Boulder Opal Wood Fossil Specimens have only recently been available
to mineral and opal collectors.
Petrified wood is common worldwide, but to find opalized
wood replacement opal is rare.
The wood grain or timber cells have been replaced by opal
over million years.
Mineral collectors have not yet discovered these are opal
Most specimens show the wood grain but some show round rings
that people think are worm holes but are Ooids orooltic.
Ooliths consist of
concentric growths around a nucleus, which may be a minute quartz grain with
Rare wood replacement specimens are hard to find in the Queensland