, commonly occurring in small glassy crystals, also a constituent of some igneous rocks. It is a lime feldspar. See Feldspar..

Kaoline :: Kaoline (n.) A very pure white clay, ordinarily in the form of an impalpable powder, and used to form the paste of porcelain; China clay; porcelain clay. It is chiefly derived from the decomposition of common feldspar..

Hyalophane :: Hyalophane (n.) A species of the feldspar group containing barium. See Feldspar.

Norite :: Norite (n.) A granular crystalline rock consisting essentially of a triclinic feldspar (as labradorite) and hypersthene.

Syenite :: Syenite (n.) Orig., a rock composed of quartz, hornblende, and feldspar, anciently quarried at Syene, in Upper Egypt, and now called granite..

Gtraystone :: Gtraystone (n.) A grayish or greenish compact rock, composed of feldspar and augite, and allied to basalt..

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