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Hyalonema :: Hyalonema (n.) A genus of hexactinelline sponges, having a long stem composed of very long, slender, transparent, siliceous fibres twisted together like the strands of a color. The stem of the Japanese species (H. Sieboldii), called glass-rope, has long been in use as an ornament. See Glass-rope..

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)..

Diatom :: Diatom (n.) One of the Diatomaceae, a family of minute unicellular Algae having a siliceous covering of great delicacy, each individual multiplying by spontaneous division. By some authors diatoms are called Bacillariae, but this word is not in general use..

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

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

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..

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

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

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

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..

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..

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..

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

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

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

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..

Argentine :: Argentine (n.) A siliceous variety of calcite, or carbonate of lime, having a silvery-white, pearly luster, and a waving or curved lamellar structure..

Spiculispongiae :: Spiculispongiae (n. pl.) A division of sponges including those which have independent siliceous spicules.

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

Silicious :: Silicious (a.) See Siliceous.

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