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What kind of core is this on the mica .75?


mccracken

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An unintentional core probably from contamination or (more likely in this case) chemical reaction in the glass. For some reason oxblood red shows up in aqua glass sometimes so I'd look closer and see if that's the case here

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Can't show a pic as I have to backlight using the camera phone. Opaque looks dark green with filaments on the edge. Closer to the surface of the marble than the center. Looks to me as it was intentional. There is also a thin filament that runs thru the marble middle.

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