AVANTURINE GLASS Russian patent published in 2003 - IPC

FIELD: glassmaking. SUBSTANCE: invention relates to manufacture of avanturine glass and can be utilized when manufacturing ornamental facing materials and jewelry. Quality of glass is enhanced by adding B₂O₃, Cu₂O, TiO₂, K₂O,, and rare-earth metal oxides so that glass is composed of, wt %: SiO₂ 28.969049.835, TiO₂ 16.33-20.0, Al₂O₃ 2.0-7.90, Fe₂O₃ 2.85-5.14, FeO 0.01- 0.93, CaO 15.70-17.10, MgO 1.10-2.50, MnO 0.15-3.30, Na₂O 4.00-6.00, K₂O 1.00-3.00, P₂O₅ 0.43-0.86, Cr₂O₃ 0.91-5.00, Cu₂O 0.01-2.00, B₂O₃ 0.10-2.00, La₂O₃ 0.005-0.01, CeO₂ 0.001-0.005, and Sm₂O₃ 0.002-0.01. EFFECT: increased microhardness and mechanical strength, extended color spectrum, and enhanced avanturine effect. 2 tbl