224 FLINT GENUS. Constituent Parts. Y-} Silica 44 44 to 47 49 Alumina 20 20 tO 12 16 Baryt >4 £5 tO 20 18 Water 12 . 16 to 16 ij Iron 100 4 ioo 99 98 Htyer. Wejirumb. Klaproth. Geognostic and Geographic Situations. It has been hitherto found only in mineral veins> and in agate balls- At Andreafberg in the Harz occurs in veins accompanied with quartz, calc Ip ar » lead glance, copper pyrites, iron pyrites, fahle ore, &c- and generally occurs in drufes, and of all the materials of the vein it is the neweft. Strontian J 11 Argylefhire is the only other place where it has been obferved in veins. At Oberftein it occurs ia hng^ e cryftals in agate balls, according to Hauy. THIRTY'