Mineralogy Database

Nacaphite Mineral Data

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General Nacaphite Information

Help on Chemical  Formula: Chemical Formula: Na(Na,Ca)2(PO4)F
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Na2.3Ca0.7(PO4)F
Help on Environment: Environment: Hydrothermal assemblages.
Help on IMA Status: IMA Status: Approved IMA 1980
Help on Locality: Locality: Khibiny alkaline massif, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the composition (NaCa, Phosphate).
Help on Name Pronunciation: Name Pronunciation: Nacaphite + Pronunciation Say NACAPHITE
Help on Synonym: Synonym: ICSD 51234
  PDF 33-1222

Nacaphite Image

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  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

Help on Axial Ratios: Axial Ratios: a:b:c =0.436:1:0.2905
Help on Cell Dimensions: 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
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.649(1), 3.054(0.45), 3.049(0.4),

Physical Properties of Nacaphite

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless, White.
Help on Density: Density: 2.85
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Nacaphite

Help on Gladstone-Dale: 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
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.79 gm/cc
note: Specific Gravity of Nacaphite =2.85 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0003519357
Boson Index = 0.9996480643
Help on Photoelectric: Photoelectric: PENacaphite = 3.03 barns/electron
U=PENacaphite x rElectron Density= 8.45 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Nacaphite is Not Radioactive

Nacaphite Classification

Help on  Dana Class: Dana Class: (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
  (41.03)where (A B)3 (XO4) Zq
  (41.03.06)Dana Group Nacaphite Na(Na,Ca)2(PO4)F P1 1
Help on  Strunz Class: 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 � 1:1
08.BO.05 Nacaphite Na(Na,Ca)2(PO4)F P1 1

Other Nacaphite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8, AmMin v93:706) OPTIC PROP.(AmMin, v93:706)
Help on See Also: 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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Dana No: Strunz No: 08.BO.05





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