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Opal is made of silica, but it technically is not a mineral.

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10y ago

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What is geyserite?

Geyserite is a type of siliceous sinter, a form of opaline silica that is deposited around geysers and hot springs. It forms when hot water dissolves silica underground and then brings it to the surface where it precipitates out as the water cools, creating a characteristic white to gray mineral deposit. Geyserite can often be found encrusting the edges of geyser basins and pools.


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