f \ 450 talc genus. Geognostic and Geographic Situations. It occurs principally in the Tyrol, where it is found in primitive mountains along with amianth. General Obfervations on the Species. The different fubfpecies of this fpecies generally occur m the fame geognoftic fituations, only the rock cork is found in mineral veins. They are ufually found in ferpentine. eleventh