Petrified Spruce Wood — Visible Growth Rings
Miocene to Pliocene (approx. 23-2.6 million years ago), Oregon, USA
Session begins in
July 14, 02:00 PM GMT
Estimate
8,000 - 12,000 USD
Bid
5,000 USD
Lot Details
Description
Petrified Spruce Wood — Visible Growth Rings
Picea sp.
Miocene to Pliocene (approx. 23-2.6 million years ago)
Oregon, USA
37 x 36¼ x ¾ inches (94 x 92.1 x 1.9 cm). 110 pounds (49.9 kg).
This cross section of mineralized wood is in very good condition. This large example is cut and polished to reveal its inner beauty. The growth rings are preserved in exquisite detail capturing the development of this ancient tree. It is a textbook example with decorative appeal.
Petrified wood is formed by the invasion of minerals into cavities within and between the cells of natural wood, usually silica (SiO2) or calcite (CaCO3). The petrified forests of the western United States are silicified wood, the tree tissues having been replaced by chalcedony (cryptocrystalline quartz). Often this replacement is so accurate that the internal structure as well as the external shape is faithfully represented; sometimes even the cell structure can be seen.
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