Jordanite, Baryte, Cupropearceite, Pearceite, Chalcopyrite, Tennantite, Unnamed (Fe-analogue of Argentotennantite-(Zn)), Galena

Specimen ID: CX8-5L3

Mineral(s)
Jordanite : Pb14(As,Sb)6S23
Baryte : BaSO4
Cupropearceite : [Cu6As2S7][Ag9CuS4]
Pearceite : [Ag9CuS4][(Ag,Cu)6(As,Sb)2S7]
Chalcopyrite : CuFeS2
Tennantite : Cu6(Cu4X2)As4S12S
Galena : PbS
Locality
Mindat locality:
Events

Photo added to mindat.org

SEM micrograph (BSE) mode of a polished section of an silver ore sample, found in 1980, containing dark red, partly As-rich pyrargyrite droplets disseminated a matrix of colourless quartz. The picture shows, in the top left area, a slightly zoned grain (grey) of the unnamed Fe-analogue of argentotennantite-(Zn) (Cu- and Sb-rich) that grades into (Sb-dominant) "freibergite" (Cu- and As-rich). The white phase is galena and the matrix consists of fluorite (dark grey) quartz (black). Note: The most Ag-rich grain reported by Kolitsch et al. (2019) (as "argentotennanite" because the IMA list of minerals at that time had a Fe-dominant formula) has the composition (Ag3.36Cu2.64)[Cu4(Fe1.61Zn0.39)](As,Sb)4S13. The polished section also contained the ore minerals chalcopyrite (common), arsenopyrite (minor), cupropearceite, jordanite, tetraedrite-(Fe) and -(Zn), tennantite-(Fe) and -(Zn), freibergite (relatively common), gersdorffite, cobaltite, pyrite, famatinite, pearceite, polybasite and several REE minerals - synchysite-(Ce), monazite-(Ce), xenotime-(Y), fluocerite-(Ce) -, as well as scheelite. This photo was originally published in: Kolitsch, U., Bayerl, R. and Topa, D. (2019): Neufunde aus der Grube Clara im mittleren Schwarzwald (V). Mineralien-Welt 30 (3), 12-27 (in German).
Uwe Kolitsch - 25th May 2019

Photo added to mindat.org

SEM micrograph (BSE) mode of a polished section of an silver ore sample, found in 1980, containing dark red, partly As-rich pyrargyrite droplets disseminated a matrix of colourless quartz. The picture shows, on the left, an Sb-rich cupropearceite grain (bright grey), associated with two pearceite grains (slightly brighter grey, below and at 1 o'clock above centre), intergrown with chalcopyrite (dark grey), all in a matrix of tennantite-(Fe) (grey). The Cu-richest of the several cupropearceite grains detected in this polished section has the composition [Cu4.14Ag1.86(As,Sb)2S7][Ag9CuS4]. This photo was originally published in: Kolitsch, U., Bayerl, R. and Topa, D. (2019): Neufunde aus der Grube Clara im mittleren Schwarzwald (V). Mineralien-Welt 30 (3), 12-27 (in German).
Uwe Kolitsch - 25th May 2019

Photo added to mindat.org

SEM micrograph (BSE) mode of a polished section of an silver ore sample, found in 1980, containing dark red, partly As-rich pyrargyrite droplets disseminated a matrix of colourless quartz. The picture shows tiny grains (bright grey) of Sb-bearing jordanite in baryte. This photo was originally published in: Kolitsch, U., Bayerl, R. and Topa, D. (2019): Neufunde aus der Grube Clara im mittleren Schwarzwald (V). Mineralien-Welt 30 (3), 12-27 (in German).
Uwe Kolitsch - 25th May 2019
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