Set of tumbled wood as pictured. Green mineralisation is likely caused by Chromium and Manganese compounds.
Beautifully polished sections of Oak tree hardwood, prepared to a glass like finish by tumbling for a week in a big rock tumbler. The result is an amazing hand held piece of history.
Polished Fossil Hardwood (Oak), 33.9 – 23 MYO (Oligocene age), Oregon, USA.
5.2cm wide largest