SHANGHAI, Feb 24 (SMM) - Silicon metal prices held stable this week. As of February 23, the prices of standard #553 silicon stood at 17,000-17,200 yuan/mt in east China, flat from a week earlier. Above-standard #553 silicon prices remained flat at 17,400-17,600/mt. Prices for #421 silicon stood at 19,100-19,300 yuan/mt, flat from a week earlier. Prices for #3303 silicon were 18,700-18,900 yuan/mt, flat from a week earlier.