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A mineral of a color between white and steel-gray, with a metallic luster, and consisting chiefly of arsenic and iron.

hat of the flower of the purplish lilac. California lilac (Bot.), a low shrub with dense clusters of purplish flowers (Ceanothus thyrsiflorus).

A mineral of pale steel-gray color and metallic luster, occurring in isometric crystals, and also massive. It is a sulphide of cobalt containing some nickel or copper.

The spikelet or flower cluster of grasses. Gray.

of the Japanese medlar (Photinia Japonica). It is as large as a small plum, but grows in clusters, and contains four or five large seeds. Also, the tree itself.

ys cæca), inhabiting the sandy shores of Europe and America. It is whitish, with a pearly luster, and grows to the length of eight or ten inches.

Same as Luster.

iron (Fe3O4) occurring in isometric crystals, also massive, of a black color and metallic luster. It is readily attracted by a magnet and sometimes possesses polarity, being then called loadstone. It is an important iron ore. Called also magnetic iron.

, etc., with reddish smooth bark, ovate or oval coriaceous evergreen leaves, and bearing clusters of red berries, which are said to be a favorite food of the grizzly bear.

A mineral related to the micas, but low in silica and yielding brittle folia with pearly luster.

A dull, lusterless surface in certain of the arts, as gilding, metal work, glassmaking, etc.

. Tennyson. Italian may (Bot.), a shrubby species of Spiræa (S. hypericifolia) with many clusters of small white flowers along the slender branches. -- May apple (Bot.), the fruit of an American plant (Podophyllum peltatum). Also, the plant itself (popularly called mandrake), which has two lobed leaves, and bears a si…

A hydrous sulphate of iron of a green color and vitreous luster; iron vitriol.

rmint, spearmint, etc. The plants have small flowers, usually arranged in dense axillary clusters.

f dyes. If the yarn or cloth is kept under tension during the process, it assumes a silky luster. -- Mer`cer*i*za"tion (#), n.

A rare mineral of resinous luster and high specific gravity. It is a tantalate of calcium, and occurs in octahedral crystals usually very minute.

The lower classes of a community; the populace, or the lowest part of it. A cluster of mob were making themselves merry with their betters. Addison.

American butterflies, of the genus Morpho. They are noted for the very brilliant metallic luster and bright colors (often blue) of the upper surface of the wings. The lower surface is usually brown or gray, with eyelike spots.

nches of red berries. Its leaves are pinnate, and its flowers white, growing in fragrant clusters. The European species is the P. aucuparia, or rowan tree. -- Mountain barometer, a portable barometer, adapted for safe transportation, used in measuring the heights of mountains. -- Mountain beaver (Zoöl.), the sewellel…

A mineral of blackish lead-gray color and metallic luster, generally of a foliated massive structure; foliated tellurium. It is a telluride of lead and gold.