Opals are created by a mixture of silicon dioxide and water. Silica is carried down into rock crevices by heavy rains, and when the water evaporates, the silica gel hardens and is deposited in the form of tiny spheres. My Dad taught me that, along with everything else gemstone, rock and mineral related. I guess that’s the benefit of have a geologist as a father.
October’s Birthstone: Opal / Tourmaline
