Blue Opal 4mm Microfaceted Round - 15-16 Inch Store Promotions which may form green stains

which may form green stains or specks on Azurite crystals or aggregates

and this phenomenon is thought to be due to impurities of yttrium or organic matter within the crystal lattice

It is an opaque stone

Most hemimorphite is found in the rocks above and surrounding zinc deposits

Blue Opal 4mm Microfaceted Round - 15-16 Inch Store Promotions which may form green stainsBlue Peruvian Opal naturally occurs with swirling patterns of deep blues, blue to greens and greens swirled with yellow to green, rust, brown and orange. It is highly prized for its beautiful combinations of colors and for its opalescence the pearly luster of the opaque stone. Peruvian Opal was considered by the Incas to be a gift from Pachamama, the Inca Goddess of Fruitfulness and Mother Earth.