Beryllium Aluminate, Be(AlO₂)₂

Ebelmen prepared artificial cymopliane (chrysoberyl), Be(AlO₂)₂, by fusing the constituent oxides with boric anhydride and calcium carbonate.

Crystals indistinguishable from cymophane result from the solution of alumina and beryllia in fused alkaline sulphides. Hautefeuille and Perrey used a mixture of alumina, beryllia, potassium sulphate, and carbon.