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7mm long x 6
Large Gumnut 7
a key component of opal
it carries the dissolved silica
Queensland Boulder Opal - Blue Tone Earring 7mm long x 6From Tall Trees Studio Solid piece of cool blue tones Queensland Boulder Opal on Ironstone. Boulder opal forms within ironstone boulders, which are concretions of iron rich sediments. The silica, a key component of opal, is released into the groundwater through the weathering of surrounding rocks, particularly sandstones and mudstones. As groundwater moves through the rock, it carries the dissolved silica. The silica rich water then seeps into cracks
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