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A mineral usually of a reddish brown color, and brilliant metallic adamantine luster, occurring in tetragonal crystals. In composition it is titanium dioxide, like octahedrite and brooklite.

Resembling sagenite; -- applied to quartz when containing acicular crystals of other minerals, most commonly rutile, also tourmaline, actinolite, and the like.

. (Zoöl.) See under Giant. -- Salamander's hair or wool (Min.), a species of asbestus or mineral flax. [Obs.] Bacon.

Any mineral salt used as an aperient or cathartic, especially Epsom salts, Rochelle salt, or Glauber's salt.

A rare mineral having a velvet-black color and submetallic luster. It is a niobate of uranium, iron, and the yttrium and cerium metals.

a articulata), and pulverized for pounce; -- probably so called from a resemblance to the mineral.

A tough, compact mineral, of a white, greenish, or grayish color. It is near zoisite in composition, and in part, at least, has been produced by the alteration of feldspar.

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.]

One who scrutinizes; a close examiner or inquirer. Ayliffe.

A scrutinizer; specifically, an examiner of votes, as at an election.

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.

One who, or that which, searhes or examines; a seeker; an inquirer; an examiner; a trier. Specifically: