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Monazite-(Sm) is an exceedingly rare representative of the monazite group, with samarium being the dominant rare earth element in its structure. It is the samarium analogue of monazite-(Ce), monazite-(La), and monazite-(Nd). It is only the second known mineral with samarium being the mineral-forming element, after florencite-(Sm). The group contains simple rare earth phosphate minerals with the general formula of ATO₄, where A = Ce, La, Nd, or Sm (or, rarely, Bi), and B = P or, rarely, As. The A site may also bear Ca and Th.

References

1. Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
2. Mindat, Monazite-(Sm), https://www.mindat.org/min-11438.html
3. Mindat, Monazite-(Sm), https://www.mindat.org/min-11438.html
4. Mindat, Monazite Group, https://www.mindat.org/min-29313.html

• Samarium minerals
• Phosphate minerals
• Monoclinic minerals
• Minerals in space group 11
• Minerals described in 2002