GEOLOGICAL AND MINEKALOGICAL NOTES. 185 



An earthy form of this mineral occurs in a hillside, 

 northwest of the old nieeting house, at Beverly Farms. 

 No. 26. Limonite : Brown Hematite : Bog Iron Ore. 



Found in the beds of brooks and small ponds in nearly 

 all of the towns in Essex Connty. This was the ore used 

 at the Saugus Iron Works, the first iron casting works in 

 America, in 1643. 

 No. 27. Limonite : Brown Ochre. 



Mineral paint mine, Georgetown. 

 No. 28. Limonite: Yellow Ochre. 



Danvers, Topsfield, Newbury, etc. 

 No. 29. Limonite: Clay Iron Stone. 



Good specimens of this mineral are found in pockets in 

 the granite at the Pomeroy quarry, Gloucester. 

 No. 30. Xanthosiderite. 



Found in segregated masses, stalactitic and botryoidal 

 in form, in crevices of the granitite at the quarry of the 

 Rockport Granite Co., Rockport. 

 No. 31. Brucite. 



A mineral belonging to the magnesia group, found as- 

 sociated with Serpentine at the Serpentine ledge, Lynnfield 

 Centre. 

 No. 32. Wad : Bog Manganese. 



Found in large masses in a meadow and brook at Put- 

 namville, and in the form of rounded concretions in small 

 ponds and spring holes at Peabody and Topsfield. 

 No. 33. Quartz. 



Massive vein quartz occurs at North Beverly, Danvers, 

 and various othey places in the county. 

 No. 34. Quartz : Rock Crystal. 



Found in large masses and crystals in pegmatite veins 

 at Andover, Nahant, Rockport, etc. 

 No. 35. Quartz: Drusy Quartz. 



In minute crystals, Danvers, Nahant, West Newbury. 



