688 General Index. 



Plumbaginous mica slate, . . 32'J 



Plumbago, . . . . . 47, 395 



generally associated with gneiss, . . 397 



Porcelain Clay, . . . . .36 



its agricultural character, , . 12 



Porphyry, its use for ornaments, . . .20 



sienitic, .... 21,453 



black and green, 21 



defined, . . . . .442 



its mineralogical characters, . . . 443 



compact feldspar, . . . 443 



antique, . . . 445 



brecciated, . . 446 



its topography, .... 447 



its geological position, . , .448 



its mineral contents, . 449 



its theory, 450 



Potter's Clay, . 37 



Prehnite, . . . ' ', 434 



Price of wrought and unwrought granite, . .* .17 



Primitive Greenstone, . 375 



Prismatic Iron Ore, . ' 178 



Pseudo-stratification of sienite, . . . 456 



of granite, . . \ 473 



Purgatory in Sutton, . . . 106 



in Newport, R. I. . 107 



Pyritous Copper, . 225, 462 



Pyrope, . . . ' . . 398 



Q. 



Quartz, crystalized, yellow, rose red, &c. . . 343 



and pseudo-morphous. . . 461, 502 



and yellow, . . 31>9 



drusy, . . w . .372 



crystalized in geodes, .... 435 



tubular, smoky, and amethystine, 435 



fetid, . . 503 



radiated, . 508 



crystals, their use, . .. ' . 51 



Rock, its agricultural character, . . .11 



its economical uses, . . . 22 



granular, used as buhrstoae, . . 41 



used in making glass, . . 40 



its place among the rocks, . . 316 



its mineralogical characters, , . 317 



its topography, . . 320 



dip, direction, &c. of its strata, 



its mineral contents, . . ' * . 323 



associated with graywacke, . 256 



Quartzose Breccia, . .318 



Conglomerate, . . 319 



Quincy Granite or Sienite, . . 14 



R. 



Radiaria Fossil at W. Springfield tt' . 240 



Radiated Pyrites, . 190 



Rattle Snake Hill, . " * * .77 



Ravine of Westfield on Agawam River, . ' . 8 ^ 



and Gorge of Deerfield river. ; . 90 



Red Oxide of Copper, < 226 



Report, how divided, . . 3 



Reptiles in Massachusetts, Catalogue of ' . 552 



Rhoetizite, . . . 345 



Richmond, Iron Ore in . 56 



