Bornite, Pyrite, Dickite, Chalcocite

Specimen ID: CPV-N67

Mineral(s)
Bornite : Cu5FeS4
Pyrite : FeS2
Dickite : Al2(Si2O5)(OH)4
Chalcocite : Cu2S
Locality
Mindat locality:
Dimensions
2.6cm x 2.5cm x 1.3cm
Events

Photo added to mindat.org

2.6 x 2.5 x 1.3 cm. The chalcocite was misidentified as Bornite with an EDS that sampled both the pyrite and the chalcocite to return a Cu Fe sulfide taken as bornite. Further work (see comment thread) conclusively showed these to be chalcocite coated pyrites. These are uncommon from this very famous Mexican locale, limited to a small find in 2015. A thin layer of chalcocite coats a complex pyrite crystal perched atop the contrasting white dickite clay matrix. A very fine thumbnail example of the species and find.
Robert Lavinsky - 26th November 2016

Photo added to mindat.org

2.6 x 2.5 x 1.3 cm. The chalcocite was misidentified as Bornite with an EDS that sampled both the pyrite and the chalcocite to return a Cu Fe sulfide taken as bornite. Further work (see comment thread) conclusively showed these to be chalcocite coated pyrites. These are uncommon from this very famous Mexican locale, limited to a small find in 2015. A thin layer of chalcocite coats a complex pyrite crystal perched atop the contrasting white dickite clay matrix. A very fine thumbnail example of the species and find.
Robert Lavinsky - 26th November 2016
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