Beryllium salt is treated with hydrazine carbonate solution for formation of basic beryllium carbonate, heated to precipitate as Be(OH)2, filtered, washed with warm water, dried, ignited and weighed as BeO; there was almost no error of estimation, Using of ethylamine solution gives Be(OH)2 at pH. 5.56.0, while using of ethylamine carbonate gives basic beryllium carbonate at pH 6.3, which turns to Be(OH)2 on heating. Accordingly, it can be estimated as BeO by usual method. Methylamine or its carbonate solution gives a similar result and the estimation can be carried out simply. For precipitation of Be as BeNH4PO4·xH2O, the solution at pH. 7.27.6. BeO is found from its pyrophosphate by using the factor 0.2565. Crystalline berylliumammonium phosphate is found to be Be NH4PO4·41/2 H2O. The presence of tartaric acid or potassium salt in the solution has large influence on the estimation of beryllium.