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

Schist :: Schist (n.) Any crystalline rock having a foliated structure (see Foliation) and hence admitting of ready division into slabs or slates. The common kinds are mica schist, and hornblendic schist, consisting chiefly of quartz with mica or hornblende and often feldspar..

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

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

Orthoclastic :: Orthoclastic (a.) Breaking in directions at right angles to each other; -- said of the monoclinic feldspars.

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

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..

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..

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..

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..

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

Diorite :: Diorite (n.) An igneous, crystalline in structure, consisting essentially of a triclinic feldspar and hornblende. It includes part of what was called greenstone..

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..

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

Basalt :: Basalt (n.) A rock of igneous origin, consisting of augite and triclinic feldspar, with grains of magnetic or titanic iron, and also bottle-green particles of olivine frequently disseminated..

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

Porphyry :: Porphyry (n.) A term used somewhat loosely to designate a rock consisting of a fine-grained base (usually feldspathic) through which crystals, as of feldspar or quartz, are disseminated. There are red, purple, and green varieties, which are highly esteemed as marbles..

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..

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

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

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