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imes include slaty structure or cleavage, though the latter is usually independent of any mineral constituent, and transverse to the bedding, it having been produced by pressure.

Mineral deposits and rock masses designated with reference to their origin; as, the siliceous formation about geysers; alluvial formations; marine formations.

A kind of mineral of the spinel group.

A mineral of a nearly black color and vitreous luster, and consisting principally of the silicates of yttrium, cerium, and iron.

The mineral substance which incloses a vein; a matrix; a gangue. Gang board, or Gang plank. (Naut.) (a) A board or plank, with cleats for steps, forming a bridge by which to enter or leave a vessel. (b) A plank within or without the bulwarks of a vessel's waist, for the sentinel to walk on. -- Gang cask, a small cask…

The mineral or earthy substance associated with metallic ore.

A mineral having many varieties differing in color and in their constituents, but with the same crystallization (isometric), and conforming to the same general chemical formula. The commonest color is red, the luster is vitreous, and the hardness greater than that of quartz. The dodecahedron and trapezohedron are the c…

An amorphous mineral of apple-green color; a hydrous silicate of nickel and magnesia. It is an important ore of nickel.

A yellowish white, translucent mineral, consisting of the carbonates of lime and soda, with water.

ance like jelly. Lapis lazuli, if calcined, does not effervesce, but gelatinates with the mineral acids. Kirwan.

A lead-gray or grayish blue mineral with a metallic luster, consisting of sulphur, antimony, and lead, with a small proportion of arsenic.

A nodule of stone, containing a cavity, lined with crystals or mineral matter.

ats of the conformation of the earth's surface, of the distribution of land and water, of minerals, plants, animals, etc., and applies the principles of physics to the explanation of the diversities of climate, productions, etc. -- Political geography treats of the different countries into which earth is divided with…

The science which treats: (a) Of the structure and mineral constitution of the globe; structural geology. (b) Of its history as regards rocks, minerals, rivers, valleys, mountains, climates, life, etc.; historical geology. (c) Of the causes and methods by which its structure, features, changes, and conditions have been…

Jet, the mineral. [Obs.] Chaucer.

A mineral occurring in greenish gray six-sided prisms, having a greasy luster. It is probably a pseudomorph after elæolite.

A glairy viscous substance, which forms on the surface of certain mineral waters, or covers the sides of their inclosures; -- called also baregin.

allic luster, as the sulphide of copper, called copper glance. Glance coal, anthracite; a mineral composed chiefly of carbon. -- Glance cobalt, cobaltite, or gray cobalt. -- Glance copper, c -- Glance wood, a hard wood grown in Cuba, and used for gauging instruments, carpenters' rules, etc. McElrath.…

A mineral, consisting of the sulphates of soda and lime.

A metallic mineral having a grayish tin-white color, and containing cobalt and iron, with sulphur and arsenic.