An Oak Barite cabochon from Derbyshire, England, UK.
Also known as Derbyshire Oakstone, this stone is a rare Barium Sulfate mineral, chemical formula BaSO4.
It is characterised by its concentric ring pattern of microcrystalline material which resembles the oak wood from which it takes its name.
weight: 31.41 carats
shape: Oval cabochon
dimensions: 28.42 x 17.92 x 4.80 mm