mineralists:

“Petrified cross section of Chromium colored wood (Araucarioxylon arizonicum) ~ Winslow, Navajo County, Arizona ~ this Conifer tree existed between 65 and 200 million years ago during the Triassic Era. When the tree died and was becoming petrified, it became exposed to the mineral Chromium (same mineral which colors Emeralds).”

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