of the Southern part of Essex County. 87 



Far. 5, Crystallized quartz may be found in many places, but 

 very few specimens worthy a place in a cabinet. 



A very interesting variety of crystallized quartz, however, 

 occurs in a vein in the trap rocks, near Crystal Beach, Nahant. 

 Many of the crystals are tinged with the green chlorite, which 

 is diffused in the trap. 



The width of the vein is from three to eight inches, and the 

 crystals being attached to the sides at right angles, are variously 

 interlaced with each other ; making it difficult to procure good 

 specimens. 



The crystals are covered with a coating of drusy quartz, and 

 many of them appear to have been once broken, the two extrem- 

 ities more or less displaced, and reunited, forming an offset. 

 The crystals of quartz at this locality are very easily broken ; 

 occasioned by the chlorite. 



Sub species 1. Prase. 



Epidote intimately combined with either quartz, feldspar, or 

 hornblende, occurs abundantly at Nahant, and from thence along 

 the coast to Marblehead. 



Sub species 2. Chalcedony. 



A few small pieces of chalcedony have been found on the 

 beaches in Lynn, and among the gravel upon the track of the 

 Eastern Rail Road, 



Sub species 3. Jasper. 



Saugus, has long been known as a celebrated locality of jas- 

 per. It occurs of a beautiful red color, in a plain, on the west 

 bank of Saugus river, about qne mile northerly of Childs' 

 Mills. Some portions of it are striped, spotted, or clouded with 

 grey or white. Until recently, this was the only locality of 

 jasper known in this section. 



It is now, however, well known that great abundance of dif- 

 ferent shades of red, purple, green striped, spotted, clouded, va- 

 riegated and veined jasper, exists, about half a mile west and 

 south west of the former locality, where the finest specimens of 

 each variety may be obtained. Some portions of the variegated, 

 exhibit a beautiful mixture of green and purple, others of red 

 and grey, and others of purple and grey, (or white) with nume- 

 rous ramifications of scarlet colored veins. 



The veined jasper is a great curiosity ; it is a deep red, or 



