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The mineral  unknown A  reported by Bridge from the Petrogale Cave in Western Australia has been shown to be phoxite, a recently described mineral from the Rowley mine in Arizona, USA. This is only the second recorded occurrence of phoxite, and while at the type locality, it occurs with struvite, (NH 4 )Mg(PO 4 )·6H 2 O, at the Petrogale Cave, it occurs with weddellite, Ca(C 2 O 4 )·2H 2 O. Phoxite can be synthesised from struvite or newberyite, MgHPO 4 ·3H 2 O, by reaction with ammonium oxalate in water or by grinding the solids together. Mixing newberyite or struvite with ammonium oxalate in high humidity enables a clean synthesis of phoxite. A competing reaction is the formation of magnesium oxalate dihydrate (the mineral glushinskite). However, while stable in the solid, washing with water allows phoxite to revert to struvite, as part of a solid liquid equilibrium.

Formation of phoxite, (NH 4 ) 2 Mg 2 (C 2 O 4 ) (PO 3 OH) 2 •4H 2 O, from struvite and its occurrence in Petrogale Cave, Western Australia