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ectly by the action of nitric acid on potassium ferrocyanide (yellow prussiate), as a red crystalline unstable substance. It forms salts called nitroprussides, which give a rich purple color with alkaline subphides.

A granular crystalline rock consisting essentially of a triclinic feldspar (as labradorite) and hypersthene.

leavage. Octahedral borax (Chem.), borax obtained from a saturated solution in octahedral crystals, which contain five molecules of water of crystallization; distinguished from common or prismatic borax. -- Octahedral iron ore (Min.), magnetite.

Titanium dioxide occurring in acute octahedral crystals.

getable fats and oils, such as sperm oil, olive oil, etc. At low temperatures the acid is crystalline, but melts to an oily liquid above 14

al fats (esp. beef fat) by separating the greater portion of the solid fat or stearin, by crystallization. It is mainly a mixture of olein and palmitin with some little stearin.

A white crystalline substance, obtained from an exudation from the olive, and having a bitter-sweet taste and acid proporties. [Written also olivile.] Gregory.

A white crystalline waxy substance extracted from the root of the leguminous plant Ononis spinosa.

the optic axis that objects are most distinctly seen. (b) The line in a doubly refracting crystal, in the direction of which no double refraction occurs. A uniaxial crystal has one such line, a biaxial crystal has two. -- Optical circle (Opt.), a graduated circle used for the measurement of angles in optical experimen…

A colorless crystalline substance, C6H3.CH3.(OH)2, which is obtained from certain lichens (Roccella, Lecanora, etc.), also from extract of aloes, and artificially from certain derivatives of toluene. It changes readily into orcein.

A white crystalline substance which is obtained indirectly from the root of an umbelliferous plant (Imperatoria Oreoselinum), and yields resorcin on decomposition.

t. "Pearls round and orient." Jer. Taylor. "Orient gems." Wordsworth. "Orient liquor in a crystal glass." Milton.

as to show its relation to other bodies, or the relation of its parts among themselves. A crystal is orientated when placed in its proper position so as to exhibit its symmetry. E. S. Dana.

uced artificially as an amorphous lemonyellow powder, and occurring naturally as a yellow crystalline mineral; -- formerly called auripigment. It is used in king's yellow, in white Indian fire, and in certain technical processes, as indigo printing. Our orpiment and sublimed mercurie. Chaucer. Red orpiment, realgar; th…

ignating, an organic acid obtained by a partial decomposition of orsellic acid as a white crystalline substance, and related to protocatechuic acid.

A variety of allanite occurring in slender prismatic crystals.

Common or potash feldspar crystallizing in the monoclinic system and having two cleavages at right angles to each other. See Feldspar.

The diagonal or lateral axis in a monoclinic crystal which is at right angles with the vertical axis.

Having the axes at right angles to one another; -- said of crystals or crystalline forms.

Noting the system of crystallization which has three unequal axes at right angles to each other; trimetric. See Crystallization.