File:Rock sample made of Quartz, Feldspar and Tourmaline (8201738090).jpg

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Feldspar and Quartz are the two most common minerals in the Earth's crust. Here, Tourmaline adds a touch of class. Coarse-grained grey quartz + white feldspar + black tourmaline pegmatite crosscutting what appears to be a fine-grained to porphyritic diorite, Canadian Museum of Nature, Ottawa, Ontario, Canada

Pegmatites have the ability to collect a bunch of elements, making them the "garbage cans" of the Earth. Complex, zoned pegmatites in Brazil, California, Maine and elsewhere are mined for mineral specimens and gemstones. However, quartz-feldspar-mica pegmatite is by far and away the most typical intrusion.

For a fabulous flickr foto introduction to rocks, do have a look at my Geology ABCs gallery www.flickr.com/photos/31856336@N03/galleries/721576239751...
Date
Source QFT
Author Mike Beauregard from Nunavut, Canada
Camera location45° 24′ 46.51″ N, 75° 41′ 18.81″ W Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMapinfo

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This image was originally posted to Flickr by subarcticmike at https://www.flickr.com/photos/31856336@N03/8201738090. It was reviewed on 31 August 2014 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

31 August 2014

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current22:02, 31 August 2014Thumbnail for version as of 22:02, 31 August 20142,400 × 2,043 (2.83 MB)Geo Swan (talk | contribs)Transferred from Flickr via Flickr2commons

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