スミソニアン博物館のインスタグラム(smithsonian) - 11月29日 06時13分

It looks like a sunset landscape, but this is a piece of petrified wood in our @smithsoniannmnh's collection.
It's from Arizona, where silica-rich groundwater permeated the wood with fine-grained quartz. What started as living matter is now nearly all quartz.
Impurities in the quartz (like iron and carbon) produce colors in the petrified wood.

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