Feldspars with intergrown graphite

This image tells of a geological event half a billion years ago, when extreme heat deep within the Earth gave rise to this crystal formation of quartz and feldspar. This rock, from a working quarry in Kerala, India, was studied with colleague Satish Kumar. Petrographic section observed by polarized light microscopy.
September 14, 2023

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Submitted by: Bernardo Cesare, University of Padova, Padova, Italy