File:Anorthosite (Ankafotia Anorthosite Massif, Neoproterozoic, ~660 Ma; Madagascar) 14.jpg
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| Description |
English: Anorthosite from the Precambrian of Madagascar.
Anorthosite is a coarsely-crystalline, intrusive igneous rock dominated by plagioclase feldspar. Pyroxene and other minerals are often present in minor amounts. Anorthosite is an uncommon rock on Earth, but is abundant on the Moon. The sample seen here has large crystals of labradorite, a type of plagioclase feldspar that often shows a rainbow play of colors (see elsewhere in this photostream). Minor hornblde and pyroxene are also present. I'm referring to the rock as an anorthosite, but it's really a coarsely-crystalline plagioclasite, a metamorphic rock. The original anorthosite has been subjected to multiple metamorphic events. Granulite-facies metamorphism has occurred, but the igneous texture and mineralogy are still preserved (although the plagioclase feldspar is slightly recrystallized). Geologic unit: Ankafotia Anorthosite Massif, ~mid-Neoproterozoic, 660±60 Ma; metamorphosed at 630-650 Ma & 627 Ma & 607-609 Ma & 520-600 Ma Locality: unrecorded, but likely from a commercial quarry at Benonoky, southern Toliary Province, southern Madagascar |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/50421483421/ |
| 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@N05/50421483421. It was reviewed on 9 October 2020 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 | 06:01, 9 October 2020 | | 3,063 × 2,034 (4.36 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50421483421/ with UploadWizard |
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