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Nacaphite

Big Photo

Koashva Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
© 2008, J. Weissman

Formula:
Na
 
2
Ca[F|PO
 
4
]
System:TriclinicColour:Colourless
Lustre:VitreousHardness:3
This page provides mineralogical data about Nacaphite.

Classification of Nacaphite

IMA status:Approved 1979
Strunz 8th edition ID:7/B.25-60
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:41.3.6.1

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
3 : (AB)3(XO4)Zq
Hey's CIM Ref.:22.1.5

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

Type Locality:Rasvumchorr Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
Year of Discovery:1980

Physical Properties of Nacaphite

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

Crystallography of Nacaphite

Crystal System:Triclinic
Class (H-M):1 - Pedial
Space Group:P1
Cell Parameters:a = 10.64Å, b = 24.42Å, c = 7.08Å
Ratio:a:b:c = 0.436 : 1 : 0.29
Unit Cell Volume:V 0.00 ų (Calculated from Unit Cell)

Optical Data of Nacaphite

Type:Biaxial (-)
RI values: nα = 1.508 nβ = 1.515 nγ = 1.520
2V:Measured: 80° , Calculated: 80°
Maximum Birefringence:δ = 0.012

Chart 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:
Na
 
2
Ca[F|PO
 
4
]
Essential elements:Ca, F, Na, O, P
All elements listed in formula:Ca, F, Na, O, P

Relationship of Nacaphite to other Species

Related Minerals - Nickel-Strunz Grouping):
8.BO.10Preisingerite
Bi
 
3
[O|OH|(AsO
 
4
)
 
2
]
8.BO.10Petitjeanite
Bi
 
3
[O|OH|(PO
 
4
)
 
2
]
8.BO.10Schumacherite
Bi
 
3
[O|OH|(VO
 
4
)
 
2
]
8.BO.15Atelestite
Bi
 
8
[O
 
5
|(OH)
 
5
|(AsO
 
4
)
 
3
]
8.BO.15Hechtsbergite
Bi
 
2
[O|OH|VO
 
4
]
8.BO.15Smrkovecite
Bi
 
2
[O|OH|PO
 
4
]
8.BO.20Kombatite
Pb
 
14
[O
 
9
|(VO
 
4
)
 
2
|Cl
 
4
]
8.BO.20Sahlinite
Pb
 
14
[O
 
9
|(AsO
 
4
)
 
2
|Cl
 
4
]
8.BO.25Heneuite
CaMg
 
5
(CO
 
3
)(PO
 
4
)
 
3
OH
8.BO.30Nefedovite
Na
 
5
Ca
 
4
(PO
 
4
)
 
4
F
8.BO.35Kuznetsovite
(Hg-Hg)Hg
2+
 
[Cl|AsO
 
4
]
8.BO.40Artsmithite
(Hg-Hg)
2+
2
Al[(OH)
 
1+3x
|(PO
 
4
)
 
2-x
] (x ≈ 0.26)
8.BO.45Schlegelite
Bi
 
7
[O
 
4
|(MoO
 
4
)
 
2
|(AsO
 
4
)
 
3
]
Related Minerals - Hey's Index Grouping:
22.1.1Amblygonite
(Li,Na)Al[(F,OH)|PO
 
4
]
22.1.2Lacroixite
NaAl[F|PO
 
4
]
22.1.3Natrophosphate
Na
 
7
(PO
 
4
)
 
2
F·19H
 
2
O
22.1.6Arctite
Na
 
2
Ca
 
4
(PO
 
4
)
 
3
F
22.1.7Nefedovite
Na
 
5
Ca
 
4
(PO
 
4
)
 
4
F
22.1.9Apatite-(CaF)
Ca
 
5
[F|(PO
 
4
)
 
3
]
22.1.10Herderite
CaBe[(F,OH)|PO
 
4
]
22.1.11Isokite
CaMg[F|PO
 
4
]
22.1.12Panasqueiraite
CaMg[(OH,F)|PO
 
4
]
22.1.13Babefphite
BaBe[(F,OH)|PO
 
4
]
22.1.14Fluellite
Al
 
2
[F
 
2
|OH|PO
 
4
] · 7H
 
2
O
22.1.15Minyulite
KAl
 
2
[(OH,F)|(PO
 
4
)
 
2
] · 4H
 
2
O
22.1.16Morinite
Na
 
2
Ca
 
4
Al
 
4
[(F,OH)
 
5
|(PO
 
4
)
 
2
]
 
2
 · 3H
 
2
O
22.1.17Bøggildite
Na
 
2
Sr
 
2
Al
 
2
PO
 
4
F
 
9
22.1.18Apatite-(SrOH)
(Sr,Ca)
 
5
(PO
 
4
)
 
3
(OH,F)
22.1.19Viitaniemiite
Na(Ca,Mn
2+
 
)Al[(F,OH)
 
3
|PO
 
4
]
22.1.20Väyrynenite
Mn
2+
 
Be[(OH,F)|PO
 
4
]
22.1.21Maxwellite
NaFe
3+
 
[F|AsO
 
4
]
22.1.22Wagnerite
(Mg,Fe
2+
 
)
 
2
[F|PO
 
4
]
22.1.23Triplite
(Mn
2+
 
,Fe
2+
 
)
 
2
[(F,OH)|PO
 
4
]
22.1.24Magniotriplite
(Mg,Fe
2+
 
,Mn
2+
 
)
 
2
[F|PO
 
4
]
22.1.25Zwieselite
(Fe
2+
 
,Mn
2+
 
)
 
2
[F|PO
 
4
]
22.1.26Mcauslanite
HFe
2+
3
Al
 
2
[F|(PO
 
4
)
 
4
] · 18H
 
2
O
22.1.27Richellite
Ca
 
3
Fe
3+
10
[(OH,F)
 
3
|(PO
 
4
)
 
2
]
 
4
 · nH
 
2
O (not confirmed)
22.1.28Svabite
Ca
 
5
[(F,Cl,OH)|(AsO
 
4
)
 
3
]
22.1.29Tilasite
CaMg[F|AsO
 
4
]
22.1.30Fermorite
(Ca,Sr)
 
5
(AsO
 
4
,PO
 
4
)
 
3
(OH)
22.1.31Durangite
NaAl[F|AsO
 
4
]

Other Names for Nacaphite

Synonyms:
IMA1979-026
German names:
Nacaphit
Russian names:
Накафит
Spanish names:
Nacaphita

Other Information

Health Warning: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

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    Localities for Nacaphite

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    The 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.
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    (TL) indicates type locality. ? 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
    		No reference listed
            • Kukisvumchorr Mt
    		No reference listed
    No reference listed
    P.M. Kartashov data
    www.koeln.netsurf.de/~w.steffens/lovo.htm
    Mineral and/or Locality
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