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t Cat’s Eye. 3 01 ! ' ” ' r ' ' \t 30th Species. Cat’s Eye. Its colour is generally of a greenifh or yellowifh grey, or light, or dark yellowifli brown, or red- difh brown, or ftriped with thefe colours-, and, in certain pofitions, particularly when polilhed, emitting a filvery or yellowifli movable efful- genee. , 1t is found in blunt or rounded fragments, and comes from Ceylon. Its luftre, 2. Tranfparency, 3.2. Its fradture imperfedtly conchoidal, fometimes approaching to the fplintery. Fragments, 3. Hardnefs, 10. Sp. gr. from 2,cd to 2,66. 31 ft Species. Flint. Feuer Stein of the Germans. Commonly of a yellowifli, or bluifli grey co lour *, the latcer, however, often paffes into the greyifh black, and the former into the ochre yel low, or brown. Several of thefe often meet in the fanie Ipecimcn, cither in veins, ftripes, clouds, or dots. Amorphous, interfperfed in other ftones, or in nodules, or rounded lumps, often pertorated, very rarely cryflallized, in double triangulär py- ramids; often alfo forming the fubftance of pe- trefadtions, particularly ot echinites. Its furface generally