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A form of silica, or silicon dioxide (SiO2), occurring in hexagonal crystals, which are commonly colorless and transparent, but sometimes also yellow, brown, purple, green, and of other colors; also in cryptocrystalline massive forms varying in color and degree of transparency, being sometimes opaque.…

Manganese spar, or silicate of manganese, a mineral occuring crystallised and in rose-red masses. It is often used as an ornamental stone.

eral of a green color and micaceous structure, belonging to the chlorite group; a hydrous silicate of alumina, magnesia, and iron; -- called also clinochlore.

A green micaceous mineral occurring in minute scales. It is essentially a silicate of aluminia and potash containing vanadium.

A hydrous silicate of magnesia and aluminia. It occurs in soft, soapy, amorphous masses, filling veins in serpentine and cavities in trap rock.

white mineral occuring in tetragonal crystals and in cleavable masses. It is esentially a silicate of aluminia and soda.

zeolitic mineral occuring in delicate radiating groups of white crystals. It is a hydrous silicate of aluminia and lime. Called also lime mesotype.

A mineral or rock consisting chiefly of the hydrous silicate of magnesia. It is usually of an obscure green color, often with a spotted or mottled appearance resembling a serpent's skin. Precious, or noble, serpentine is translucent and of a rich oil-green color.

To convert (a magnesian silicate) into serpentine. -- Ser`pen*tin`i*za"tion, n.

Silica, SiO2 as found in nature, constituting quarz, and most sands and sandstones. See Silica, and Silicic.

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

Pertaining to, derived from, or resembling, silica; specifically, designating compounds of silicon; as, silicic acid. Silicic acid (Chem.), an amorphous gelatinous substance, Si(HO)4, very unstable and easily dried to silica, but forming many stable salts; -- called also orthosilicic, or normal silicic, acid.…

Consisting of silica and calcareous matter.

Producing silica; united with silica.

Thae act or process of combining or impregnating with silicon or silica; the state of being so combined or impregnated; as, the silicification of wood.

Combined or impregnated with silicon or silica, especially the latter; as, silicified wood.

To convert into, or to impregnate with, silica, or with the compounds of silicon. The specimens found . . . are completely silicified. Say.

A fluosilicate; a salt of silicofluoric acid.

morphous powder, or as a dark crystalline substance with a meetallic luster. Its oxide is silica, or common quartz, and in this form, or as silicates, it is, next to oxygen, the most abundant element of the earth's crust. Silicon is characteristically the element of the mineral kingdom, as carbon is of the organic worl…

alternating beds of the coal measures, consisting of an infusible compound of alumina and silica, and often used for making fire bricks. Tomlinson. -- Slate globe, a globe the surface of which is made of an artificial slatelike material. -- Slate pencil, a pencil of slate, or of soapstone, used for writing on a slate…