This mysterious looking specimen shows an iron-rich host rock common to Koroit Opals with a patch of opal peering out from its top. These 1” thick polished blocks stand upright on flat surfaces and are made from a superior cast method for clarity, depth and realism. The print is fine art or Giclee made, and has been enlarged for a superb viewing experience. Makes a stunning showpiece on shelf, desk, table! Original Art: Old Earth Art