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CuFeS2
Tetragonal
Chalcopyrite, a copper iron sulfide mineral, is known from both Franklin (Palache, 1908, 1935) and Sterling Hill (Farrington, 1851). It has been little studied and is not a mineral of economic significance locally.
Chalcopyrite is bright brass-yellow, opaque, with metallic luster, and is differentiated from pyrite by its relatively inferior hardness. Specimens may be oxidized, displaying an iridescent tarnish. There are no published chemical analyses; partial ones by the writer confirm that local material approaches end-member composition.
Chalcopyrite is a minor accessory mineral of limited occurrence. It is commonly associated with sphalerite, galena, bornite, calcite, and other minerals, in both fine-grained and coarse-grained assemblages, occurring mostly in the Paleozoic sulfide veins. Masses up to 10 cm are known. Reflected-light studies by this writer reveal that tennantite, bornite, and galena are minor constituents of many chalcopyrite veins. Where hot chalcopyrite has reacted with willemite-franklinite- calcite ore, the reactants are predominantly sphalerite and magnetite, which form a black, fine-grained, dense reaction zone. The association with magnetite is common at Franklin.
An occurrence below the 700 level at Sterling Hill was reported by Jenkins and Misiur (1994).
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| Copyright © 1995 by Pete J. Dunn |
Website
by Herb Yeates
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