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

Amygdaloid :: Amygdaloid (n.) A variety of trap or basaltic rock, containing small cavities, occupied, wholly or in part, by nodules or geodes of different minerals, esp. agates, quartz, calcite, and the zeolites. When the imbedded minerals are detached or removed by decomposition, it is porous, like lava..

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

Liparite :: Liparite (n.) A quartzose trachyte; rhyolite.

Tridymite :: Tridymite (n.) Pure silica, like quartz, but crystallizing in hexagonal tables. It is found in trachyte and similar rocks..

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..

Chert :: Chert (n.) An impure, massive, flintlike quartz or hornstone, of a dull color..

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..

Sagenitic :: Sagenitic (a.) Resembling sagenite; -- applied to quartz when containing acicular crystals of other minerals, most commonly rutile, also tourmaline, actinolite, and the like..

Morion :: Morion (n.) A dark variety of smoky quartz.

Quartzy :: Quartzy (a.) Quartzose.

Hornstone :: Hornstone (n.) A siliceous stone, a variety of quartz, closely resembling flint, but more brittle; -- called also chert..

Agate :: Agate (n.) A semipellucid, uncrystallized variety of quartz, presenting various tints in the same specimen. Its colors are delicately arranged in stripes or bands, or blended in clouds..

Trapezohedron :: Trapezohedron (n.) A tetartohedral solid of the hexagonal system, bounded by six trapezoidal planes. The faces of this form are common on quartz crystals..

Petuntze :: Petuntze (n.) Powdered fledspar, kaolin, or quartz, used in the manufacture of porcelain..

Garnet :: Garnet (n.) A mineral having many varieties differing in color and in their constituents, but with the same crystallization (isometric), and conforming to the same general chemical formula. The commonest color is red, the luster is vitreous, and the hardness greater than that of quartz. The dodecahedron and trapezohedron are the common forms..

Sandstone :: Sandstone (n.) A rock made of sand more or less firmly united. Common or siliceous sandstone consists mainly of quartz sand.

Quartzose :: Quartzose (a.) Containing, or resembling, quartz; partaking of the nature or qualities of quartz..

Granite :: Granite (n.) A crystalline, granular rock, consisting of quartz, feldspar, and mica, and usually of a whitish, grayish, or flesh-red color. It differs from gneiss in not having the mica in planes, and therefore in being destitute of a schistose structure..

Aventurine :: Aventurine (n.) A variety of translucent quartz, spangled throughout with scales of yellow mica..

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