The mineral with intermediate composition is known as sicklerite ( Li ( Mn, Fe ) PO 4 ).
2.
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.
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