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Fig. 4

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Aspect des oxydes du minerai (microscope par réflexion, lumière polarisée non analysée) ; abréviations des noms de minéraux d’après Warr (2021). (a) Cassitérite (gris, Cst) disséminée dans chlorite (matrice sombre) avec bornite (brun, Bn) et chalcopyrite (jaune, Ccp) ; (b) Amas de cristaux de cassitérite (gris, Cst) avec bornite (brun, Bn) et chalcopyrite (jaune, Ccp) ; (c) Cassitérite (gris, Cst) et anciens cristaux automorphes de magnétite transformés en hématite (gris clair, Hem) avec bornite (brun, Bn) et chalcopyrite (jaune, Ccp) ; (d) Anciens cristaux subautomorphes de magnétite transformés en hématite (gris clair, Hem) dans bornite (brun, Bn), chalcopyrite (jaune, Ccp), et wittichénite (petites plages allongées gris-blanc) ; (e) Hématite automorphe (gris, Hem) dans bornite (brun, Bn) avec chalcopyrite (jaune) et liseré bleu de covellite.

Aspect of ore oxides (reflection microscope, unanalyzed polarized light); abbreviations of mineral names from Warr (2021). (a) Cassiterite (grey, Cst) disseminated in chlorite (dark matrix) with bornite (brown, Bn) and chalcopyrite (yellow, Ccp); (b) Cluster of cassiterite crystals (grey, Cst) with bornite (brown, Bn) and chalcopyrite (yellow, Ccp); (c) Cassiterite (grey, Cst) and ancient automorphic crystals of magnetite transformed into hematite (light grey, Hem) with bornite (brown, Bn) and chalcopyrite (yellow, Ccp); (d) Ancient subautomorphic crystals of magnetite transformed into hematite (light grey, Hem) in bornite (brown, Bn), chalcopyrite (yellow, Ccp), and wittichenite (small elongated grey-white patches); (e) Automorphic hematite (grey, Hem) in bornite (brown, Bn) with chalcopyrite (yellow) and blue border of covellite.

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