PHYSIOGRAPHY. 55 



Beryl Beudantite. 



with at Limoges in France, near Zwiesel on the Rabenstein in Bavaria, 

 at Finbo and Broddbo in Sweden, and in some of the tin mines of Sax- 

 ony and Bohemia. 



The Beryl is an abundant mineral throughout New England ; and 

 many of its localities are distinguished for the size and perfection of the 

 crystals which they afford. The most remarkable of these is Acworth, 

 (N.H.) about fifteen miles from Bellows' Falls. They occur at this 

 place in a powerful vein of granite traversing gneiss. The largest crys- 

 tals weigh from two to three hundred pounds, and measure four feet in 

 length. Their form is that of tolerably perfect hexagonal prisms. The 

 prevailing color of the large crystals is a pale bluish green : the smaller 

 crystals are pale yellow, rarely a deep honey, or wax-yellow. At Bow- 

 doinham and Topsham, (Me.) this species is found in veins of graphic 

 granite in small but exceedingly regular crystals, of a pale greenish or 

 yellowish white color. They are mostly imbedded in a brown Quartz ; 

 and sometimes present the form of fig. 55. A few crystals of the eme- 

 rald green color have been met with at Topsham. The Albite granite of 

 Goshen and Chesterfield afford small and irregular crystals of pale green 

 colors, some of which are transparent. In Connecticut at Haddam, 

 large crystals of the yellow and yellowish-green varieties, occur at the 

 chrysoberyl vein, many of which contain implanted crystals of Chryso- 

 beryl and Columbite. A seam of Brown Quartz in a vein of mica slate 

 in the same town, has afforded very beautifully transparent crystals of the 

 form represented in fig. 56 : the quarries of gneiss in the neighborhood on 

 both sides of the Connecticut river, produce green prisms of the common 

 variety. At Monroe, a vein of graphic granite furnishes uncommonly 

 handsome crystals as respects their regularity and the number of crys- 

 tals of different sizes implanted within a small mass of the rock. 



6. Beryl, when clear and transparent, and of a fine emerald green 

 color, is highly valued as a gem : the bluish colored crystals are not so 

 highly prized, but are employed for the same purpose. 



BEUDANTITE. 



Primary form. Rhomboid. P on P'=92 30'. 



