NJDEP - NJGS - First Annual Report of the Geological Survey of the ...

@88Iron pyrites iFranklinite ;Red oxide of zinc;Galena (argentifcrous);Sulphate of baryta;Roofing slate;I Limestone for building and agricultural pnrposgs;, Marble ;Calcareous sinter;Shell marl ; ..Peat;Kaolin (porcelain clay).M_GNETIC II_01_" ORE--MAGNETITE---MAGNETIC OXIDE OF IROI__NATIVE MAGNET---LOADSTONF_This ore, when pure, hasan iron black color, and metalliclustre; is str_gly magnetic; produces a black streak whenrubbed on a surface of unglazed white porcelain, and gives ablack powder when pulverized. Its composition is oxygenand iron--a combination of the protoxid¢ and peroxide---72.4,_firon and 27.6 of oxygen, It may.be readily distinguishedfrom other eros of iron by its black streak and powder, andmagnetic properties.The description here given is that of pur_rnaguetie iron ore,'but this substance is very often associated with foreign matter,us quartz, mica, hornblende, feldspar, etc.; which alter thecolor and general character of the ore, according to the kind,quantity, and texture of the foreign matter. It is one of themost valuable ores of iron ; and from it the greater part of theiron of this State is manufactured. It occurs in veins andbeds, and is disseminatdd through igneous and metamorphicrocks. In this district it occurs chiefly in the igneous andmetamorphic rocl_ of the Highlands, and valley of the Wallkill.•The following are among the most important localities..'3iINEW JERSEY GEOLOGICAL SURVEY