Nacaphite Mineral Data

Nacaphite Mineral Data +

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General Nacaphite Information

Chemical Formula:

Na(Na,Ca)2(PO4)F

Composition:

Molecular Weight = 194.90 gm

Sodium 27.13 % Na 36.57 % Na₂O

Calcium 14.39 % Ca 20.14 % CaO

Phosphorus 15.89 % P 36.41 % P₂O₅

Oxygen 32.84 % O

Fluorine 9.75 % F 9.75 % F

- % F -4.10 % -O=F₂

______ ______

100.00 % 98.77 % = TOTAL OXIDE

Empirical Formula:

Na_2.3Ca_0.7(PO₄)F

IMA Status:

Approved IMA 1980

Locality:

Link to MinDat.org Location Data.

Name Origin:

Named after the composition (NaCa, Phosphate).

Synonym:

ICSD 51234

PDF 33-1222

Nacaphite Image

Images:

Nacaphite Thermonatrite

Comments: Sparse pale yellow-brown microcrystal and crystalline nacaphite with white thermonatrite on a dark matrix.
Location: Khibiny Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Nacaphite Crystallography

Axial Ratios:

a:b:c =0.4359:1:0.5811

Cell Dimensions:

a = 5.3232, b = 12.2103, c = 7.0961, Z = 4; alpha = 90.002°, beta = 89.998°, gamma = 89.965° V = 461.23 Den(Calc)= 2.81

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.649(1), 3.054(0.45), 3.049(0.4),

Crystal Structure:

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

View Additional jPOWD Structure files for Nacaphite
[1]

Physical Properties of Nacaphite

Cleavage:

None

Color:

Colorless, White.

Density:

2.85

Diaphaniety:

Transparent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Hardness:

3 - Calcite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Nacaphite

Gladstone-Dale:

CI meas= 0.014 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.183,KPDmeas= 0.1805,KC= 0.183

Optical Data:

Biaxial (-), a=1.508, b=1.515, g=1.52, bire=0.0120, 2V(Calc)=80, 2V(Meas)=80.

Calculated Properties of Nacaphite

Electron Density:

r_electron=2.75 gm/cc
note: r_Nacaphite=2.81 gm/cc.

Fermion Index

Fermion Index = 0.00035
Boson Index = 0.99965

Photoelectric:

PE_Nacaphite= 3.03 barns/electron
U=PE_Nacaphite x r_electron= 8.34 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Nacaphite is Not Radioactive

Nacaphite Classification

Dana Class:

41.3.6.1 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.3)where (A B)3 (XO4) Zq

(41.3.6)Dana Group

41.3.6.1 Nacaphite Na(Na,Ca)2(PO4)F P1 1

Strunz Class:

VII/B.25-60 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O, OH. cations of medium and big size: Mg, Cu, Zn, and Ca, Na, K, Ba, Pb

VII/B.25 - Isokite - Thadeuite series

VII/B.25-10 Isokite CaMg(PO4)F C 2/c 2/m

VII/B.25-20 Panasqueiraite CaMg(PO4)(OH,F) C 2/c 2/m

VII/B.25-30 Tilasite CaMg(AsO4)F C 2/c 2/m

VII/B.25-40 Lacroixite NaAl(PO4)F C 2/c 2/m

VII/B.25-50 Durangite NaAl(AsO4)F C 2/c 2/m

VII/B.25-55 Maxwellite NaFe(AsO4)F Aa,A2/a Mono

VII/B.25-60 Nacaphite Na(Na,Ca)2(PO4)F P1 1

VII/B.25-70 Spodiosite? Ca2(PO4)F Pbcm 2/m 2/m 2/m

VII/B.25-80 Thadeuite (Ca,Mn)(Mg,Fe,Mn)3(PO4)2(OH,F)2 C 222₁ 2 2 2

Other Nacaphite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Min, 2nd ed.,1990, AmMin, Vol 87, p 768) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Nacaphite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 -École des Mines de Paris

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Nacaphite

Na(Na,Ca)2(PO4)F
Dana No: 41.3.6.1 Strunz No: VII/B.25-60
Locality:

Notes: