Monazite-(Ce)

Monazite-(Ce), Quartz.

Locality: Siglo Veinte Mine (Siglo XX Mine; Llallagua Mine; Catavi), Llallagua, Rafael Bustillo Province, Potosí Department, Bolivia (Locality at mindat.org).

Size: 3.5 × 2.6 × 1.3 cm.

General
Category| Phosphate mineral
Formula
(repeating unit)| CePO4
Crystal system| Monoclinic
Crystal class| Prismatic: 2/m
Space group| P21/b
Unit cell| a = 6.7902, b = 7.0203, c = 6.4674 [Å]; β = 103.6°
Identification
References| [1]

Monazite-(Ce) 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).[3] The group contains simple rare earth phosphate minerals with the general formula of AXO4, 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.[4]

## References

1. ↑ Mindat, Monazite-(Ce), https://www.mindat.org/min-2751.html
2. ↑ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine 85 (3): 291–320. doi:10.1180/mgm.2021.43. Bibcode: 2021MinM...85..291W.
3. ↑ Mindat, Monazite-(Ce), https://www.mindat.org/min-2751.html
4. ↑ Mindat, Monazite Group, https://www.mindat.org/min-29313.html

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