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Orthoclase :: Orthoclase (n.) Common or potash feldspar crystallizing in the monoclinic system and having two cleavages at right angles to each other. See Feldspar.

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..

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

Saussurite :: Saussurite (n.) A tough, compact mineral, of a white, greenish, or grayish color. It is near zoisite in composition, and in part, at least, has been produced by the alteration of feldspar..

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

Miascite :: Miascite (n.) A granitoid rock containing feldspar, biotite, elaeolite, and sodalite..

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

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..

Kaolinization :: Kaolinization (n.) The process by which feldspar is changed into kaolin.

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..

Stinkweed :: Stinkstone (n.) One of the varieties of calcite, barite, and feldspar, which emit a fetid odor on being struck; -- called also swinestone..

Lath-shaped :: Lath-shaped (a.) Having a slender elongated form, like a lath; -- said of the feldspar of certain igneous rocks, as diabase, as seen in microscopic sections..

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

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

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

Andesine :: Andesine (n.) A kind of triclinic feldspar found in the Andes.

Andesite :: Andesite (n.) An eruptive rock allied to trachyte, consisting essentially of a triclinic feldspar, with pyroxene, hornblende, or hypersthene..

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

Porphyritic :: Porphyritic (a.) Relating to, or resembling, porphyry, that is, characterized by the presence of distinct crystals, as of feldspar, quartz, or augite, in a relatively fine-grained base, often aphanitic or cryptocrystalline..

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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