Opal, the national gemstone of Australia, is deposited at low temperatures, and is commonly found in marl, sandstone, limonite, rhyolite and basalt, but can occur in the fissures of most any type of rock. Almost all of the world’s opals come from Australia, and South Australia produces 80% of those. The water content of the…
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Welcome to the month of October! After a long awaited 10 months, we’re here: in the midst of Football, Fall, Halloween and cooler weather on the horizon. What better way to celebrate the beginning of the month than to introduce the birthstones of October: Opal and Tourmaline. Opal is the national gemstone of Australia who…
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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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