Opal
silica mineral / From Wikipedia, the free encyclopedia
The opal is a fairly white rock mineral. It is the birthstone for the month of October. Opals are made from tiny spheres of silica (another mineral) and lots of water.
The opal is a fairly white rock mineral. It is the birthstone for the month of October. Opals are made from tiny spheres of silica (another mineral) and lots of water.