220 FLUOR FAMILY. white. It is sometimes spotted or striped with verdigris green, lavender and dark violet blue, and also brownish- red. It occurs massive and corroded. Externally it is dull, or feebly glimmering : internally faintly glimmering, or dull, and vitreous, approaching to resinous. The fracture is even, which passes on the one side into small splintery, on the other into flat conchoidal. The fragments are rather sharp-edged. It is translucent in small pieces. It is semi-hard ; harder than calcareous-spar. It affords a snow-white coloured streak. It is brittle. It is easily frangible. It is not particularly heavy. Chemical Characters. When exposed to heat, it becomes feebly phosphores cent. Constituent Parts. It is said to be Fluate of Lime, intermixed with a small portion of Phosphate of Lime. Geognostic and Geographic Situations. It is found in veins, associated with fluor-spar, at Stol- berg in the Hartz: the veins traverse rocks of grey-wacke, and besides fluor-spar, contain heavy-spar and copper py rites. It has also been met with at Kongsbcrg in Nor-' way; in Salzburg; and at Adon-tschalong in Dauria. Second