File:Carbonatite breccia (Fen Complex, Ediacaran-Early Cambrian, 523-601 Ma; near Ulefoss, Norway) 3.jpg
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English: Carbonatite breccia from the Precambrian-Cambrian of Norway.
Carbonatites are essentially “igneous limestones”. That's pretty odd when you think about it. Carbonatites are rare igneous rocks - some are intrusive (formed deep underground by relatively slow cooling of magma), but some are demonstrably extrusive (formed at the Earth's surface by relatively quick cooling of lava). They are principally composed of carbonate minerals (hence the term "carbonatite"), including calcite (CaCO3 - calcium carbonate), dolomite (CaMg(CO3)2 - calcium magnesium carbonate), siderite (FeCO3 - iron carbonate), and sodium & potassium carbonate minerals. Carbonatites composed of calcite are called calciocarbonatites. Those with sodium-rich carbonate minerals are natrocarbonatites. Examples with a significant dolomite component are magnesiocarbonatites. If a significant siderite component is present, they're called ferrocarbonatites. Calciocarbonatites are the most common variety - they tend to be very coarsely crystalline. An alternate rock name for calciocarbonatite is sövite. Seen here is a rare vintage sample from the protected Fen Carbonatite Complex in southern Norway. The moderate-sized to large dark-colored areas are phlogopite mica crystals. Geologic unit: Fen Carbonatite Complex, Ediacaran to Early Cambrian, 523 to 601 Ma Locality: unrecorded locality in the Fen Complex, south of Nordsjø Lake (Norsjø Lake) & ~southeast of the town of Ulefoss, southern Norway |
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| Source | https://www.flickr.com/photos/47445767@N05/50568116622/ |
| 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@N05/50568116622. It was reviewed on 20 November 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 15:32, 20 November 2020 | | 3,652 × 1,930 (3.96 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50568116622/ with UploadWizard |
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