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PERIDOT , sometimes written peridote, a name applied by jewelers to " See also:noble See also:olivine," or that See also:kind of olivine which can be used as a See also:gem-See also:- STONE
- STONE (0. Eng. shin; the word is common to Teutonic languages, cf. Ger. Stein, Du. steen, Dan. and Swed. sten; the root is also seen in Gr. aria, pebble)
- STONE, CHARLES POMEROY (1824-1887)
- STONE, EDWARD JAMES (1831-1897)
- STONE, FRANK (1800-1859)
- STONE, GEORGE (1708—1764)
- STONE, LUCY [BLACKWELL] (1818-1893)
- STONE, MARCUS (184o— )
- STONE, NICHOLAS (1586-1647)
stone (see OLIVINE). The word peridot is an old See also:trade-See also:term, of unknown origin, used by See also:French jewelers and introduced into See also:science by J. R. Hairy. Peridot is practically the same stone as See also:chrysolite (q.v.), though it is convenient to restrict that term to transparent olivine of See also:pale yellowish See also:green See also:colour, and to apply the term peridot to those kinds which are darker and decidedly green: the colour, which is due to the presence of ferrous See also:iron, is never vivid, like that of See also:emerald, but is usually some shade of See also:olive-, pistachio- or See also:leek-green. Although the stone is sometimes cut en cabochon, and in See also:rose-See also:form, the cutting best adapted to display the co our is that of a table or a step-cut stone. Unfortunately the hardness of peridot is only about 6.5, or but little above that of See also:glass, so that the polished stone readily suffers See also:abrasion by See also:wear. In polishing peridot the final See also:touch is given on a See also:copper See also:wheel moistened with sulphuric See also:acid.
Although olivine has a fairly wide See also:distribution in nature, the varieties used as gem-stones are of very limited occurrence. Much my§iery for a See also:long See also:- TIME (0. Eng. Lima, cf. Icel. timi, Swed. timme, hour, Dan. time; from the root also seen in " tide," properly the time of between the flow and ebb of the sea, cf. O. Eng. getidan, to happen, " even-tide," &c.; it is not directly related to Lat. tempus)
- TIME, MEASUREMENT OF
- TIME, STANDARD
time surrounded the locality which
yields most of the peridot of See also:commerce but it is now identified with the See also:island of St See also:John, or Isle Zeboiget, in the Red See also:Sea, where it occurs, as shown by M. J. Couyat, in an altered dunite, or olivine See also:rock (See also:Bull See also:sac. See also:franc. See also:min., 1908). This is probably the See also:Topaz Isle, rotrg'tos vijvos, of the ancients. It is generally held that the See also:mineral now called topaz was unknown to See also:ancient and mediaeval writers, and that their -roirii iov was our peridot. Such was probably the See also:Hebrew pitdah, translated' topaz in the Old Testament. Dr G. F. Kunz has suggested that the peridots of See also:modern trade are largely derived from old See also:jewelry. The famous See also:shrine of the Three See also:Kings in See also:Cologne See also:Cathedral contains a large peridot, which has commonly been regarded as an emerald. It is notable that pebbles of transparent olivine, See also:fit for cutting, are found in the See also:United States in See also:Montana, See also:Arizona and New See also:Mexico; in consequence of their shape and curiously pitted See also:surface they are known as " See also:Job's tears." (F. W.
End of Article: PERIDOT
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