1200 u00b0 2 hrs fine grained white surface glazed20 900 u00b0 2 hrs glassy white translucent20 1000 u00b0 2 hrs very fine grained white20 1100 u00b0 2 hrs very fine grained white21 none clear slightly hazy glass21 1000 u00b0 2 hrs glassy translucent white22 none clear glass slightly cordy22 1000 u00b0 2 hrs glassy translucent white sagged23 none clear glass slightly cordy23 1000 u00b0 2 hrs glassy translucent white sagged______________________________________ coef example crystal phases exp density______________________________________1 bpo sub 4 5 2 2 bpo sub 4 5 3 3 bpo sub 4 3 58 7 2 5693 bpo sub 4 4 3 bpo sub 4 5 4 bpo sub 4 3 4 bpo sub 4 4 4 bpo sub 4 5 5 bpo sub 4 3 5 bpo sub 4 4 5 bpo sub 4 5 6 53 0 2 3916 bpo sub 4 3 51 7 2 4896 bpo sub 4 4 51 5 2 4956 bpo sub 4 5 7 bpo sub 4 2 7 bpo sub 4 3 8 bpo sub 4 2 8 bpo sub 4 3 9 49 1 2 3549 bpo sub 4 2 9 bpo sub 4 3 45 8 2 4299 10 bpo sub 4 2 10 bpo sub 4 3 11 11 bpo sub 4.