260 BORACITE FAMILY. It occurs generally small, seldom large botryoidal, sometimes approaching to reniform. The surface is granulated or rough, and dull. Internally it is glimmering and pearly. The fracture is very delicate and stellular fibrous, and sometimes passes into splintery. It occurs in thin and concentric lamellar distinct con cretions. It is translucent on the edges. , . It is semi-hard, approaching to soft. It is brittle. It is not particularly heavy. Specific gravity, 2.885, Klaproth. Chemical Characters. It intumesces and melts into a white glass before the blowpipe. Constituent Parts. Silica, - - - 36.00 Lime, ... 39.50 Boracic Acid, - - 13.50 Oxide of Iron, - *- 1.00 Water, ... G.50 96.50 Klaproth, Beit. b. v. s. 125. Geognostic anil Geographic Situations. It occurs in the Kjenlie mine, near Arendal in Nor way, along with common quartz, schorl, calcareous-spar, iron-pyrites, and magnetic ironstone, in a bed in gneiss. Observations-
