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Brick #2: 76.52%SiO 2, 13.67%Al 2 O 3, 6.77%Fe 2 O 3, 1.77%CaO, 0.42%MgO, 0.27%MnO, no specified density. Judging from the descriptions the TPRC has put the wrong labels on their bricks, and if that is the case then Brick #1 is "Common Brick" and Brick #2 is "Red Brick."