184 PHYSIOGRAPHY. 



Epidote Epistilbite. 



4. Epidote is found variously disseminated in nearly all the primitive 

 rocks, without however entering into their composition as a regular in- 

 gredient, but rather occurring in single, drusy cavities, narrow seams 

 arid veins. The finer crystallizations belong to beds of Magnetic Iron- 

 Ore. The variety Zoisite occurs in single crystals and crystalline masses 

 in beds, with Hornblende, Kyanite, Garnet and Zircon. 



5. Magnificent crystals of Epidote are found in the iron-mines of 

 Arendal, Norway. Similar varieties occur also in Sweden. Very 

 handsome crystallizations of the present species are found in Switzer- 

 land, Piedmont, the Pyrenees and the Upper Palatinate. Less remark- 

 able varieties come from the Saualpe, where the transition of the green 

 colored crystals into the grey, or Zoisite, is observed. The grey col- 

 ored Epidote, or Zoisite, is found in the Bache mountain and Schwam- 

 berg Alpe in Lower Stiria; in the Fichtelgeburge, and in the Tyrol. 

 The red mangariesian varieties occur at St. Marcel in the valley of Aosta 

 in Piedmont. 



Crystals, resembling in size, color and form, those from Norway and Swe- 

 den, occur in the iron- mine of Franconia and in its vicinity, in the state of 

 New Hampshire. Very beautiful grey crystals, though of small diam- 

 eter compared with their length, have been found at Hawley, penetrating 

 small beds of quartz in hornblende-rock. The pistachio-green crystals 

 occur at Cumberland, (R. I.) in veins and drusy cavities, in a species of 

 trap-rock. A variety precisely similar to that from Piedmont has been 

 found in small quantity at Haddam, (Con.) forming a vein in gneiss about 

 one inch wide. But the greyish white colors, or Zoisite varieties, are the 

 most frequent in the U.S. These occur in columnar compositions, in which 

 the individuals are large, at Wardsborough, (Vt.) Milford, (Conn.) but 

 particularly at Goshen and Williamsburg, (Mass.) In the last mentioned 

 places they exist in veins and beds of quartz situated in mica slate. In 

 the eastern part of Maine, a radiating variety has been discovered, which 

 Ls purplish red at the centres of the fibrous masses, but assumes the pis- 

 tachio-green where the fibres diverge most. A variety of Zoisite in 

 long, nearly impalpable fibres, of a dark bluish grey color, occurs with 

 Calcareous Spar in mica slate, at Montpelier, (Vt.) 



EPISTILBITE. Diplogenous Kouphone-Spar. 

 MOHS. 



Primary form. Right rhombic prism, M on M=135 

 10', 



