Spodumene and its Alterations. 321 



and Muscovite, were discovered, of which the description, and the 

 nature of the process of alteration, will be discussed beyond. 



The vein in Huntington has furnished the finest crystals of 

 Spodumene for all mineralogical cabinets, sometimes 16 inches 

 in length, as well as the material from that locality for the 

 well-known and excellent analyses of Smith and Brush, and 

 quite recently of Doelter. 



The vein in the township of Chester was first discovered and 

 opened by E. Emmons, and the Spodumene was found to be 

 associated with Smoky Quartz, Muscovite, Cleavelandite, Indico- 

 lite, etc. In 1870, however, I could find no Spodumene remain- 

 ing in a small vein of this general character, showing traces of 

 blasting, which seemed to be the one opened by Emmons. 



Analyses of Spodumene. — In the following table, I have now 

 to present two analyses made on specimens of Spodumene from 

 this region, probably almost unaltered. 



In all analyses given in this paper, the material had been pre- 

 viously picked out under the loup, finely ground, and dried 

 at 100° C. 



I — Unaltered Spodumene from the Levi Barrus locality in 

 Goshen. The material, carefully selected, was of a bright 

 grayish-green color, high lustre, and translucent to sub-trans- 

 parent. 



II — Unaltered Spodumene from Chesterfield Hollow. The 

 material was taken from the core of an enormous crystal, whose 

 exterior was altered into a white crust of Cymatolite. It was 

 of the same bright color and lustre as that of the preceding 

 locality, and possessed remarkable translucency, dimmed in a 

 hand-specimen by the numerous fissures, but with its constituent 

 grains perfectly transparent. 



Ill— Mean of analyses I and II. Also, for comparison, the 

 following two analyses of the same mineral from the other Mas- 

 sachusetts localities (Am. J. Sci., II, xvi, 372, 1853). 



IV — Spodumene from .Norwich (now called Huntington). 

 Analysis by Smith and Brush. 



V — Spodumene from Sterling (in eastern Massachusetts). 

 Analysis by Smith and Brush. 



