DescriptionTourmaline-feldspar-quartz, Erongo Granite Namibia.jpg Tourmaline-feldspar-quartz from the Cretaceous of Namibia. (~2.45 cm across at its widest)...
described at URL: https://www.flickr.com/photos/jsjgeology/25807671150/ operator: Flickr URL: https://live.staticflickr.com/1557/25807671150_8cf06b178d_o.jpg...
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