Dog Tooth Calcite
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This composite picture is of some dog tooth calcite which came from Minas de Gerais, Brazil fluorescing when illuminated with ultraviolet light. Click on the picture and it will enlarge.
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This is a link to a high resolution copy of the same picture: http://farm3.static.flickr.com/2301/2218840702_ac31be4a27_o.jpg
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