708 Transactions of tub American Institute. 



Pounds 

 Avoirdupois. 



Antimony regnlus, a metal imported from Europe for tyi)e- 

 founders, has a specific gravity of 6.5, and a cubic foot weighs 400 



Apatite, or phosphate of lime, used for the manufacture of super- 

 phosphate, or artificial guano, and found in Canada, and lately 

 in South Carolina, has a specific gravity of 3.0, and a cubic 

 foot weighs 186 



Arsenical iron pyrites, commonly called mispickel, a mineral 

 widely difi:used in tiie United States, contains about fifty per 

 cent arsenic, has a specific gravity of 6.0, and a cubit foot 

 weighs 370 



Asbetus, a very useful mineral in the arts, has a specific gravity 

 of 3.0, and a cubic foot weighs 186 



Asphaltum, also called mineral pitch, has a specific gravity of 

 1.0, and a cubic foot weighs 62 



Barytes, the sulpliate of baryta, a useful substance for manutac- 

 turing purposes, has a specific gravity of 4.5, and a cubic foot 

 weighs 310 



Baryta carbonate, or Witherite, a mineral used in the manufac- 

 ture of Elancfix has a specific gravity of 4.0, and a cubic foot 

 weighs 248 



Bismuth, a material of Babbit's metal, has a specific gravity of 

 9.7, and a cubic foot •sveighs 600 



Bituminous coal is of light gravity, say 1.5, and a cubic foot 

 weighs 90 



Black lead, also called graphite, has specific gravity of 2.0, and a 

 cubic foot weighs 125 



Black Jack of tlie miners, but a blende, or sulphurct of zinc, has 

 a specific gravity of 4.0, and a cubic foot weighs 250 



Bog iron ore is an eai-thy iron ore, has a specific gravity of 4.0, 

 and a cubic foot weighs 250 



Brown hematite, a valuable iron ore, and abundant in the United 

 States, has a specific gravity of 4.0, and a cubic foot Aveiglis. . 250 



Building stones, comprising granite, gneiss, syenite, etc., have a 

 specific gravity of 3.0, and a cubic foot weighs . 186 



Calaniiiie is a silicate of zinc, has a specific gravity of 3.3, and a 

 cubic foot weighs ■ 190 



Chromic ii'on forms the base of chrome yellow and bicai'bcuiate 

 of potassa, has a specific gravity of 4.5, and a cubic foot weigiis 260 



Copper pyrites, a very abundant mineral, has a specific gravity 

 of 4.0, and a cubic foot M'cighs 260 



Derbyshire spar, or fluorspar, has a specific gravity of 3.0, and a 

 cubic foot weighs 186 



Feldspar, the base of porcelain, milky glass, ere, has a specific 

 gravity of 3.0, and a cubic foot weighs 190 



Flint, this mineral belongs to the quartz family, has a specific 



gravitv of 2.5, and a cubic foot weighs 110 



But the loose sand weighs, per cubic foot 95 



Frankliiiite, a very valuable manganese iron ore, lias a specific 

 gravity of 5.0, ancj a cubic foot weighs. 310 



