Natural Very Rare Large Unique Boulder Opal Wood Replacement Fossil Specimen Pair with Polished Faces/Rough backs. Rare wood replacement fossil – opalized wood – a mineral specimen which shows one slim branch / stick around 60 million years old. This piece of wood got replaced by minerals so ever slowly over the years and turned into Opal & Opal potch. A special offer in my store as this length is very rare to find. This Opal was found around 25 years ago! With Green, some Blue & Orange colours. Erfect for a fossil display and any Opal collector. Locality: SW Queensland, Australia. Boulder Opal size pair together: 120mm x 103mm x 48mm approx at widest points. You will receive the exact pieces photographed. Specimen will come in a name labelled box.