Here are two references: McCOY T.J. et al. (1993) Chladniite: A new mineral honoring the father of METEORITICS (Meteoritics 28-3, 1993, A394). McCOY T.J. et al. (1994) Chladniite, Na2CaMg7(Po4)6: A new mineral from the Carlton IIICD iron meteorite (Am. Mineral. 79, 375-380). Regards, Bernd