What Is Opal Made Of - Web opal is formed from a solution of silica and water in the earth, usually in cracks and voids caused by natural faults or decomposing fossils. The process can be influenced by acidic conditions, volcanic activity, or ironstone concretions. The three major varieties of australian opal are black, white, and boulder opal. The novel “ anne of geierstein ” gave opal a reputation of being unlucky. Sio 2 •nh 2 o.
The three major varieties of australian opal are black, white, and boulder opal. Web opal is formed from a solution of silica and water in the earth, usually in cracks and voids caused by natural faults or decomposing fossils. The process can be influenced by acidic conditions, volcanic activity, or ironstone concretions. The novel “ anne of geierstein ” gave opal a reputation of being unlucky. Sio 2 •nh 2 o.