SCIENTIFIC SURVEY. 409 



and occurred imbedded in albite. This specimen attracted consid- 

 erable attention at the time, from the geologists and mineralogists 

 present, on account of its size and purity. Since first finding this 

 mineral I have found other smaller specimens, nearly every time 

 that I have visited the locality ; and a very beautiful specimen, im- 

 bedded in quartz, has also been found by Mr. S. R. Carter of Paris 

 Hill. The specimens, as yet, have been found scattered through 

 the vein, but it is possible that farther exploration might reveal 

 larger quantities of it near the centre of the vein, which is now 

 buried under the rubbish. This mineral has also been found in 

 small quantities at the Hebron locality. The ore contains 18 per 

 cent, of metallic tin, and if found in considerable quantity, would 

 be very valuable ; its color is dark brown or black, often with a 

 rusty look, but when crystalized the sides of the crystals have a 

 bright, but not metallic, lustre. It is most readily distinguished 

 by its weight, its gravity being nearly as great as that of metallic 

 iron. There is another locality of tin ore In Greenwood. 



Amblygonile . This very rare and interesting mineral, not found 

 before in America, has been discovered during the past summer, 

 imbedded in the lepidolite, from both Paris and Hebron. Prof. Gr. 

 J. Brush of Yale College, has given an account of its discovery 

 and examination, in the September number of the American Jour- 

 nal of Science and Arts. This mineral is remarkable for containing, 

 like lepidolite, a considerable amount of the rare metal Lithium, and 

 probably, also, the newly discovered metals, Caesium and Rubidium. 

 It is a translucent, feldspathic looking mineral, of a white or gray- 

 ish color, cleaving perfectly in two directions, giving surfaces 

 which have a bright vitreous lustre ; and fuses readily in the flame 

 of a candle, coloring the light with a beautiful crimson, owing to 

 the lithia that it contains. It occurs in irregular masses, in the 



lepidolite. 



Yttrocerite. This very singular and rare mineral has not before 

 been noticed from Mt. Mica, but I have found a few good speci- 

 mens. It is remarkable for containing the rare metals, Yttrium and 

 Cerium, and has previously been found, in very small quantities 

 only, in one or two localities in America. This occurs in small 

 irregular masses, imbedded in Albite. Its color is dull violet, with 

 a somewhat vitreous lustre ; the hardness is less than that of feld- 

 spar, it being readily scratched by a knife. 



Lepidolite. This beautiful mineral, which is generally considered 



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