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

Oligoclase :: Oligoclase (n.) A triclinic soda-lime feldspar. See Feldspar.

Granulite :: Granulite (n.) A whitish, granular rock, consisting of feldspar and quartz intimately mixed; -- sometimes called whitestone, and leptynite..

Felspath :: Felspath (n.) See Feldspar.

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

Chesterlite :: Chesterlite (n.) A variety of feldspar found in crystals in the county of Chester, Pennsylvania..

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

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

Necronite :: Necronite (n.) Fetid feldspar, a mineral which, when struck, exhales a fetid odor..

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..

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..

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

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..

Adularia :: Adularia (n.) A transparent or translucent variety of common feldspar, or orthoclase, which often shows pearly opalescent reflections; -- called by lapidaries moonstone..

Gneiss :: Gneiss (n.) A crystalline rock, consisting, like granite, of quartz, feldspar, and mica, but having these materials, especially the mica, arranged in planes, so that it breaks rather easily into coarse slabs or flags. Hornblende sometimes takes the place of the mica, and it is then called hornblendic / syenitic gneiss. Similar varieties of related rocks are also called gneiss..

Sunstroke :: Sunstone (n.) Aventurine feldspar. See under Aventurine.

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..

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

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

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..

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