In recent papers by Fleischer and Switzer (1953) and Switzer and Reichen (1960) chemical analyses of bavenite and “pilinite” are considered. In the second paper the formula (Be,Al)4Ca4(SiO3)9 · xH2O is suggested as representing the cell content of bavenite with Z = 1 for the unit cell measured by Ksanda and Merwin (1933) and Z = 4 for the larger unit cell found by Claringbull (1940). This formula provides for mutual substitution of Be for A1 which is indeed indicated by the analysis. Variation of the Be:Al ratio from 2:2 in this formula results in a charge imbalance.

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