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Nacaphite

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Formula:
Na2Ca(PO4)F
System:
Monoclinic
Colour:
Colourless
Lustre:
Vitreous
Hardness:
3
This page provides mineralogical data about Nacaphite.

Classification of Nacaphite

Approved 1979
8.BO.05

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
O : With only large cations, (OH, etc.):RO4 about 1:1
41.3.6.1

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
3 : (AB)3(XO4)Zq
22.1.5

22 : Phosphates, Arsenates or Vanadates with other Anions
1 : Phosphates, arsenates or vanadates with fluoride
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First Recorded Occurrence of Nacaphite

Year of Discovery:
1979

Physical Properties of Nacaphite

Vitreous
Colour:
Colourless
Streak:
White
Hardness (Mohs):
3

Crystallography of Nacaphite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Space Group Setting:
P1 21/c 1
Cell Parameters:
a = 13.3185(14) Å, b = 7.0964(8) Å, c = 10.6490(11) Å
α = 90°, β = 113.526(1)°, γ = 90°
Ratio:
a:b:c = 1.877 : 1 : 1.501
Unit Cell Volume:
V 922.81 ų
Z:
8
Comment:
pseudo-orthorhombic C-centred (a = 10.65, b = 24.43, c = 7.10)

Optical Data of Nacaphite

Type:
Biaxial (-)
RI values:
nα = 1.508 nβ = 1.515 nγ = 1.520
2V:
Measured: 80° , Calculated: 80°
Max Birefringence:
δ = 0.012
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
none

Chemical Properties of Nacaphite

Formula:
Na2Ca(PO4)F
Essential elements:
All elements listed in formula:

Relationship of Nacaphite to other Species

8.BO.10PreisingeriteBi3(AsO4)2O(OH)
8.BO.10PetitjeaniteBi3(PO4)2O(OH)
8.BO.10SchumacheriteBi3(VO4)2O(OH)
8.BO.15AtelestiteBi2(AsO4)O(OH)
8.BO.15HechtsbergiteBi2(VO4)O(OH)
8.BO.15SmrkoveciteBi2(PO4)O(OH)
8.BO.20KombatitePb14(VO4)2O9Cl4
8.BO.20SahlinitePb14(AsO4)2O9Cl4
8.BO.25HeneuiteCaMg5(CO3)(PO4)3(OH)
8.BO.30NefedoviteNa5Ca4(PO4)4F
8.BO.35Kuznetsovite(Hg2+)Hg2+(AsO4)Cl
8.BO.40Artsmithite(Hg2+)2Al(PO4)1.74(OH)1.78
8.BO.45SchlegeliteBi7(AsO4)3(MoO4)2O4
22.1.1AmblygoniteLiAl(PO4)F
22.1.2LacroixiteNaAl(PO4)F
22.1.3NatrophosphateNa7(PO4)2F · 19H2O
22.1.6ArctiteNa2Ca4(PO4)3F
22.1.7NefedoviteNa5Ca4(PO4)4F
22.1.9FluorapatiteCa2Ca3(PO4)3F
22.1.10HerderiteCaBePO4(F,OH)
22.1.11IsokiteCaMg(PO4)F
22.1.12PanasqueiraiteCaMg(PO4)(OH,F)
22.1.13BabefphiteBaBePO4(F,OH)
22.1.14FluelliteAl2(PO4)F2(OH) · 7H2O
22.1.15MinyuliteKAl2(PO4)2(OH,F) · 4H2O
22.1.16MoriniteNaCa2Al2(PO4)2(OH)F4 · 2H2O
22.1.17BøggilditeNa2Sr2Al2PO4F9
22.1.18FluorstrophiteSrCaSr3(PO4)3F
22.1.19ViitaniemiiteNa(Ca,Mn2+)Al(PO4)(F,OH)3
22.1.20VäyryneniteMn2+Be(PO4)(OH,F)
22.1.21MaxwelliteNaFe3+(AsO4)F
22.1.22Wagnerite(Mg,Fe2+)2(PO4)F
22.1.23Triplite(Mn2+,Fe2+)2(PO4)(F,OH)
22.1.24Magniotriplite(Mg,Fe2+,Mn2+)2PO4F
22.1.25Zwieselite(Fe2+,Mn2+)2(PO4)F
22.1.26McauslaniteFe3Al2(PO4)3(PO3OH)F · 18H2O
22.1.27RichelliteCaFe23+(PO4)2(OH,F)2
22.1.28SvabiteCa5(AsO4)3F
22.1.29TilasiteCaMg(AsO4)F
22.1.30Johnbaumite-MCa5(AsO4)3OH
22.1.31DurangiteNaAl(AsO4)F

Other Names for Nacaphite

Name in Other Languages:
German:Nacaphit
Spanish:Nacaphita

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Nacaphite

Reference List:
American Mineralogist (1981): 66: 218.

American Mineralogist (1991): 76: 305.

Doklady Rossiiskoi Akademii Nauk: 304: 610-615.

Sokolova, E., Egorov-Tismenko, Yu.K., and Khomyakov, A.P. (1989) Crystal structure of nacaphite. Soviet Physics – Doklady: 34: 9-11.

Egorov-Tismenko, Yu.K. and Sokolova, E.V. (1990) Homologous series seidozerite-nacaphite. Mineralogicheskii Zhurnal, Kiev: 12(1): 40-49 (in Russian).

Sokolova, E.V. (1998) Polysomatic series seidozerite-nacaphite. Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 127(2): 111-114 (in Russian).

Krivovichev, S.V., Yakovenchuk, V.N., Ivanyuk, G.Yu., Pakhomovsky, Ya.A., Armbruster, T., Selivanova, E.A. (2007): The crystal structure of nacaphite, Na2Ca(PO4)F: a re-investigation. Canadian Mineralogist, 45, 915-920.

Internet Links for Nacaphite

Localities for Nacaphite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Russia
 
  • Northern Region
    • Murmanskaja Oblast'
      • Kola Peninsula
        • Khibiny Massif
          • Koashva Mt
Arzamastsev, A., Yakovenchuk, V., Pakhomovsky, Y., & Ivanyuk, G. (2008). The Khibina and Lovozero alkaline massifs: Geology and unique mineralization. In Guidbook for 33rd International Geological Congress Excursion (No. 47, p. 58).
33 IGC excursion No 47, July 22 – August 2, 2008 Stop 2-2
          • Kukisvumchorr Mt
No reference listed
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
P.M. Kartashov data
www.koeln.netsurf.de/~w.steffens/lovo.htm
Mineral and/or Locality  
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