Heavy Spar, t 579 Geognostic and Geographic Situations. Occurs in drufy cavities in veins of heavy fpar- It has been found in one of the r levels of tlm mine called Krieg and Frieden near Freyberg ; alfo m the mines of Staffordlhire and Derbylhire in England. Other localities are mentioned, but on doubtful au- thority. t Obfervations. t 1. It is well diftinguifhed from all other earthy mi- nerals by its greater fpecific gravity. 2. It has been fuppofed to be compaa heavy lpar difintegrated, but its occurrence in clofe cavities ap pears on the contrary to Ihew that it is an ongma powdery depofit. SECOND