...Daniel E. Harlov Abstract Ag-Cu exchange equilibria between alpha -miargyrite AgSbS 2 and pyrargyrite Ag 3 SbS 3 and between chalcostibite CuSbS 2 and both pyrargyrite and high-skinnerite Cu 3 SbS 3 are reported for the temperature range 150-350 degrees C. All of these features are constrained...

... as the phase reported as pure Sb metal by previous investigators of the Cu‐Sb‐S system. Sb metal was interpreted by these investigators to form by subsolidus breakdown of tetrahedrite or skinnerite. A textural and compositional examination of liquidus and subliquidus phase relations on the join Cu 2 S‐Sb 2 S 3...

...Sven karup-Møller; Emil Makovicky Abstract A new mineral. skinnerite (Cu 3 SbS 3 with minor amounts of silver), is identical with synthetic Cu 3 SbS 3 (the B'phase of Skinner, Luce, and Makovicky, 1972). A reversible phase transfoimation takes place in both materials at about l22°C.The high...

..., associated with skinnerite, chalcostibite, famatinite, tetrahedrite-(Fe) and zoned aggregates of tennantite-(Cu) to tennantite-(Fe). Tetrahedrite-(Cu) is steel-grey, with a metallic lustre. Mohs hardness is ca . 3½–4 and calculated density is 5.029 g.cm –3 . In reflected light, tetrahedrite-(Cu) is isotropic...

...Figure 6. Crystal structures of wittichenite ( a ), skinnerite ( b ), and Li 3 SbS 3 ( c ) as seen down b . (Color online.) ...

... with galena and tetrahedrite, as evidenced from experimental studies in the ternary system PbS–Cu 2 S–Sb 2 S 3 (Pruseth et al ., 1997 ). Skinnerite (Cu 12 Sb 4 S 12 ), which exists in equilibrium with the Cu 2 S-rich melt has a composition very similar to that of tetrahedrite [Cu 6 (Cu 4 Cu 2 )Sb 4 S 12 S...

... of phases such as chalcostibite and skinnerite can be explained by the extremely low sulfur fugacity values, beyond the Bartonian f (sub S 2 ) -T regime, that are essential for their stability. GeoRef, Copyright 2006, American Geological Institute. Abstract, Copyright, Society of Economic Geologists 1997 ...

... skinnerite (Cu 3 SbS 3 ) from their end-member component sulfides (Cu 2 S and Sb 2 S 3 ) were determined to be −20.2 ± 2.1 kJ·mol −1 and −24.8 ± 2.7 kJ·mol −1 , respectively. Mixtures of solid Cu 2 S and liquid Sb 2 S 3 at 895 K were studied by solid-liquid reaction calorimetry, and by dilution calorimetry...

...,As)S 4 ; luzonite Cu 3 (As,Sb)S 4 ; chalcostibite, Cu(Sb,As)S 2 ; high-skinnerite, Cu 3 (Sb,As)S 3 ; compound A, Cu 24 (As,Sb) 12 S 31 ; and the solid solution series tennantite-tetrahedrite, Cu (sub 12+X) (As,Sb) (sub 4+Y) S 13 . The composition volume for tennantite-tetrahedrite is complex...

... and skinnerite. In reflected light, bytízite is grey with a yellowish hue and weak bireflectance. Pleochroism is weak. Anisotropy under crossed polarisers is strong ( Fig. 1 ), with grey to brownish rotation tints. Internal reflections were not observed. Reflectance percentages for the four Commision on Ore...

.... Electron microprobe analysis gave Cu 52.36, Zn 2.39, Fe 1.78, As 16.64, Sb 0.74, S 27.01; sum 100.92 wt%, corresponding to (Cu 2.97 Zn 0.13 Fe 0.11 ) ∑3.21 (As 0.79 Sb 0.02 ) ∑0.81 S 2.98 , simplified as Cu 3 AsS 3 . An associated mineral identified as skinnerite-like occurs as irregular to oval grains, up...

... values for reaction (I) were plotted in the log aS2 -T space (Fig. 2) along with the sulfidation curves for tetrahedrite/skinnerite, galena, pyrrhotite! pyrite, bournonite and chalcopyrite. DISCUSSION The univariant line representing the sulfidation reaction (td + po) + gn + 82 = bnt + cpy, has a high...

...(St), Skinnerite (Sk), Owyheeite (Ow), Tetrahedrite (Tt), Tenantite (Tn), Thalcusite (Th), Twinnite (Tw), Ulmanite (UI), Native Bismuth (NBi), -o:Z< and Manganoan Fahlore (Mnp). 'D 'D (lO tVI. FRErBERGITE FROM POLYMETALLIC SULPHIDE DEPOSITS, RAJASTHAN 545 Fig.I. Freibergite CFr) at the margin...

... < 0.27: Skinner et al. 1972 ). Tetrahedrite breaks down at 543°C to digenite (Cu 9 S 5 ) + famatinite (Cu 3 SbS 4 ) + skinnerite (Cu 3 SbS 3 ). Skinnerite, which has a composition close to that of tetrahedrite, melts at 608°C ( Skinner et al. 1972 ). Unlike the other ternary systems described...

... ), all common at Hemlo, compared to the other sulfosalts ( Harris, 1989 ), would have produced melt if they all existed prior to peak metamorphism. Note that the end members, tetrahedrite (Cu 12 Sb 4 S 13 ) and freibergite (Ag 12 Sb 4 S 13 ), are considered to be analogous to skinnerite (Cu 3 SbS 3 ; T m...