(KNa)Fe2+(CaNa2)Fe2+13Al(PO4)11(PO3OH)(OH)2
Arrojadite is the only colourless phosphate species in these deposits.
Selected Australian Occurrences:
- Blue Jacket Tin Mine (Blue Jacket Reef), Mount Wills, Victoria.
- Knocker dyke (South Blue Jacket), Mount Wills, Victoria.