198 PHYSIOGRAPHY. CLASS n. 



den, Norway, Corsica, &c., in the Grampians in Scotland, 

 in Unst, one of the Shetland isles. Upon beds and veins 

 with metallic ores and Pyrites they are found in consider, 

 able quantities in Cornwall, where they are known by the 

 name of Peach, also in Saxony, Salzburg, Sweden, &c. 

 The crystallised varieties occur in veins, frequently 

 in mount St Gothard in Switzerland, also in Salzburg, 

 Sweden, and other countries. The chief localities of 

 Green- earth are the Monte Baldo near Verona, Iceland, 

 the Faroe islands, Tyrol, Hungary and Transylvania, and 

 various places in Great Britain and Ireland. 



5. Some of the varieties occurring in beds in large masses, 

 are used as fire-stones in iron furnaces. In Switzerland 

 potstone is turned into culinary and other vessels, and 

 worked into plates for the construction of stoves. Green, 

 earth is used, both raw as a green colour, and burnt as a 

 reddish -brown colour, for painting houses, &c. The Vene- 

 tian Talc, a variety of common Talc of a greenish-white 

 colour, formerly used as a medicine, seems to be no longer 



2. EHOMBOHEDRAL TALC-MICA. 



Rhomboidal Mica (in part). JAM. Syst. Vol. II. p. 

 221. Khomboidal Talc-Mica, Man. p. 127- Mica. 

 PHILL. p. 106. Glimmer. WERN. Hoffm. H. B. II. 

 2. S. 115. Glimmer. HAUSM. IT S. 487. Glim- 

 mer. LEONH. S. 4C1. Mica. HAUY. Trait^, T. III. 

 p. 208. Tabl. comp. p. 53. Traitd, 2de Ed. T. 

 III. p. 111. 



Fundamental form. Rhombohedron of unknown 

 dimensions. Vol. I. Fig. 7. Simple forms. 

 R _ <z> (P) ; R -f- oo ; P (*, *') ; P + oo 

 (My r). Various combinations of these forms, 

 whose character seems to be di-rhombohedral, as 

 l.R or. P-f-oo; 2. R GD. P. P + oc; 

 3. R. x. P. R + QD. P + OD,&C. 



