I'm interested in petrified wood for both the scientific value (wood where the cell structure is well preserved) and for the aesthetic value (mineralized with vivid colors and crystal shapes). Below are two petrified wood slabs from my collection.
Black (carbon) and White (silica) Slab:
Below are some close-up pictures taken with my digital microscope that show the wood structure in this black and white petrified slab:
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Marco Sr.