October Birthstone: Opal

October has the privilege of two birthstones: tourmaline & opal. Today, we’re focusing on opals, which are the more traditional of the two. Opals are formed in fissures of pretty much any rock, but most commonly limonite, sandstone, rhyolite, marl and basalt. It’s a mineral gem deposit that forms at relatively low temperatures, and it’s…
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