Opal - Mineral Specimen green crystal Approximate Width of 1 piece:

Approximate Width of 1 piece: 1

and also filter feeders

4mmHead Length: 13mmShaft Diameter: 2

Approximate Size of 1 Piece: 8cm x 5cm x 2

Opal - Mineral Specimen green crystal Approximate Width of 1 piece:Mined from: Coober Pedy, South Australia, Australia Description: This Australian opal is shown in rough form, still partially embedded in its host rock, with a mix of pale blue grey translucent silica and earthy red brown ironstone staining. The surface shows natural weathering and pitting, with areas of exposed opal displaying a waxy to slightly glassy luster. Subtle internal color shifts are visible in the cleaner sections, with faint hints of blue