Nacaphite (original) (raw)

A valid IMA mineral species

About NacaphiteHide

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Crystal System:

Monoclinic

Name:

Named for its composition, including sodium (NAtrium), CAlcium, and PHosphorus.

It may be in a homologous series with seidozerite, as suggested by some authors.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:2824:6

42e0180d-b70c-42e1-b689-8d15160e9c57

IMA Classification of NacaphiteHide

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Type description reference:

Classification of NacaphiteHide

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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

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of NacaphiteHide

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Optical Data of NacaphiteHide

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RI values:

_n_α = 1.508 _n_β = 1.515 _n_γ = 1.520

2V:

Measured: 80° , Calculated: 80°

δ = 0.012

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Chemistry of NacaphiteHide

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Mindat Formula:

Na2Ca(PO4)F

Crystallography of NacaphiteHide

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Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 13.3185(14) Å, b = 7.0964(8) Å, c = 10.6490(11) Å
β = 113.526(1)°

Ratio:

a:b:c = 1.877 : 1 : 1.501

Comment:

pseudo-orthorhombic C-centred (a = 10.65, b = 24.43, c = 7.10)

Crystal StructureHide

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X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of NacaphiteHide

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Place of Conservation of Type Material:

Geology Museum, Kola Branch, Academy of Sciences, Apatity, Russia, 5534.
Mining Institute, St. Petersburg, Russia, 1116/2.
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 79854.
The Natural History Museum, London, England, 1994,15.

Geological Setting of Type Material:

Ijolite-urtite pegmatite in an apatite deposit.

Reference:

Khomyakov, A.P., Kazakova, M.E., Pushcharovskii, D.Y. (1980) Nacaphite, Na2CaPO4F, a new mineral. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva: 109(1): 50-52.

Synonyms of NacaphiteHide

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Other Language Names for NacaphiteHide

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Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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Health Risks:

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

Internet Links for NacaphiteHide

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References for NacaphiteHide

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Reference List:

Sokolova, E. V., Kabalov, Y. K., Ferraris, G., Schneider, J., Khomyakov, A. P. (1999) Modular approach in solving the crystal structure of a synthetic dimorph of nacaphite, Na2Ca[PO4]F, from powder-differaction data. The Canadian Mineralogist, 37 (1) 83-90

Krivovichev, S. V., Yakovenchuk, V. N., Ivanyuk, G. Yu., Pakhomovsky, Y. A., Armbruster, T., Selivanova, E. A. (2007) The crystal structure of nacaphite, Na2Ca(PO4)F: A re-investigation. The Canadian Mineralogist, 45 (4) 915-920 doi:10.2113/gscanmin.45.4.915

Localities for NacaphiteHide

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This 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.

Locality ListHide

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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.