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Of or pertaining to silica; containing silica, or partaking of its nature. [Written also silisious.]

Consisting of, or containing calcareous and siliceous earths.

open-hearth process in which the converter or hearth is lined with acid, that is, highly siliceous, material. Opposed to basic process.

A peculiar small siliceous spicule having a denticulated wheel at each end; -- found in freshwater sponges.

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

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.

A Bessemer or open-hearth steel-making process in which a lining that is basic, or not siliceous, is used, and additions of basic material are made to the molten charge during treatment. Opposed to acid process, above. Called also Thomas process.

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

asteboard, made with a smooth but usually unglazed surface. -- Bristol brick, a brick of siliceous matter used for polishing cultery; -- originally manufactured at Bristol. -- Bristol stone, rock crystal, or brilliant crystals of quartz, found in the mountain limestone near Bristol, and used in making ornaments, vase…

ucceeding the Cambrian period. The name alludes to the peculiar mixture of calcareous and siliceous characteristics in many of the beds. See the Diagram under Grology.

ded fragments of stone cemented together by another mineral substance, either calcareous, siliceous, or argillaceous; pudding stone; -- opposed to agglomerate. See Breccia. A conglomerate, therefore, is simply gravel bound together by a cement. Lyell.

wn 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). The deposit already formed affording to the succeeding portion of the charged fluid a basis. Kirwan.…

One of the Diatomaceæ, a family of minute unicellular Algæ having a siliceous covering of great delicacy, each individual multiplying by spontaneous division. By some authors diatoms are called Bacillariæ, but this word is not in general use.

Dutch rush (Bot.), a species of horsetail rush or Equisetum (E. hyemale) having a rough, siliceous surface, and used for scouring and polishing; -- called also scouring rush, and shave grass. See Equisetum. -- Dutch tile, a glazed and painted ornamental tile, formerly much exported, and used in the jambs of chimneys…

ence the name; afterwards prepared from sea water; but now from certain minerals, as from siliceous hydrate of magnesia.

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.

brick, capable of sustaining intense heat without fusion, usually made of fire clay or of siliceous material, with some cementing substance, and used for lining fire boxes, etc. -- Fire brigade, an organized body of men for extinguished fires. -- Fire bucket. See under Bucket. -- Fire bug, an incendiary; one who, fr…

ks, which gave light, but did not inflame the fire damp. Knight. -- Flint stone, a hard, siliceous stone; a flint. -- Flint wall, a kind of wall, common in England, on the face of which are exposed the black surfaces of broken flints set in the mortar, with quions of masonry. -- Liquor of flints, a solution of silic…

ling, flint; as, a flinty rock; flinty ground; a flinty heart. Flinty rockFlinty state, a siliceous slate; -- basanite is here included. See Basanite.

ial found on the surface, away from the vein outcrop. Raymond. -- Float stone (Arch.), a siliceous stone used to rub stonework or brickwork to a smooth surface. -- Float valve, a valve or cock acted upon by a float. See Float, 1 (b).