Monazite-(La) is a relatively rare representative of the monazite group, with lanthanum being the dominant rare earth element in its structure. As such, it is the lanthanum analogue of monazite-(Ce), monazite-(Nd), and monazite-(Sm). It is also the phosphorus analogue of gasparite-(La).[4] 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.[5]
| Monazite-(La) | |
|---|---|
| General | |
| Category | Phosphate mineral |
| Formula (repeating unit) | LaPO4 |
| IMA symbol | Mnz-La[1] |
| Crystal system | Monoclinic |
| Crystal class | Prismatic: 2/m |
| Space group | P21/n |
| Unit cell | a = 6.84, b = 7.07, c = 6.45 [Å]; β = β = 103.85◦ |
| Identification | |
| References | [2][3] |
References
edit- ^ 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.
- ^ Mindat, Monazite-(La), https://www.mindat.org/min-2752.html
- ^ Handbook of Mineralogy, Monazite-(La), http://www.handbookofmineralogy.org/pdfs/monazite-(La).pdf
- ^ Mindat, Monazite-(La), https://www.mindat.org/min-2752.html
- ^ Mindat, Monazite Group, https://www.mindat.org/min-29313.html