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Kieselguhr :: Kieselguhr (n.) Siliceous earth; specifically, porous infusorial earth, used as an absorbent of nitroglycerin in the manufacture of dynamite..

Spicule :: Spicule (n.) Any small calcareous or siliceous body found in the tissues of various invertebrate animals, especially in sponges and in most Alcyonaria..

Hyalospongia :: Hyalospongia (n. pl.) An order of vitreous sponges, having glassy six-rayed, siliceous spicules; -- called also Hexactinellinae..

Trichite :: Trichite (n.) A delicate, hairlike siliceous spicule, found in certain sponges..

Silicious :: Silicious (a.) See Siliceous.

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

Salt :: salt () Sulphate of magnesia having cathartic qualities; -- originally prepared by boiling down the mineral waters at Epsom, England, -- whence the name; afterwards prepared from sea water; but now from certain minerals, as from siliceous hydrate of magnesia..

Basanite :: Basanite (n.) Lydian stone, or black jasper, a variety of siliceous or flinty slate, of a grayish or bluish black color. It is employed to test the purity of gold, the amount of alloy being indicated by the color left on the stone when rubbed by the metal..

Bloodstone :: Bloodstone (n.) A green siliceous stone sprinkled with red jasper, as if with blood; hence the name; -- called also heliotrope..

Itacolumite :: Itacolumite (n.) A laminated, granular, siliceous rocks, often occurring in regions where the diamond is found..

Tetractinellida :: Tetractinellida (n. pl.) A division of Spongiae in which the spicules are siliceous and have four branches diverging at right angles. Called also Tetractinellinae.

Amphidisc :: Amphidisc (n.) A peculiar small siliceous spicule having a denticulated wheel at each end; -- found in freshwater sponges.

Novaculite :: Novaculite (n.) A variety of siliceous slate, of which hones are made; razor stone; Turkey stone; hone stone; whet slate..

Radiolaria :: Radiolaria (n. pl.) Order of rhizopods, usually having a siliceous skeleton, or shell, and sometimes radiating spicules. The pseudopodia project from the body like rays. It includes the polycystines. See Polycystina..

Gannister :: Gannister (n.) A refractory material consisting of crushed or ground siliceous stone, mixed with fire clay; -- used for lining Bessemer converters; also used for macadamizing roads..

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

Tiger-eye :: Tiger-eye (n.) A siliceous stone of a yellow color and chatoyant luster, obtained in South Africa and much used for ornament. It is an altered form of the mineral crocidolite. See Crocidolite..

Deposit :: Deposit (v. t.) That which is deposited, or laid or thrown down; as, a deposit in a flue; especially, matter precipitated from a solution (as the siliceous deposits of hot springs), or that which is mechanically deposited (as the mud, gravel, etc., deposits of a river)..

Formation :: Formation (n.) Mineral deposits and rock masses designated with reference to their origin; as, the siliceous formation about geysers; alluvial formations; marine formations..

Tripoli :: Tripoli (n.) An earthy substance originally brought from Tripoli, used in polishing stones and metals. It consists almost wholly of the siliceous shells of diatoms..

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