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CHRYSOPRASE. 211 Geognostic Situation. It occurs, in plates and cotemporaneous veins, along With quartz, hornstone, common calcedony, semi-opal, asbestus, indurated talc, lithomarge, grcen-earth, steatite, and pimelite, in primitive serpentine. Geographic Situation. It has hitherto been found only in the Principality of Munsterberg, in Lower Silesia, in the vicinity of the towns of Glassendorf, Grochau, and Kosemitz. Uses. Tliis beautiful stone is much prized by jewellers. The Colour, when deep and pure, is very agreeable to the eye. It is generally cut into a convex form, or what jewellers Call en cabochon, and is facetted underneath, or at the hase. It is frequently cut into ring-stones, and, when set, green taffeta is used as a foil; and when used in or namental dress, it is found to harmonise with diamonds and pearls. It is said that its colour fades when kept long in a warm and dry place, or when much exposed to the air: on this account, it is recommended to keep it in moist cotton. As the colouring substance of this mine ral is nickel, it is difficult to explain the change of colour just mentioned. It is not easily cut, because it is apt to % in pieces; and frequently during the facetting it cracks, a nd sometimes splinters. It is cut on tin and leaden I'lntes, by means of fine emery moistened with water. The larger and impurer masses are cut into snuff boxes, seal-stones, and similar articles. Vex - y beautiful O 2 masses