PHYSIOGRAPHY. 



Common Salt Comptonite. 



143 



3. Common salt occurs chiefly in beds, some of which are of conside- 

 rable dimensions, though commonly of an irregular form, and is met 

 with in secondary rocks, accompanied by gypsum, sandstone and clay. 

 It is likewise found at the bottom and in the vicinity of salt lakes, in the 

 waters of which it is dissolved. It is contained in the waters of salt 

 springs, of several mineral wells, and of the sea, though in variable quan- 

 tities. It occurs upon certain varieties ot lava, and in some volcanic 

 lakes. 



4. In the solid state, it exists in large quantity in Poland, Hungary, 

 Transylvania, Moldavia, and Walachia, in Stiria, Upper Austria, Salz- 

 burg, the Tyrol, Bavaria, Wurtemberg and Switzerland ; also in Eng- 

 land and Spain, and numerous other countries in and out of Europe. In 

 several of these countries, and also in several of the United States, Com- 

 mon Salt exists abundantly in salt springs, from which it may be obtain- 

 ed by means of evaporation. The variety sea-salt is found in the Cri- 

 mea, in the deserts of the Caspian Sea, in Egypt, and in several places 

 in Southern Africa and America. 



5. The employment of common salt for culinary purposes, in differ- 

 ent arts and manufactures, is too familiar to need enumeration. 



COMPTONITE. Vesuvian Ko u p hon e- S p ar.' 

 Primary form. Right rectangular prism. 

 Secondary form. 



MonT - 90 00' ' 



Fig. 147. 



T on c' 

 c on c' 

 M on d' 



93 00 



- 107 05 



35 



^PHILLIPS. 



M 



d 



Cleavage parallel to T and M, the first a little more dis- 

 tinct ; also parallel to the diagonal. Fracture small con- 

 choidal, uneven. Surface d striated parallel to the edges 

 of combination with M and T. The remaining faces 

 smooth. 



