File:Emeralds-garnets-tourmaline in pegmatitic granite (Crabtree Pegmatite, Devonian; Crabtree Mountain, Mitchell County, North Carolina, USA) 4 (27237625549).jpg

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Pegmatite from the Devonian of North Carolina, USA.

Pegmatites are intrusive igneous rocks consisting of very large crystals (defined as >1 centimeter). They can form by very slow cooling of magma or cooling of a water-rich magma. Most pegmatites form by the latter.

The rock shown here is from North Carolina's famous Crabtree Pegmatite, which produces emeralds (= green specks). In this shot, the elongated and subtriangular, black crystals are schorl tourmaline (a complex silicate), the pinkish-reddish crystals are garnet, the medium brownish-gray, glassy material is quartz (SiO2 - silica), and the whitish-gray is feldspar.

This is one of many pegmatites that have intruded metamorphic rocks of the Precambrian-aged Ashe Formation.

Geologic unit: Crabtree Pegmatite, Spruce Pine Plutonic Suite, Gossan Lead Thrust Block, eastern Blue Ridge Mountains, Devonian, ~377 to 404 Ma

Locality: subsurface mine at Crabtree Mountain, ~2.5 km northwest of Little Switzerland & ~7.5 km southwest of Spruce Pine, Spruce Pine District, southern Mitchell County, western North Carolina, USA (~35° 52' 30" North latitude, ~82° 07' 20" West longitude)
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Source Emeralds-garnets-tourmaline in pegmatitic granite (Crabtree Pegmatite, Devonian; Crabtree Mountain, Mitchell County, North Carolina, USA) 4
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@N05/27237625549 (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.

12 November 2019

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current04:16, 12 November 2019Thumbnail for version as of 04:16, 12 November 20193,426 × 2,789 (6.79 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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