In the above article, published in the `GSW online version' of the June 2009 issue of Mineralogical Magazine, a comma in a mineral formula was inadvertantly omitted in two instances.

To match the formula which was correctly specified in the paper title, the formula in line 1 of the Abstract should read (Ca,Na)2(Al,Mg,Fe2+)(Si2O7). Similarly, on p. 382, the formula should read (Ca,Na)2(Al,Mg,Fe2+)(Si2O7) and not as originally presented, (CaNa)2(Al,Mg,Fe2+)(Si2O7).

The formulae are correctly presented in...

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