Grunerite (pale green-brown and with high Interference colors), quartz and garnet (with black inclusions arranged as "wheel-spoke"). Metamorphosed (amphibolite facies) iron-rich rocks. South-central Maine (U.S.A). Thanks to David P West for the sample. #thinsection #grunerite https://t.co/mmjQXl3dT7
— Alexstrekeisen (@alexstrekeisen) Jan 4, 2022
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January 05, 2022 at 12:50AM
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