Dazzling and exceptional specimen of Precious Opal in Ironstone matrix! Minerals 11:48 PM A+ A- Print Email Dazzling and exceptional specimen of Precious Opal in Ironstone matrix!From Quilpie, Quilpie Shire, Queensland, Australia.Measures 4.6 cm by 8 cm by 3.2 cm in total size with a 1.4 cm by 7 cm Opal seam. The Mineral Gallery, Inc.