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Posted in response to Nichola Salmon's Rock in the Photo Gallery from John on September 09, 2013 at 22:18:40:

Re: Nichola Salmon's Rock in the Photo Gallery

I'm not questioning your identification, I'm just curious: how can one tell the difference between a marbled basalt (igneous-presumably marbled at formation) and a gneiss (metamorphic) made from gabbro or diabase?

From Adelaide Tenembaum - September 11, 2013 at 21:14:25
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