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JASPER

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Originally appearing in Volume V15, Page 279 of the 1911 Encyclopedia Britannica.
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JASPER , an opaque compact variety of See also:

quartz, variously coloured and often containing argillaceous See also:matter. The See also:colours are usually red, See also:brown, yellow or See also:green, and are due to admixture with compounds of See also:iron, either oxides or silicates. Although the See also:term jasper is now restricted to opaque quartz it is certain that the See also:ancient jaspis or iavais was a See also:stone of considerable translucency. The jasper of antiquity was in many cases distinctly green, for it is often compared with the See also:emerald and other green See also:objects. Jasper is referred to in the Niebelungenlied as being clear and green. Probably the jasper of the ancients included stones which would now be classed as See also:chalcedony, and the emerald-like jasper may have been akin to our See also:chrysoprase. The See also:Hebrew word yashefeh may have designated a green jasper (cf. See also:Assyrian yashpu). See also:Professor See also:Flinders See also:Petrie has suggested that the odem, the first stone on the High See also:Priest's breastplate, translated " See also:sard," was a red jasper, whilst tarshish, the tenth stone, may have been a yellow jasper (See also:Hastings's Dict. See also:Bible, 1902). Many varieties of jasper are recognized. Riband jasper is a See also:form in which the colours are disposed in bands, as in the well-known ornamental stone from See also:Siberia, which shows a See also:regular See also:alternation of dark red and green stripes.

See also:

Egyptian jasper is a brown jasper, occurring as nodules in the Lybian See also:desert and in the See also:Nile valley, and characterized by a zonal arrangement of See also:light and dark shades of See also:colour. See also:Agate-jasper is a variety intermediate between true jasper and chalcedony. Basanite, lydite, or Lydian stone, is a See also:velvet-See also:black flinty jasper, used as a touchstone for testing the purity of See also:precious metals by their streak. See also:Porcelain jasper is a See also:clay indurated by natural calcination. (F. W.

End of Article: JASPER

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