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A mineral of an olive-green color, commonly in orthorhombic crystals. It is a hydrous phosphate of copper.

A figure with four equal sides, having two acute and two obtuse angles; a rhomb.

Having the form of a lozenge or rhomb. The lozenged panes of a very small latticed window. C. Bronté.

The longer of two diagonals, as of a rhombic prism. See Crystallization.

A dome parallel to the longer lateral axis of an orthorhombic crystal. See Dome, n., 4.

One of the two planes of an orthorhombic crystal which are parallel to the vertical and longer lateral (macrodiagonal) axes.

A prism of an orthorhombic crystal between the macropinacoid and the unit prism; the corresponding pyramids are called macropyramids.

Native magnesium carbonate occurring in white compact or granular masses, and also in rhombohedral crystals.

A large British fluke, or flounder (Rhombus megastoma); -- called also carter, and whiff. marchpane.

ng chiefly of the oxides of iron and titanium. It is commonly massive, but occurs also in rhombohedral crystals. Called also titanic iron ore, and ilmenite.

d muster of the soldiers of liberty. Hawthorne. See how in warlike muster they appear, In rhombs, and wedges, and half-moons, and wings. Milton.

c forms of the species of Dicyemata, which produced vermiform embryos; -- opposed to Ant: rhombogene.

A glassy colorless mineral occurring in rhombohedral crystals, sometimes used as a gem. It is a silicate of glucina, and receives its name from its deceptive similarity to quartz.

The sailor's choice (Diplodus, or Lagodon, rhomboides).

orth America. It is common on stone walls and on the trunks of trees, and has trifoliate, rhombic-ovate, variously notched leaves. Many people are poisoned by it, if they touch the leaves. See Poison sumac. Called also poison oak, and mercury. -- Poison nut. (Bot.) (a) Nux vomica. (b) The tree which yields this seed (…

first proposed it.] (Opt.) An instrument for experiments in polarization, consisting of a rhomb of Iceland spar, which has been bisected obliquely at a certain angle, and the two parts again joined with transparent cement, so that the ordinary image produced by double refraction is thrown out of the field by total refl…

Same as Orthorhombic. Prismatic borax (Chem.), borax crystallized in the form of oblique prisms, with ten molecules of water; -- distinguished from octahedral borax. -- Prismatic colors (Opt.), the seven colors into which light is resolved when passed through a prism; primary colors. See Primary colors, under Color.…

A sulphide of arsenic and silver of a beautiful cochineal-red color, occurring in rhombohedral crystals, and also massive; ruby silver.

es. They had a compressed body, covered with dermal ribs (pleurolepida) and with enameled rhomboidal scales.

Ruby silver; dark red silver ore. It is a sulphide of antimony and silver, occurring in rhombohedral crystals or massive, and is of a dark red or black color with a metallic adamantine luster.