African Petrified Wood Agate 6x8mm Corner Drilled Table Cut Cube Bead - 15-16 Inch dec14 Black Opal is a naturally

Black Opal is a naturally occurring variety of precious opal mined in Australia

These pearl strands can vary slightly in length and the pearl beads can vary in shape

First described in 1881

or merlinite

Dumortierite is an aluminum borosilicate mineral that varies in color from blue

African Petrified Wood Agate 6x8mm Corner Drilled Table Cut Cube Bead - 15-16 Inch dec14 Black Opal is a naturallyPetrified Wood Agate is formed from the petrifaction process of primeval trees over the course of many years. Petrification occurs when the wood is covered by sedimentary rock, as waters loosen and decompose the organic elements and replace them with silicate substances, while maintaining the wood's original structure. Preservation is enabled by a lack of oxygen.