186 BULLETIN OF THE ESSEX INSTITUTE. 



No. 36. Quartz : False Topaz. 

 Light yellow color, Rockport. 

 No. 37. Quartz: Smoky Quartz. 



The massive vein form is found in the rhyolites of 

 Marblehead and in the granitite of Gloucester and Rock- 

 port. 

 No. 38. Quartz : Cairngorm Stone. 



Found in nearly black crystals at the Pomeroy quarry, 

 Gloucester, and at Rockport. 

 No. 39. Quartz: Milky Quartz. 



Massive veins occur at South Georgetown and Grove- 

 land. 

 No. 40. Quartz : Ferruginous Quartz. 



In the carboniferous slates of Topsfield. 

 No. 41. Quartz : Rose Quartz. 



Occasionally found in the glacial drift. 

 No. 42. Prase : Actinolitic Quartz. 



A vein occurs at Bass Point, Nahant. 

 No. 43. Chalcedony. 



Good specimens occur at Prospect Hill, Beverly, and 

 it is also found Alling the amygdules of the amygdaloidal 

 melaphyre at Saugus. 

 No. 44. Basanite : Giert. 



Found in the Cambrian rocks at Peabody, Middleton, 

 Rowley and Nahant Head, Nahant. 

 No. 45. Jaspelite. 



Saugus Centre and Nahant. This is the so called red 

 Jasper as popularly known. 

 No. 46. Quartzite. 



Saugus, Lynnfield Centre, etc., forming large beds in 

 the lower Cambrian rockmass. 

 No. 47. Opal, var. Silicious Sinter. 



Found as segragated, granulär, stalactitic masses at the 

 contact of the augite-syenite and granite in Beverly. 



