Aussie ABC: O is for Opal!
Australian Opal I didn’t understand all the fuss about SiO2.nH2O until 2004. That’s when I first visited Coober Pedy. It’s slap bang in the middle of absolutely freakin’ nowhere in the South Australian Outback. And it’s where I first found a piece of SiO2.nH2O I wanted to take home with me. You might know SiO2.nH2O better as Hydrous Silica. Or[…]
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