TABLE OF CONTENTS. 



PAGS. 



Preface 363 



Description of the economic map of the State 365 



Economic map of Westchester and New York counties 370 



Economic minerals of New York 370 



f Granitic rocks 372 



j Sandstone and bluestone 381 



Building stones, ^ Slate 421 



| Limestone and marble . . 423 



[ Road metal 448 



Directory of quarrymen producing stone for building purposes 451 



Clay, shale, kaolin and feldspar for brick, terra cotta, tile and pottery. . 494 



Limestone for lime and cement 519 



Limestone for furnace flux 519 



Mill stones 527 



Marl for Portland cement and fertilizer 528 



Iron ores 528 



Mineral paint 544 



Salt and soda ash 545 



Gypsum for fertilizer and wall plaster 550 



Graphite for pencils, lubricant, crucibles, foundry facings, etc 552 



Quartz for pottery, glass, furnace linings, wood filler, etc 552 



Sand for molding 553 



Garnet for abrasive purposes 553 



Emery 555 



Diatomaceous earth or infusorial earth for polishing 555 



Talc for paper manufacture 556 



Peat 556 



Petroleum and illuminating gas 557 



Natural carbonic acid gas 561 



Mineral waters 561 



Minerals of known occurrence but not at present of commercial 



importance 579 



