Messelite occurs in association with amblygonite, anapaite, brazilianite, eosphorite, fair�eldite, goyazite, graftonite, herderite, hureaulite, ludlamite, phosphoferrite, siderite, triphylite, vivianite, and whitlockite.
12.
The type locality for Robertsite is the Tip Top mine, Custer County, South Dakota, US . Robertsite occurs at the Tip Top Mine as minute crystal aggregates and crusts found on quartz associated with triphylite.
13.
A complete series exists from lithiophilite, LiMn 2 + PO 4 to triphylite, LiFe 2 + PO 4, including hureaulite, strengite, FePO 4 ?H 2 O, stewartite, Mn 2 + Fe 3 + 2 ( OH, PO 4 ) 2 ?H 2 O, and sicklerite, ( LiMn 2 +, Fe 3 + ) PO 4.
