Template:POTD protected/2011-01-10

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A polished sample of opal, a mineraloid gemstone that occurs in the fissures of almost any kind of rock, being most commonly found with limonite, sandstone, rhyolite, marl and basalt. Opal comes in a wide variety of colors, with red against black being the most rare, whereas white and green are the most common.

Photo: Noodle snacks

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