Monazite-(Ce) (CePO
4) is the most common representative of the monazite group. It is the cerium-dominant analogue of
monazite-(La),
monazite-(Nd), and
monazite-(Sm). It is also the phosphorus analogue of gasparite-(Ce).
The group contains simple rare earth phosphate minerals with the general formula of AXO
4, where A = Ce, La, Nd, or Sm (or, rarely, Bi), and X = P or, rarely, As. The A site may also bear Ca and Th.
[Mindat, Monazite Group, https://www.mindat.org/min-29313.html]
References
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Cerium minerals
Phosphate minerals
Monoclinic minerals
Minerals in space group 14