Search the Dictionary

id constituent, and from the seeds of many plants. From the latter it can be separated in crystalline form.

- Red vitriol, a native sulphate of cobalt. -- Vitriol of Mars, ferric sulphate, a white crystalline substance which dissolves in water, forming a red solution. -- White vitriol, zinc sulphate, a white crystalline substance used in medicine and in dyeing. It is usually obtained by dissolving zinc in sulphuric acid, o…

ate of iron of a blue to green color, growing darker on exposure. It occurs in monoclinic crystals, also fibrous, massive, and earthy.

A mineral occurring in small six-sided tabular crystals of a green or yellow color. It is a hydrous vanadate of copper and lime.

rom, or designating, an acid obtained from a lichen (Cetraria vulpina) as a yellow or red crystalline substance which on decomposition yields pulvinic acid.

A fluophosphate of magnesia, occurring in yellowish crystals, and also in massive forms.

A dark brown or black mineral, occurring in prismatic crystals imbedded in limestone near Warwick, New York. It consists of the borate and titanate of magnesia and iron.

) A concavo-convex glass for covering the face, or dial, of a watch; -- also called watch crystal. (b) (Naut.) A half- hour glass used to measure the time of a watch on deck.(Chem.) A round concavo-convex glass of shallow depth used for certain manipulations of chemicals in a laboratory. -- Watch guard, a chain or cor…

hich, upon certain hypotheses, is the locus of a wave surface of light in the interior of crystals. It is used in explaining the phenomena of double refraction. See under Refraction. -- Wave theory. (Physics) See Undulatory theory, under Undulatory.

rriage. -- Wheel ore (Min.), a variety of bournonite so named from the shape of its twin crystals. See Bournonite. -- Wheel pit (Steam Engine), a pit in the ground, in which the lower part of the fly wheel runs. -- Wheel plow, or Wheel plough, a plow having one or two wheels attached, to render it more steady, and t…

Calcium oxalate, occurring in colorless or white monoclinic crystals.

licate of zinc, usually occurring massive and of a greenish yellow color, also in reddish crystals (troostite) containing manganese.

Barium carbonate occurring in white or gray six-sided twin crystals, and also in columnar or granular masses.

r, submetallic luster, and high specific gravity. It occurs in cleavable masses, and also crystallized. Called also wolfram.

to gray, red, or yellow color, occurring generally in cleavable masses, rarely in tabular crystals; tabular spar.

East Indian apocynaceous tree (Wrightia antidysenterica), and extracted as a bitter white crystalline substance. It was formerly used as a remedy for diarrhoea. Called also conessine, and neriine.

Native lead molybdate occurring in tetragonal crystals, usually tabular, and of a bright orange-yellow to red, gray, or brown color; -- also called yellow lead ore.

An amido derivative of xanthic acid obtained as a white crystalline substance, C2H5O.CS.NH2; -- called also xanthogen amide.

alkaloids found in the root of the yellow puccoon (Hydrastis Canadensis). It is a yellow crystalline substance, and resembles berberine.

A glucoside extracted from Persian berries as a yellow crystalline powder, used as a dyestuff.