Dendritic Black Opal 6mm Round 15-16 Inch Cacao Petrified Wood Agate is formed

Petrified Wood Agate is formed from the petrifaction process of primeval trees over the course of many years

near the Kennedy Ranges of Australia

Once cooled

This lava rolled across the landscape

Preservation is enabled by a lack of oxygen

Dendritic Black Opal 6mm Round 15-16 Inch Cacao Petrified Wood Agate is formedThis variety of opal is named "dendritic" for the small inclusions within it that resemble moss or ferns. These inclusions consist of iron, manganese and other metallic oxides captured during the forming of the rock. Opals are hydrated amorphous forms of silica, created when silica hardens within the fissures of other stones.