44 EMERY MINE OF CHESTER, MASS. 



or margarite in Asia Minor as an associate mineral with emery. 

 On the 22d of October last, 1863, I discovered, while surveying 

 an iron -mine in Chester, Mass., some beautiful veins of the 

 margarite, from half an inch to two inches wide, and of a fine, 

 delicate rose color, or light-pink. The nature of this mineral 

 I did not discover until my return to Boston, but at first 

 supposed it was lepidolite ; on analysis it proved to be mar- 

 garite, and from that I ventured to predict the occurrence of 

 emery; but no attention was paid to this prediction by the 

 owners of the mine, who were more intent on the iron-ore. A 

 few weeks since I saw Dr. Lucas, one of the owners, resident 

 in Chester, and called him into my office, and explained to him 

 the great value of emery, and told him how to detect it, and he 

 promised to make the search I required, and took exact direc- 

 tions from me. The next day after his return to Chester he 

 found the emery, a big vein nearly six feet wide, which had 

 been mistaken by him for iron-ore, it being very magnetic. 

 I write you this to show you the importance of your discovery 

 of the emerylite or margarite (for this appears to be identical) 

 as an associate of emery, and also as an interesting case of 

 deduction from scientific memoirs." 



Accompanying the letter he sent me a paper giving me a 

 summary of a communication he had made to the Boston 

 Society of Natural History on the subject, concluding by 

 remarking that "had not the occurrence of emerylite and 

 chloritoid called his attention to the probable existence of 

 emery at this locality, it would have been overlooked to this 

 day, and no one knows how much longer. The fact was men- 

 tioned as an example of the real uses of supposed useless 

 minerals; and the Doctor took occasion to express his obliga- 

 tions to Dr. Smith of Louisville for his valuable contributions 

 to our knowledge of the associate emery minerals of the Grecian 

 Archipelago and Asia Minor." 



These statements are sufficient to show how far my geological 

 observations served as a guide to Prof. C. T. Jackson in his 

 deductions with reference to the existence of emery in Chester, 

 and with what diligence Dr. H. S. Lucas followed up the latter's 

 directions, resulting in the valuable development of emery. 



I have since visited the locality, having done so in the month 

 of March last. The geological character and position of the 



