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type metal. Atomic weight, 206.4. Symbol Pb (L. Plumbum). It is chiefly obtained from the mineral galena, lead sulphide.

A mineral of a yellowish or greenish white color, consisting of the sulphate and carbonate of lead; -- so called from having been first found at Leadhills, Scotland.

A lode; a limited mass of rock bearing valuable mineral.

A mineral having a glassy fracture, occurring in translucent trapezohedral crystals. It is a silicate of alumina and potash. It is found in the volcanic rocks of Italy, especially at Vesuvius.

The trapezohedron or tetragonal trisoctahedron; -- so called as being the form of the mineral leucite.

A mineral of a greenish yellow color; it is a silicate of glucina, lime, and soda with fluorine. Called also leucophanite.

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

A nearly opaque white mineral, in part identical with titanite, observed in some igneous rocks as the result of the alteration of titanic iron.

A whitish, reddish, or yellowish, transparent or translucent mineral, allied to chabazite.

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

Mineral coal retaining the texture of the wood from which it was formed, and burning with an empyreumatic odor. It is of more recent origin than the anthracite and bituminous coal of the proper coal series. Called also brown coal, wood coal.

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.

Combining forms fr. Gr. li`qos a stone; -- used chiefly in naming minerals and rocks.

A metallic element of the alkaline group, occurring in several minerals, as petalite, spodumene, lepidolite, triphylite, etc., and otherwise widely disseminated, though in small quantities.

The doctrine or science of the origin of the minerals composing the globe.

ing to the character of a rock, as derived from the nature and mode of aggregation of its mineral contents.

The science which treats of rocks, as regards their mineral constitution and classification, and their mode of occurrence in nature.

Position; situation; a place; a spot; esp., a geographical place or situation, as of a mineral or plant.

enoting a discourse, treatise, doctrine, theory, science; as, theology, geology, biology, mineralogy.

A mineral occurring in small, green, transparent, monoclinic crystals. It is a hydrous phosphate of iron.