188 BULLETIN OF THE ESSEX INSTITUTE. 



Found as the last and also in a coarse pegmatitic mass 

 on Misery Island, Salem harbor. 

 No. 58. Hornblende. 



Irregulär crystals are abundant in the hornblende-gran- 

 ite of Peabody and, microscopically, it is common in the 

 diorite, syenites and the dyke rocks. 

 No. 59. Tremolite. 



The Devil's Basin, Newbury. 

 No. 60. Actinolite. 



Long crystals are found at Bass Point, Nahant, and it 

 is also found in a large pegmatite boss in the quarry of 

 the Rockport Granite Co., Rockport. 

 No. 61. Asbestus, pseudomorph of Actinolite. 



A vein, six inches wide, in the diabasic norite, at Bass 

 Point, Nahant. 

 No. 62. Arfvedsonite : Alkali Hornblende. 



Irregulär crystals are found at Salem Neck and larger 

 masses on Coney Island, Salem harbor, in the elseolite- 

 zircon-syenite. 

 No. 63. Ainigmatite. 



Rare, in microscopic masses in the elaeolite-zircon-syen- 

 ite, Great Haste ledge, Salem harbor. 

 No. 64. Cossyrite. 



Microscopic crystals in the augite-syenite at Magnolia. 



No. 65. Glaucophane. A deep blue hornblende. 



Massive forms in the augite-hornblende-granite at Pick- 

 ering's Point, Salem, and in the granite-porphyrite at 

 Marblehead Neck, etc. 

 No. 66. Chrysolite : Olivine. 



Found in porphyritic crystals in olivine basalt dyke 

 rocks, Salem Neck, etc. 

 No. 67. Fayalite. 



A large mass, at a depth of sixty feet, in the quarry of 

 the Rockport Granite Co., Rockport. (See Penfield and 



