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A grayish brown limestone, containing fossil shells, which reflect a beautiful play of colors. It is also called fire marble, from its fiery reflections.

An element obtained by reduction of its oxide, as a hard, grayish white metal, fusible with difficulty, but easily oxidized. Its ores occur abundantly in nature as the minerals pyrolusite, manganite, etc. Symbol Mn. Atomic weight 54.8.

A zeolitic mineral, grayish white or yellowish, occuring in delicate groups of crystals, also fibrous massive. It is a hydrous silicate of alumina, lime, and soda.

One who imitates or mimics, especially one who does so for sport; a copyist; a buffoon. Burke.

res. -- Music paper, paper ruled with the musical staff, for the use of composers and copyists. -- Music pen, a pen for ruling at one time the five lines of the musical staff. -- Music shell (Zoöl.), a handsomely colored marine gastropod shell (Voluta musica) found in the East Indies; -- so called because the color…

A mineral occuring at Vesuvius, in glassy agonal crystals; also elsewhere, in grayish or greenish masses having a greasy luster, as the variety elæolite. It is a silicate of aluminia, soda, and potash.

Nitrate of calcium, a substance having a grayish white color, occuring in efforescences on old walls, and in limestone caves, especially where there exists decaying animal matter.

hort horns, a black mane, and a bunch of long hair on the throat. The general color is grayish brown. [Written also neelghau, nilgau, and nylghaie.]

ive as an alloy in platinum ore, and in iridosmine. It is a hard, infusible, bluish or grayish white metal, and the heaviest substance known. Its tetroxide is used in histological experiments to stain tissues. Symbol Os. Atomic weight 191.1. Specific gravity 22.477.

A glassy volcanic rock of a grayish color and pearly luster, often having a spherulitic concretionary structure due to the curved cracks produced by contraction in cooling. See Illust. under Perlitic.

A grayish or dark green mineral, consisting essentially of magnesia (magnesium oxide), occurring in granular forms or in isometric crystals.

Light blue; grayish blue; -- a term applied to different shades at different periods. -- n.

A hydrous arsenate of lime, usually occurring in silky fibers of a white or grayish color.

A rare mineral occurring in tetragonal crystals of a white, yellow, or grayish color and adamantine luster. It is a chlorocarbonate of lead.

A compact granular cryptocrystalline mineral of a dull grayish or greenish white color. It is a hydrous alkaline silicate, and is derived from the alteration of other minerals, as iolite.

A plastic, unctuous clay of a grayish white color, -- used in making tobacco pipes and various kinds of earthenware, in scouring cloth, and in cleansing soldiers' equipments.

A natural alloy of platinum and iridium occurring in grayish metallic rounded or cubical grains with platinum.

An American butterfly (Polygonia, or Vanessa, Progne). It is orange and black above, grayish beneath, with an L-shaped silver mark on the hind wings. Called also gray comma.

Boyish; childish; trifling; silly. The French have been notorious through generations for their puerile affectation of Roman forms, models, and historic precedents. De Quincey.

One who holds the principles of Puseyism; -- often used opprobriously.