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riodic law, and subsequently discovered by spectrum analysis in certain rare Scandinavian minerals (euxenite and gadolinite). It has not yet been isolated. Symbol Sc. Atomic weight 44

A grayish white mineral occuring in tetragonal crystals and in cleavable masses. It is esentially a silicate of aluminia and soda.

Calcium tungstate, a mineral of a white or pale yellowish color and of the tetragonal system of crystallization.

The peculiar bronzelike luster observed in certain minerals, as hypersthene, schiller spar, etc. It is due to the presence of minute inclusions in parallel position, and in sometimes of secondary origin. Schiller spar (Min.), an altered variety of enstatite, exhibiting, in certain positions, a bronzelike luster.…

The act or process of producing schiller in a mineral mass.

A mineral occurring in steel-gray flexible folia. It contains iron, nickel, and phosphorus, and is found only in meteoric iron.

An instrument for determining with accuracy the degree of hardness of a mineral.

A zeolitic mineral occuring in delicate radiating groups of white crystals. It is a hydrous silicate of aluminia and lime. Called also lime mesotype.

A leek-green or brownish mineral occurring in orthorhombic crystals. It is a hydrous arseniate of iron. [Written also skorodite.]

Coal brought by sea; -- a name by which mineral coal was formerly designated in the south of England, in distinction from charcoal, which was brought by land. Sea-coal facing (Founding), facing consisting of pulverized bituminous coal.

Subsequent in origin; -- said of minerals produced by alteertion or deposition subsequent to the formation of the original rocks mass; also of characters of minerals (as secondary cleavage, etc.) developed by pressure or other causes.

specifically (Min.), capable of being severed by the knife with a smooth cut; -- said of minerals.

A mineral water from Sellers, in the district of Nassan, Germany, containing much free carbonic acid.

stone, intersected within by cracks which are often filled with calcite, barite, or other minerals.

A mineral or rock consisting chiefly of the hydrous silicate of magnesia. It is usually of an obscure green color, often with a spotted or mottled appearance resembling a serpent's skin. Precious, or noble, serpentine is translucent and of a rich oil-green color.

t abundant element of the earth's crust. Silicon is characteristically the element of the mineral kingdom, as carbon is of the organic world. Symbol Si. Atomic weight 28. Called also silicium.

s found native, and also combined with sulphur, arsenic, antimony, chlorine, etc., in the minerals argentite, proustite, pyrargyrite, ceragyrite, etc. Silver is one of the "noble" metals, so-called, not being easily oxidized, and is used for coin, jewelry, plate, and a great variety of articles. Symbol Ag (Argentum). A…

s of iron; the scale which files from iron when hammered; -- applied as a name to various minerals. Calcareous sinter, a loose banded variety of calcite formed by deposition from lime-bearing waters; calcareous tufa; travertine. -- Ceraunian sinter, fulgurite. -- Siliceous sinter, a light cellular or fibrous opal; es…

An iron bucket, which slides between guides, for hoisting mineral and rock.

A mineral of a bright metallic luster and tin-white to pale lead-gray color. It consist of arsenic and cobalt.