File:Muscovite mica & biotite mica derived from pegmatitic granite (Ruggles Pegmatite, Devonian; Ruggles Pegmatite Mine, New Hampshire, USA) 2 (8291623278).jpg
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Muscovite mica & biotite mica derived from pegmatitic granite in the Devonian of New Hampshire, USA. Black = biotite mica Clearish-silvery = muscovite mica Spectacular mineral collecting can be had at the Ruggles Pegmatite Mine near Grafton, New Hampshire, USA. The Ruggles Mine started off in the early 1800s as a muscovite mica mine, but it's now a tourist site. Its walls have beautiful exposures of a mid-Paleozoic granite pegmatite, having unbelievably large crystals. Well over 100 minerals have been reported from this pegmatite, but the most common rock-forming minerals here are quartz, potassium feldspar, biotite mica, muscovite mica, and schorl tourmaline. The Devonian-aged pegmatite at Ruggles Mine is one of several in the Grafton Pegmatite Field. These intrusions are part of the New Hampshire Plutonic Series, emplaced during the Acadian Orogeny. One of the most visually intriguing aspects of the Ruggles Pegmatite is the huge masses of both biotite mica and muscovite mica. Both types of mica litter the ground at the Ruggles Mine. Numerous specimens can be collected in a few minutes. Locality: Ruggles Pegmatite Mine, near Grafton, southern Grafton County, western New Hampshire, USA |
| Date | |
| Source | Muscovite mica & biotite mica derived from pegmatitic granite (Ruggles Pegmatite, Devonian; Ruggles Pegmatite Mine, New Hampshire, USA) 2 |
| 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@N05/8291623278 (archive). It was reviewed on 12 November 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 04:15, 12 November 2019 | | 960 × 569 (485 KB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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