85 



Specific gravity. — 2-837 at a temperature of 59° Fahr. 



Composition. — In 100 parts: " 



Carbonate of lime, - 53-52 



Carbonate of magnesia, - 38-74 

 Alumina and peroxide of iron, 0-73 

 Insoluble matter, - 6.29 



Moisture and loss, - 0-72 



100-00 



Blue Limestone, near Anderson, Musconetcong Valley, Warren 



County. 



Description. — Colour, dark blue ; texture, very fine grained and 

 compact ; fracture slightly conchoidal. 



Specific gravity. — 2-847 at a temperature of 58° Fahr. 



Composition. — In 100 parts : 



Carbonate of lime, - 53-59 



Carbonate of magnesia, - 41-58 

 Alumina and peroxide of iron, 1-38 

 Insoluble matter, 3*44 



Moisture and loss, 0*01 



100-00 

 This is said to have been employed as a hydraulic cement 

 with success. 



Blue Limestone, south of ike Paulinskill, on the road from Newton 

 to SwartwouVs Pond. 

 Description. — Colour, light bluish gray; texture, moderately 

 close grained ; aspect, somewhat dull and earthy. 



Specific gravity.' — 2-832 at a temperature of 54° Fahr. 

 Composition. — In 100 parts : 



Carbonate of lime, - 54-95 



Carbonate of magnesia, - 33-99 

 Alumina and peroxide of iron, 2-10 

 Insoluble matter, - 7-45 



Moisture and loss, - 1-51 



10000 



