Grew, E.S., Graetsch, H., Pöter, B., Yates, M.G., Buick, I., Bernhardt, H.-J., Schreyer, W, Werding, G, Carson, C.J. and Geoffrey L. Clarke, G.L. (2008) Boralsilite, Al16B6Si2O37, and “boron-mullite”: compositional variations and associated phases in experiment and nature. American Mineralogist, 93, 283-299.