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Before I left the Mineralogy section of the Carnegie Museum of Natural History in Pittsburgh, Pennsylvania, I took a few photographs in the darkness of some of my favorite crystals. The dark ones on variations on Flourite the others unknown.

Click on the images below for a larger view:

ISO 1600, F/4, 1/60 sec, 67 mm Lens

ISO 1600, F/4, 1/60 sec, 67 mm Lens

ISO 1600, F/4, 1/60 sec, 67 mm Lens

ISO 1600, F/4, 1/60 sec, 67 mm Lens

ISO 1600, F/4.5, 1/90 sec, 73 mm Lens

ISO 1600, F/4.5, 1/90 sec, 73 mm Lens

ISO 1600, F/4.5, 1/125 sec, 96 mm Lens

ISO 1600, F/4.5, 1/125 sec, 96 mm Lens

These light green frosted crystals were breathtaking:

ISO 1600, F/5.6, 1/180 sec, 88 mm lens

ISO 1600, F/5.6, 1/180 sec, 88 mm lens

ISO 1600, F/5.6, 1/125 sec, 58 mm lens

ISO 1600, F/5.6, 1/125 sec, 58 mm lens

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