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Geology, Palaeontology & Archaeology / Re: What is the formation inside this geode?
« on: 27/07/2017 15:43:06 »
The top picture shows what appear to be two additional crystalline minerals (white and dark brown). I can't tell from the picture what they are, but the crystal shape doesn't look like quartz (amethyst etc.) to me. It could be that one (or both) of these minerals is more valuable than amethyst. It could also be that the inclusion makes the geode more unusual (rarer), and the dealer thought it might attract a higher price than the typical geode.
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