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Glaucophane | by only_point_five
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Glaucophane

Glaucophane (violet-blue) with epidote (slightly yellow) and quartz (colorless) in a blueschist. In the center of the photo you can see a basal section of a glaucophane mineral grain, showing two cleavage directions with the typical 120° angle.

 

Photomicrograph taken with a petrographic microscope in plane-polarized light at a medium magnification.

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Taken on January 11, 2010