スミソニアン博物館のインスタグラム(smithsonian) - 9月6日 05時38分

This is a piece of petrified wood. 😲
It's in our @smithsoniannmnh's collection and 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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