Boulder Opal in Ironstone
Locality: Yaraka opal mine in Queensland, Australia.
Size:57.9 x 28.9 mm / 2.27" x 1.13".
Gem Boulder Opal in Brown Ironstone Matrix
Locality: Quilpie Shire, Queensland, Australia.
Size: 4.5 cm by 6.6 cm by 2.8 cm