Chromite-nickeline ore containing prismatic crystals of orthopyroxene. La Gallega Mine. Ojén Ultramafic Massif, Serranía de Ronda (Málaga, Spain)
Chromite-nickeline ore from La Gallega Mine. Ojén Ultramafic Massif, Serranía de Ronda (Málaga, Spain)
Nickeline-rich chromite-nickeline ore from La Gallega Mine. Ojén Ultramafic Massif, Serranía de Ronda (Málaga, Spain)
Nickeline- and löllingite-rich chromite-nickeline ore from La Gallega Mine. Ojén Ultramafic Massif, Serranía de Ronda (Málaga, Spain)
Partial replacement of nickeline by maucherite+westerweldite in chromite-nickeline ore from La Gallega Mine. Ojén Ultramafic Massif, Serranía de Ronda (Málaga, Spain)
Chromite-nickeline ore from La Gallega Mine cut by a fracture containing crystals of chalcopyrite and gersdorffite. Ojén Ultramafic Massif, Serranía de Ronda (Málaga, Spain)
Nickeline- and löllingite-rich chromite-nickeline ore from La Gallega Mine. Ojén Ultramafic Massif, Serranía de Ronda (Málaga, Spain)
Nickeline- and löllingite-rich chromite-nickeline ore from La Gallega Mine. Ojén Ultramafic Massif, Serranía de Ronda (Málaga, Spain)
Nickeline containing abundant pyrrhotite inclusions, partly replaced by nickeliferous löllingite. La Gallega Mine. Ojén Ultramafic Massif, Serranía de Ronda (Málaga, Spain)
Chalcopyrite-chromite and pyrrhotite-chromite layers within chromite-nickeline ores. La Gallega Mine. Ojén Ultramafic Massif, Serranía de Ronda (Málaga, Spain)
Coarse-grained pyrrhotite crystals containing minute inclusions (exsolutions) of pentlandite from a small cross-cutting sulfide vein in the La Gallega Mine. Ojén Ultramafic Massif, Serranía de Ronda (Málaga, Spain)
Pyrrhotite with interstitial chalcopyrite+cubanite from a small cross-cutting sulfide vein in the La Gallega Mine. Ojén Ultramafic Massif, Serranía de Ronda (Málaga, Spain)
Inversion twins in pyrrhorite from a small cross-cutting sulfide vein in the La Gallega Mine. Ojén Ultramafic Massif, Serranía de Ronda (Málaga, Spain)
Globular aggregate of nickeline partially replaced by maucherite+westerweldite, included in pyrrhotite from Los Jarales. Carratraca Ultramafic Massif, Serranía de Ronda (Málaga, Spain).
Sulfide-graphite ores made up of pyrrhotite, pentlandite and chalcopyrite containing graphite blades and nodules, as well as small chromite grains. El Gallego Mine, Carratraca Ultramafic Massif, Serranía de Ronda (Málaga, Spain)
Chromite ore from the Arroyo de la Cala chromitite. Ronda Ultramafic Massif (Málaga, Spain)
Merenskyite cristal included in pentlandite. Las Aguilas Ni-Cu deposit (San Luis, Argentina)
Euhedral cristal of cobaltite containing irarsite. Las Aguilas Ni-Cu deposit (San Luis, Argentina)
Merenskyite crystal at the contact between molybdenite and pyrrhotite. Las Aguilas Ni-Cu deposit (San Luis, Argentina)
Merenskyite cristal at the contact between cobaltite and graphite. This assemblage is included in pyrrhotite with flame-like exsolutions of pentlandite. Las Aguilas Ni-Cu deposit (San Luis, Argentina)
1. Replacement texture of magmatic sulfides (pyrrhotite+pentlandite) by Ni arsenides (nickeline) and sulfarsenides (gersdorffite). Kylmäkoski Mine, Vammala Nikel Belt (SW Finland)
2. Replacement texture of magmatic sulfides (pyrrhotite+pentlandite) by Ni arsenides (nickeline) and sulfarsenides (gersdorffite). Kylmäkoski Mine, Vammala Nikel Belt (SW Finland). White spots are PGM (mainly sudburyite)
3. Replacement texture of magmatic sulfides (pyrrhotite+pentlandite) by Ni arsenides (nickeline) and sulfarsenides (gersdorffite). Kylmäkoski Mine, Vammala Nikel Belt (SW Finland). White spots are PGM (mainly sudburyite)
4. Replacement texture of magmatic sulfides (pyrrhotite+pentlandite) by Ni arsenides (nickeline) and sulfarsenides (gersdorffite). Kylmäkoski Mine, Vammala Nikel Belt (SW Finland). White spots are PGM (mainly sudburyite)
5. Replacement texture of magmatic sulfides (pyrrhotite+pentlandite) by Ni arsenides (nickeline) and sulfarsenides (gersdorffite). Kylmäkoski Mine, Vammala Nikel Belt (SW Finland)
6. Replacement texture of magmatic sulfides (pyrrhotite+pentlandite) by Ni arsenides (nickeline) and sulfarsenides (gersdorffite). Kylmäkoski Mine, Vammala Nikel Belt (SW Finland). A fracture in gersdorffite is filled by pilsenite, sudburyite and electrum.
Radiated palm-like aggregates of nickeline covered several generations of rammelsbergite. Atrevida Mine (Tarragona, Spain)
Different generations of collophorm nickeline partly replaced by maucherite and overgrown by rammelsbergite. Atrevida Mine (Tarragona, Spain).
Nickeline aggregates partly replaced by maucherite and overgrown by rammelsbergite. Atrevida Mine (Tarragona, Spain).
Collophorm aggregates of nickeline partly replaced by maucherite, surrounded by gersdorffite. Atrevida Mine (Tarragona, Spain).
Collophorm aggregates of nickeline partly replaced by maucherite containing inclusions of native Ag, surrounded by gersdorffite. Atrevida Mine (Tarragona, Spain).
Crossed polars image showing the distribution of nickeline (strongly anisotropic) and maucherite (weakly anisotropic) in collophorm aggregates of both minerals, containing inclusions of native Ag. Atrevida Mine (Tarragona, Spain).
Collophorm aggregate of maucherite containing inclusions (and holes after removal of inclusions) of native silver, surrounded by collophorm nickeline with an outer rim of gersdorffite. Atrevida Mine (Tarragona, Spain).
Skeletal crystal of native silver included in maucherite. Atrevida Mine (Tarragona, Spain).
Collophorm aggregates of rammelsbergite replaced by sphalerite. Atrevida Mine (Tarragona, Spain).
Skeletal crustal of galena intergrown with sphalerite. Atrevida Mine (Tarragona, Spain).
Collophorm aggregates of nickeline and maucherite, partly dissolved and replaced by skeletal galena intergrown with sphalerite. Atrevida Mine (Tarragona, Spain).
Crossed polars image of crystal aggregates of safflorite in calcite from the Norilsk Ni-Cu deposit (Russia).
Characteristic cyclic, star-like twin of safflorite in calcite from the Norilsk Ni-Cu deposit (Russia).
Crossed polars image of crystal aggregates of breithauptite in calcite from the Norilsk Ni-Cu deposit (Russia).
Mosaic aggregate of marcasite crystals in slates from the Iberian Pyrite Belt (Huelva province, Spain)
1. Flame-like and ribbon pentlandite in pyrrhotite from the Aguablanca Ni-Cu deposit (Monesterio, Badajoz, Spain).
2. Granular and ribbon pentlandite (including secondary pyrite) in pyrrhotite from the Aguablanca Ni-Cu deposit (Monesterio, Badajoz, Spain).
3. Ribbon pentlandite surrounding pyrrhotite crystals from the Aguablanca Ni-Cu deposit (Monesterio, Badajoz, Spain). Ni-Cu ores include partly corroded crystals of pyroxene.
4. Subhedric crystals of pyrite replacing pyrrhotite in Ni-Cu ores from the Aguablanca deposit (Monesterio, Badajoz, Spain).
5. Chalcopyrite and granular pentlandite interstitial among pyrrhotite from the Aguablanca Ni-Cu deposit (Monesterio, Badajoz, Spain).
6. Ribbon-like alteration of pyrrhotite to marcasite in Ni-Cu ores from the Aguablanca deposit (Monesterio, Badajoz, Spain).
1. Partly altered chromite included in skutterudite from serpentinite-hosted Co-Fe ores from the Aghbar Mine (Bou Azzer, Morocco).
2. Partly altered chromite and chlorite included in skutterudite from serpentinite-hosted Co-Fe ores from the Aghbar Mine (Bou Azzer, Morocco).
3. Partly altered chromite included in skutterudite from serpentinite-hosted Co-Fe ores from the Aghbar Mine (Bou Azzer, Morocco). Note the presence of a small, partly cataclastized chromitite in the serpentinite.
4. Partly altered chromite interstitial and included in skutterudite from serpentinite-hosted Co-Fe ores from the Aghbar Mine (Bou Azzer, Morocco).
5. Zoned skutterudite crystals formed by concentric, alternating bands of chlorite-rich and chlorite-free bands in serpentinite-hosted Co-Fe ores from the Aghbar Mine (Bou Azzer, Morocco).
6. Close up of a zoned skutterudite crystal formed by concentric, alternating bands of chlorite-rich and chlorite-free bands in serpentinite-hosted Co-Fe ores from the Aghbar Mine (Bou Azzer, Morocco), showing the presence of inclusions of partly dissolved chromite in some chlorite-rich bands.
7. Partly altered chromite included in, and interstitial to skutterudite crystals in serpentinite-hosted Co-Fe ores from the Aghbar Mine (Bou Azzer, Morocco).
8. Fractured, partly altered chromite included in growing skutterudite in serpentinite-hosted Co-Fe ores from the Aghbar Mine (Bou Azzer, Morocco).
Inversion twins of krutovite to rammelsbergite from Ni-Co ores from the Aghbar Mine (Bou Azzer, Morocco).
Fracture in rammelsbergite filled by millerite. Aghbar Mine (Bou Azzer, Morocco).
Feather-like twins in rammelsbergite. Aghbar Mine (Bou Azzer, Morocco).
Zoned, spindle-like crystals of loellingite-safflorite. Aghbar Mine (Bou Azzer, Morocco).
Close up of a partly dissolved crystal of chromite included in zoned, spindle-like crystals of loellingite-safflorite. Aghbar Mine (Bou Azzer, Morocco).
1. Covellite and minor chalcocite from the supergene alteration zone of sulfide ores from Bou Azzer (Morocco).
2. Covellite and minor chalcocite from the supergene alteration zone of sulfide ores from Bou Azzer (Morocco).
3. Covellite and minor chalcocite from the supergene alteration zone of sulfide ores from Bou Azzer (Morocco).
4. Covellite and minor chalcocite from the supergene alteration zone of sulfide ores from Bou Azzer (Morocco).
5. Covellite and chalcocite from the supergene alteration zone of sulfide ores from Bou Azzer (Morocco).
6. Covellite and chalcocite from the supergene alteration zone of sulfide ores from Bou Azzer (Morocco).
7. Covellite and chalcocite from the supergene alteration zone of sulfide ores from Bou Azzer (Morocco).
8. Covellite and chalcocite from the supergene alteration zone of sulfide ores from Bou Azzer (Morocco).
1. Concentric aggregate of manganite crystals from El Gavilán Mine (Baja California, México).
2. Collophorm aggregate consisting of bands of manganite and psilomelane (± hollandite) from El Gavilán Mine (Baja California, México).
3. Collophorm aggregate consisting of bands of manganite and psilomelane (± hollandite) from El Gavilán Mine (Baja California, México).
4. Crossed polars image of the previous collophorm aggregate consisting of bands of manganite and psilomelane (± hollandite) from El Gavilán Mine (Baja California, México).
5. Collophorm bands of manganite and psilomelane (± hollandite) from El Gavilán Mine (Baja California, México).
6. Crossed polars image of the previous collophorm bands of manganite and psilomelane (± hollandite) from El Gavilán Mine (Baja California, México).
7. Superimposed bands of psilomelane and hollandite forming stromatolite-like structures. El Gavilán Mine (Baja California, México).
8. Superimposed bands of psilomelane and hollandite forming stromatolite-like structures. El Gavilán Mine (Baja California, México).
