. Bulletin - New York State Museum. Science. 60 NEW YORK STATE MUSEUM It resembles pyrite in crystallization and luster and is silver- white to gray in color. Like smaltite it is a source of cobalt compounds. Marcasite (white iron pyrites) FeS2 Marcasite is the orthorhombic iron disulfid, and has the same composition as pyrite. The dimorphism ofi iron disulfid is all the more interesting because pyrite represents an isomorphous group of sulfids and arsenids which crystallize in similar forms of the isometric system, and marcasite heads a similar isomorphous group crystallizing in closely relat
. Bulletin - New York State Museum. Science. 60 NEW YORK STATE MUSEUM It resembles pyrite in crystallization and luster and is silver- white to gray in color. Like smaltite it is a source of cobalt compounds. Marcasite (white iron pyrites) FeS2 Marcasite is the orthorhombic iron disulfid, and has the same composition as pyrite. The dimorphism ofi iron disulfid is all the more interesting because pyrite represents an isomorphous group of sulfids and arsenids which crystallize in similar forms of the isometric system, and marcasite heads a similar isomorphous group crystallizing in closely related forms of the orthorhombic system. Twins and crystalline aggregates are common, resembling spearheads, cockscombs, etc. often with radiated, stalactitic structure as in pi. 162. The color of marcasite is somewhat whiter than that of pyrite, which it closely resembles. Marcasite occurs in Saxony, Bohemia and England, and in the United States, associated with sphalerite, at the zinc mines of Missouri, in Wisconsin and at Warwick, Orange co. N. Y. It is used in the manufacture of sulfuric acid. It is also found in nodular concretions in the Tertiary and Cretaceous clays of Long Island and Staten Island. Arsenopyrite (mispickel) FeAsS Arsenopyrite is the sulfarsenid of iron and contains 46$ arsenic, $ iron and $ sulfur. Arsenopyrite crystallizes in the orthorhombic system in forms resembling marcasite. A common type of crystal is represented in fig. 173 and a characteristic grouping in pi. 17!. Arsenopyrite commonly occurs in coarse to fine granular masses or disseminated grains. It is silver-white to gray, with a metallic luster. Arsenopyrite is found principally in veins in crystalline rocks associated with other metallic sulfids and arsenids. The deposits of New South Wales, California and Alaska occasion- ally carry some gold. It is found in many European localities,. Please note that these images are extracted from scanned page images that may have been digitally enh
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