5 20 CALC GENUS. Eafily frangible. Not particularly heavy. Geognostic and Geographic Situations. It has been hitherto found only in the Bunnat of Temefwar, and is accompanied by ores of copper. Obfervations. 1. Some fpecimens appear to pafs, or to be nearly allied to zeolite. 2. It is named fchaalifone, which in German inti' mates that it is compofed of lamellar diftinft concre tions. I have not been able to find any Engli/h word fynonymous to the German, fo that I am under the necefiity of adopting it. 3. It is compofed of lime and filica. NlN'I'I 1