Which type of opal is your favorite? Opal is one of October’s birthstones, and is revered around the world for its beautiful play of color and uniqueness. Opal jewelry pieces shown: Black opal: am25496 Semi-black opal: ad26153 Crystal opal: rd82270 Semi-crystal opal: wr25604 White opal: ac92916 Boulder opal: ab61466 Cantera opal: ab75966 Mexican fire opal: ax82574 Ethiopian opal: wr26314 #octoberbirthstone #opal #opalring #opaljewelry | EraGem

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