4x6 mm Dendritic Opal Table Cut Corner Drilled Cube - 15-16 Inch birthstone_turquoise although sometimes mistaken for Jasper

although sometimes mistaken for Jasper

These druzy collars are part of a hand-picked collection unlike anything we'd seen available before

It won 1st price and has been used ever since in sculpture

milky to pink silicon dioxide mineral

4x6 mm Dendritic Opal Table Cut Corner Drilled Cube - 15-16 Inch birthstone_turquoise although sometimes mistaken for JasperThis 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.