196 BULLETIN OF THE ESSEX INSTITUTE. 



No. 142. Malachite: Green Carbonate of Copper. 



Found assoeiated with gray copper at the Osgood mine, 

 South Georgetown. 

 No. 143. Azurite: Blue Carbouate of Copper. 



Osgood mine, South Georgetown. 



No. 144. Quartz. 



A quartz crystal an iuch broad, a pseudornorph of fluor- 

 ite, deep scarlet in color, was found in the granitite at the 

 quarry of the Rockport Granite Co., Rockport. 

 No. 145. Coal : Earthy Brown Coal. 



East side of Nahant, near the old iron mine. ' 

 No. 146. Bog-butter : Oxygenated Hydrocarbon ( ?) 



Three feet below the surface, Clifton, Marblehead. 

 No. 147. Rhodonite : Red Bi-silicate of Manganese. 



"Rockport, Rev. S. Barden, collector." ^(Dr. C. T. 

 Jackson, Proc. Am. Acad. Vol. vi, p. 167.) 

 No. 148. Topaz. 



" Determined by Mr. Alger." Same citation as above. 

 Not represented in the collection of the Peabody Academy. 

 No. 149. Columbite. 



" Small twelve-sided prisms of columbite in the green 

 feldspar rock at Beverly " (Prof. C. LT. Shepard, Ameri- 

 can Journal of Science, Vol. xxxiv, p. 402.) Not repre- 

 sented in the collection of the Peabody Academy of Science. 

 No. 150. Tin Ore. 



"Hemitropic (twinned) crystals of tin ore." Same ci- 

 tation. Not represented in the collection of the Academy. 



In closing this list I would again call attention to the 

 collection of the minerals of Essex County in the museum 

 of the Peabody Academy of Science, which occupies sev- 

 eral sections in the cases devoted to the natural history of 

 the county, and which Covers, with the few exceptions 

 noted, all of the species enumerated in the list. A fewof 



