M (Al2[Be3(Si6O18)]) = 27*2 + 9*3 + 28*6 + 16*18 = 54 + 27 + 168 + 288 = 537
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M (Al2[Be3(Si6O18)]) = 27*2 + 9*3 + 28*6 + 16*18 = 54 + 27 + 168 + 288 = 537