Published analyses of bavenite, beryllium calcium aluminosilicate, indicate a wide range of BeO content, but it is probable that all of the early analyses of bavenite gave incorrect figures for the BeO content. A new chemical analysis of bavenite from California shows 7.66 per cent BeO, in good agreement with the analysis of duplexite by Rowledge and Hayton; duplexite is bavenite.

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