Stunning Boulder Opal Specimen Paleolithic Lake Superior Agates are the

Lake Superior Agates are the state mineral of Minnesota

however this term is not common when describing Ruby in "Zoisite" / Anyolite

The very first stone tools were not created by humans

The pink or reddish hue is caused by the element manganese

Stunning Boulder Opal Specimen Paleolithic Lake Superior Agates are theOpal is composed of hydrated silica. It is an amorphous silicate, meaning it does not form crystals. Opals are structurally composed of tiny spheres of silica, which when arranged in perfect geometry create the famous play of color associated with the stones. The arrangement of silica balls acts like a prism, which allows the rainbow spectrum of colors to be visible to the naked eye. Opal has been a stone of myth and mysticism for thousands of years.