Tennantite-(Zn) : Cu6(Cu4Zn2)As4S12S, Bornite : Cu5FeS4, Sphalerite : ZnS

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minID: MN7-RJD

Tennantite-(Zn) : Cu6(Cu4Zn2)As4S12S, Bornite : Cu5FeS4, Sphalerite : ZnS

This image is copyrighted. Unauthorized reproduction prohibited.
Field of View: 15 cm

The sample is 13 cm x 6 cm. I personally collected this on the Bornite-Tennantite sample dump in 1978. According to the U. of Ottawa Geology website on a 2006 field trip the remnants of this sample dump (much smaller than when I was there) are all that remains of the Bornite Zone.

This is rather a long view of the sample to show the boundary between the Bornite zone (purple tarnish) and the Tennantite-Colourless Sphalerite zone. Up close the sample is a mosaic of different species with many embedded grains close to the contact. Some phases grow as metacrysts in the sulphide matrix. There is an embedded 2 cm Tennantite crystal section within the massive Bornite, growing at right angles to the elongation of the Bornite grains.

The Tennantite in this paragenesis is unusual because it has red internal reflection, almost the same colour as Pyrargyrite. According to the literature this happens only when Tennantite is very low in iron. The companion colourless Sphalerite is also almost iron free.

Thorpe et al. (1976) measured 2 Tennantites from the Bornite Zone. One is Tennantite-(Zn): Cu10.13Fe0.03Zn1.86As3.94S13.00 and the second is a phase on the border of Tennantite Zn/Fe with Cu10.71Fe1.17Zn1.16As3.22S13.00. There is no detectable Se in either analysis, though it was measured for. These Tennantites occur with many Se-bearing phases, including Se-bearing Carrollite: Co2.03Cu0.57Ni0.11S3.85Se0.14 and the Bornite from this paragenesis has 0.16 apfu Se.

A 1999 Economic Geology article on the Bornite Zone by Hannington has microprobe analyses for all of the Bornite Zone phases and indicates the average Fe for the Tennantite in this zone is 0.67 wt %.

All of the sulphides and sulphosalts in the paragenesis except Tennantite have measurable Se. The sulphides and sulphosalts outside the Bornite zone do not have Se, though Tetrahedrite and Galena are not uncommon in the other lenses. A 2013 M.Sc. thesis from the U. of Ottawa by Thomas Gemmell on the D Lense at Kidd Creek indicated it was enriched in bismuth but had no selenium. His analyzed Tetrahedrite is Ag dominant at: (Cu5.73 Ag0.27)6(Ag4.16Fe1.85Zn0.18)6.19Sb4.06S12S0.74◻0.26.

This photo has been shown 721 times
Photo added:16th Nov 2011
Dimensions:2272x1704px (3.87 megapixels)
Date/Time of Photo:30th Nov -0001 00:00:00
Camera:NIKON E4300
Exposure time:1/30s
Focal Length:8mm
Focal Length (35mm film equivalent):38mm
ISO speed:100

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