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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..

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

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

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

Labradorite :: Labradorite (n.) A kind of feldspar commonly showing a beautiful play of colors, and hence much used for ornamental purposes. The finest specimens come from Labrador. 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..

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..

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..

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

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

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..

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..

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

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

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.

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..

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..

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

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