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A yellow mineral consisting of oxalate of iron.

One of the adherents of Charles Stewart Parnell (1846-91) in his advocacy of home rule for Ireland.

A glassy volcanic rock of a grayish color and pearly luster, often having a spherulitic concretionary structure due to the curved cracks produced by contraction in cooling. See Illust. under Perlitic.

A whitish mineral occurring in radiated or fibrous crystalline masses. It is a hydrous silicate of lime and soda.

Same as Pearlite.

A rare mineral, occurring crystallized and in cleavable masses, usually white, or nearly so, in color. It is a silicate of aluminia and lithia.

A colorless variety of chabazite; the original was from Leipa, in Bohemia.

A hydrous arsenate of lime, usually occurring in silky fibers of a white or grayish color.

A small calcareous concretion formed in a vein; a vein stone.

A compact, feldspathic, igneous rock containing nephelite, haüynite, etc. Thin slabs give a ringing sound when struck; -- called also clinkstone.

An arrangement of two photographic cameras, the plates of which may be brought into exactly the same plane, used in surveying and map making. From the differences between two pictures taken at the same moment, measurements in all dimensions of the region may be obtained.

A mineral related to ottrelite.

An old name for a fossil plant.

A fibrous variety of serpentine.

See Picrolite.

An apple-green mineral having a greasy feel. It is a hydrous silicate of nickel, magnesia, aluminia, and iron.

A variety of calcite, or calcium carbonate, consisting of aggregated globular concretions about the size of a pea; -- called also peastone, peagrit.

A pluriliteral word.

Smooth; polished. [Obs.] Rays of light falling on a polite surface. Sir I. Newton.

In a polite manner; with politeness.