. Bulletin - New York State Museum. Science. 54 NEW IORK STATE MUSEUM Chalcocite (copper glance) Cu2S Chalcocite is a copper sulfld containing $ sulfur and $ copper. Though often occurring in orthorhonibic crystals (pi. 142) chal- cocite is more frequently met with in masses which somewhat resemble argentite but are much more brittle; it may be dis- tinguished from bornite by the absence of the characteristic red- brown color peculiar to bornite. The luster is metallic and the streak and color lead-gray, the latter taking a dull black tarnish on exposure. Chalcocite occurs coininonly a
. Bulletin - New York State Museum. Science. 54 NEW IORK STATE MUSEUM Chalcocite (copper glance) Cu2S Chalcocite is a copper sulfld containing $ sulfur and $ copper. Though often occurring in orthorhonibic crystals (pi. 142) chal- cocite is more frequently met with in masses which somewhat resemble argentite but are much more brittle; it may be dis- tinguished from bornite by the absence of the characteristic red- brown color peculiar to bornite. The luster is metallic and the streak and color lead-gray, the latter taking a dull black tarnish on exposure. Chalcocite occurs coininonly associated with other copper minerals. Beautiful specimens of this mineral are found in the Cornwall mines. It occurs also in Bohemia, Saxony, Mexico and South America. Interesting crystals are found at Bristol Ct., and massive varieties to considerable extent at Butte Mont. Chalcocite is an ore of copper. Sphalerite (zinc blende or blende) ZnS The zinc sulfid known as sphalerite or blende contains 33$ sulfur and 67$ zinc. Sphalerite often contains cadmium manganese and iron in small quantities. It crystallizes in the tetrahedral group of the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original New York State Museum; New York State Museum. Albany : New York State Education Dept
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