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Economic Geology; February 1962; v. 57; no. 1; p. 111-113
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Stability relations and paragenesis of copper oxides and chlorides at the Algomah Mine, Ontonagon County, Michigan

S. A. Williams

The paragenesis of the secondary Cu minerals is outlined. The free energy for paramelaconite was calculated as -28.12 kcal. indicating its instability at standard conditions. Its relative abundance at this location must be due to an expanded stability of cuprite above log P0 2 = -37.9. Paratacamite, with a free energy slightly less than that of paramelaconite, has a plotted stability field that lies along the atacamite-nantokite boundary making it an intermediate step in the reaction atacamite <--> nantokite.

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