• OPAL Var. “BOULDER OPAL” in IRONSTONE
  • OPAL Var. “BOULDER OPAL” in IRONSTONE
  • OPAL Var. “BOULDER OPAL” in IRONSTONE
  • OPAL Var. “BOULDER OPAL” in IRONSTONE
  • OPAL Var. “BOULDER OPAL” in IRONSTONE
  • OPAL Var. “BOULDER OPAL” in IRONSTONE
Classic Minerals

OPAL Var. “BOULDER OPAL” in IRONSTONE

$6,500.00   €5,862  £5,360.00 approx.  

This specimen is priced in US dollars, all other prices are approximate.

ID: CC10547
A stunning specimen of the Opal variety known as “Boulder Opal” from one of the less well-known Australian opal localities of Quilpie in southern Queensland, Australia.  The siliceous ironstone matrix varies from milk chocolate to dark chocolate-brown and is part of a larger concretion which has fractured internally at some stage of its formation, similar to a septarian nodule.  In this case, the fracture filling has been a colloidal silicate gel leading to the formation of Opal.  The specimen has been sawn to form a base and is highly polished on all faces.  The display face is a spectacular network of polygonal facture infillings of electric blue and green Opal with a major opalized area of approximately 6.5 x 4 cm.   The Opal is predominantly vivid shades of blue, mauve, violet and green, but shows occasional bright flashes of orange-red.  A thoroughly excellent example of “Boulder Opal” from Queensland and of high-end museum quality.

Details

Dimensions
9.4 × 8.8 × 3.6 cm
Categories
Classic Minerals, Gem Minerals
Locality
Quilpie, Queensland, Australia, Oceania

Minerals on Specimen

Minerals on specimen