Glaucophane in plane polarized and cross polarized light, showing blue to nearly colorless pleochroism. Cross-polars also show birds-eye extinction in phengite (muscovite).
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Sponsored by ESICE and funded by the NSF, we explore the mineral history of the Eastern Sierras in and around the Owens and Long Valley. To hear more about our region, go to roadsideheritage.org
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