414 TALC GENUS. Constituent Parts. \ ' What is called the nephrite of Switzerland, ac cording to Hoepnfer affords, Silica 47»° Magnefia 38,0 | Alumina f 4»o i Lime 2,0 Pxyd of Iron 9.® Geognostic Situation \ Is not known ; probably occurs in ferpcntine. Geographic Situation. It is found on the banks of the river of Amazons, in South America ; in China and the Eaft Indies? and it is fa;d to have been found in feveral parts of Euiope, as in the dutchyof Auftria, Moravia, Tyro 1 ’ Switzerland and Savoy. It is difficult to faw and cut, and although it takes a good polifh it has ftill an oily and muddy afp* 1 ' Its great tenacity, however, enables the artift to e* e ' cute
