The Galaxy Opal is the world's largest polished opal, certified by the Guinness Book of World Records in 1992. It was found at the Boi Morto Mine in north eastern Brazil in 1976. It is today part of a private collection. The finished opal weighs approximately 3,749 carats, or 0.75 kg.

What is a galaxy Opal used for?

Galaxy Opal is chemically identical to natural opal, both are 100% silica, both have the same hardness, brilliance and fire. The only thing that changes is origin. Galaxy Opal is especially suitable for glassblowing art as it can resist more than 900 degree C.

What is a galaxy Opal made of?

Opal is formed from a solution of silicon dioxide and water. As water runs down through the earth, it picks up silica from sandstone, and carries this silica-rich solution into cracks and voids , caused by natural faults or decomposing fossils. As the water evaporates, it leaves behind a silica deposit.