Nacaphite Mineral Data

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

Environment:

Hydrothermal assemblages.

IMA Status:

Approved IMA 1980

Locality:

Khibiny alkaline massif, Russia. Link to MinDat.org Location Data.

Name Origin:

Named after the composition (NaCa, Phosphate).

Name Pronunciation:

Nacaphite + Pronunciation

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 =0.436:1:0.2905

Cell Dimensions:

a = 10.65, b = 24.425, c = 7.097, Z = 16; alpha = 89.99°, beta = 89.998°, gamma = 90.04° V = 1,846.12 Den(Calc)= 2.80

Crystal System:

Triclinic - Pinacoidal H-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),

Physical Properties of Nacaphite

Cleavage:

None

Color:

Colorless, White.

Density:

2.85

Diaphaneity:

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= -0.015 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.033 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.189,KPDmeas= 0.1857,KC= 0.183
Ncalc = 1.51 - 1.52

Optical Data:

Biaxial (-), a=1.524, b=1.528, g=1.536, bire=0.0120, 2V(Calc)=72, 2V(Meas)=65.

Calculated Properties of Nacaphite

Electron Density:

Bulk Density (Electron Density)=2.79 gm/cc
note: Specific Gravity of Nacaphite =2.85 gm/cc.

Fermion Index:

Fermion Index = 0.0003519357
Boson Index = 0.9996480643

Photoelectric:

PE_Nacaphite= 3.03 barns/electron
U=PE_Nacaphite x rElectron Density= 8.45 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Nacaphite is Not Radioactive

Nacaphite Classification

Dana Class:

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

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

(41.03.06)Dana Group

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

Strunz Class:

08.BO.05 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BO -With only large cations, (OH, etc.):RO4 ï¿½ 1:1

08.BO.05 Nacaphite Na(Na,Ca)2(PO4)F P1 1

Other Nacaphite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8, AmMin v93:706) OPTIC PROP.(AmMin, v93:706)

See Also:

Links to other databases for Nacaphite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info

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Print or Cut-and-Paste your Nacaphite Specimen Label here :

Nacaphite

Na(Na,Ca)2(PO4)F
Dana No: 41.03.06.01 Strunz No: 08.BO.05
Locality:

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