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Fluorcarmoite-(BaNa)

Summary

Fluorcarmoite-(BaNa) is a rare phosphate mineral, belonging to arrojadite group, with the formula Ba[]Na2Na2[]CaMg13Al(PO4)11(PO3OH)F2.[2] It is a barium-rich member of the group, as is arrojadite-(BaNa), arrojadite-(BaFe), fluorarrojadite-(BaFe)[3] and an unapproved species ferri-arrojadite-(BaNa).[4] The "-(BaNa)" suffix informs about the dominance of the particular elements (here barium and sodium) at the corresponding structural sites.[5]

Fluorcarmoite-(BaNa)
General
CategoryPhosphate
Formula
(repeating unit)		Ba[]Na2Na2[]CaMg13Al(PO4)11(PO3OH)F2
IMA symbolFcm-BaNa[1]
Crystal systemMonoclinic
Crystal classDomatic (m)
(same H-M symbol)
Space groupCc
Unit cella = 16.40, b = 9.95
c = 24.45 [Å]; β = 105.73° (approximated)
Identification
References[2][3]

Arrojadite group edit

The arrojadite group is defined in form of the complex, general formula A2B2CaNa2+xM13Al(PO4)11(PO3OH1−x)W2, where:

  • A = large divalent cations (barium, lead, strontium) and vacancy ([]), eventually monovalent cations (potassium, sodium)
  • B = small divalent cations (iron, manganese, magnesium) and vacancy ([]), eventually sodium
  • M = Fe2+ (this gives the root name arrojadite) or Mn2+ (root name dickinsonite), or eventually Mg
  • W = hydroxyl group or fluorine

The two suffixes in the name correspond to A1 and B1 sites. Third suffix may be present in special cases.[6]

References edit

  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. ^ a b Cámara, F., Bittarello, E., Ciriotti, M.E., Nestola, F., Radica, F., and Bracco, R., 2015. Fluorcarmoite-(BaNa), IMA 2015-062. CNMNCNewsletter No. 27, October 2015, 1229; Mineralogical Magazine 79, 1229–1236
  3. ^ a b "Fluorcarmoite-(BaNa): Fluorcarmoite-(BaNa) mineral information and data". Mindat.org. Retrieved 2016-03-12.
  4. ^ "Ferri-arrojadite-(BaNa): Ferri-arrojadite-(BaNa) mineral information and data". Mindat.org. Retrieved 2016-03-12.
  5. ^ Hatert, F., Mills, S.J., Pasero, M., and Williams, P.A., 2013. CNMNC guidelines for the use of suffixes and prefixes in mineral nomenclature, and for the preservation of historical names. European Journal of Mineralogy 25, 113-115
  6. ^ Chopin, C., Oberti, R., and Cámara, F. 2006. The arrojadite enigma: II. Compositional space, new members and nomenclature of the group. American Mineralogist 91, 1260-1270.