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

Glass-rope :: Glass-rope (n.) A remarkable vitreous sponge, of the genus Hyalonema, first brought from Japan. It has a long stem, consisting of a bundle of long and large, glassy, siliceous fibers, twisted together..

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

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

Suberone :: Suberite (n.) Any sponge of the genus Suberites and allied genera. These sponges have a fine and compact texture, and contain minute siliceous spicules..

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..

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..

Siliceous :: Siliceous (a.) Of or pertaining to silica; containing silica, or partaking of its nature..

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..

Conglomerate :: Conglomerate (n.) A rock, composed or rounded fragments of stone cemented together by another mineral substance, either calcareous, siliceous, or argillaceous; pudding stone; -- opposed to agglomerate. See Breccia..

Ventriculite :: Ventriculite (n.) Any one of numerous species of siliceous fossil sponges belonging to Ventriculites and allied genera, characteristic of the Cretaceous period..

Frustule :: Frustule (n.) The siliceous shell of a diatom. It is composed of two valves, one overlapping the other, like a pill box and its cover..

Jaspilite :: Jaspilite (n.) A compact siliceous rock resembling jasper.

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

Euplectella :: Euplectella (n.) A genus of elegant, glassy sponges, consisting of interwoven siliceous fibers, and growing in the form of a cornucopia; -- called also Venus's flower-basket..

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

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

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

Silicious :: Silicious (a.) See Siliceous.

Spongin :: Spongilla (n.) A genus of siliceous spongea found in fresh water.

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