Opal (rare locality) (39.29 ct) - Spencer Opal Mine, Spencer, Clark Co., Idaho, USA More info: https://www.irocks.com/minerals/specimen/53276 Not all opals come from halfway across the world—sometimes, a true rarity is found right here in the USA. This is one of the rarest of USA origin opals, and comes from the important collection of USA-origin gemstones of Jim Houran, who spent decades scouring the country for the finest location gemstone examples that could match his exacting criteria. When

Sue from @brokenrivermining presents: Opal Fossils with Unpreserved Internal Details Opal formation commences when silica dissolves in water. At our Russell’s opal mine we have found that this silica solution occupies a void most probably left by decaying tree roots or branches. When it solidifies it creates an opalized replica of the original object. These are also known as ‘jelly mould’ fossils. In some rare cases, like shown above, we have found large and rare opal fossil specimens with beaut