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The spectacular display of colors these specimens display can be formed by two different geological processes: the oxidation of pyrite causing ultra-thin layers of iron oxide to form on the surface
Fluorite crystals are well shaped
it is instead formally known as botryoidal purple chalcedony
Aquamarine is a form of Beryl crystal long sought after as a gem and precious stone due to its beautiful blue-green hue and clarity
Iceland Spar with Chalcopyrite Iceland Spar The spectacular display of colors
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