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Old 9th September 2021, 01:08
Makko Mexico Makko is offline
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Join Date: Apr 2017
Location: Mexico City, Mexico
Posts: 948
David,
It is probably MICA, used as a semitranslucent window pane by the Aztecas. It is also a dielectric and, being sedimentary in creation, is easily split into panels.
Rgds.
Dave
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