Bello Opal® Galaxy Collection (Mineral Type Created Opal) is composed by silica & very small portion of water. This opal is made to be compatible with COE 33 (borosilicate glass). It is the mainstream opal for lampworking glass art. It is as known as “Galaxy Opal”, “Created Opal” and “Gilson Opal”. It is available in 14 opal colours, such as water opal, milky opal, black opal, blue opal, pink opal and fire opal.