... , crystal parallel, lattice, rhombus, double star, frost bistar, sea wave, water bubble, diamond, oblique line, cycle rhombus, well ... meshy, coral, nautilus, alpha 3. The following information is based on a typical 190x190x80mm clear glass block. Composition: ... Silica-sand, soda ash, calcium. Fusion is obtained at approximately 1550OC. Light Transmission Clear 190x190x80 = 80 ...