File:Millerite-chalcopyrite-calcite (Sudbury Impact-related mineralization, late Paleoproterozoic, 1.85 Ga; McCreedy West Mine, Sudbury Mining District, Ontario, Canada) 1 (15753817870).jpg
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Millerite-chalcopyrite-calcite from the Precambrian of Ontario, Canada (6.3 cm across at its widest). The Sudbury Complex (Sudbury Basin) in southeastern Canada has intrigued geologists for decades, and not just due to the tremendous economic value of the area’s mineral deposits. Sudbury is one of the largest preserved impact structures on Earth. The impact occurred ~1.85 billion years ago, during the late Paleoproterozoic. The Sudbury Impact Structure is no longer circular or subcircular in shape, however - it's been compessed into a stretched-egg shape from an ancient continental collision event. This vein rock is composed of chalcopyrite (CuFeS2 - copper iron sulfide; = deep yellow brassy material at right and scattered elsewhere), millerite (NiS - nickel sulfide; = grayish-looking material at center and bottom & white-lustrous material at left of center), and calcite (CaCO3 - calcium carbonate; = whitish-gray material at far left & far top). Millerite usually forms long, hair-like crystals in geodes. The Sudbury Mining District has some nickel ores with massive, even rock-forming millerite. This photo doesn't faithfully show the color of the millerite - it's actually a bright brassy color (photographing metallic-lustered minerals is notoriously difficult). Geologic context & mineralization age: massive sulfide vein in greenish alteration zone rock (= hidden on back side of this specimen), Sudbury Impact Structure, mineralization likely syn-impact or early post-impact, late Paleoproterozoic, 1.85 Ga Locality: McCreedy West Mine (a.k.a. Levack West Mine), ~1 km southwest of the town of Levack, northwest of the city of Sudbury, northwestern Sudbury Mining District, southeastern Ontario, southeastern Canada (46° 38' 10" North, 81° 23' 60" West) |
| Date | |
| Source | Millerite-chalcopyrite-calcite (Sudbury Impact-related mineralization, late Paleoproterozoic, 1.85 Ga; McCreedy West Mine, Sudbury Mining District, Ontario, Canada) 1 |
| Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/15753817870 (archive). It was reviewed on 10 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 01:12, 10 October 2019 | | 2,520 × 2,448 (2.18 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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