Nefedovite Mineral Data

General Nefedovite Information

Chemical Formula:

Na5Ca4(PO4)4F

Composition:

Molecular Weight = 674.14 gm

Sodium 17.05 % Na 22.98 % Na₂O

Calcium 23.78 % Ca 33.27 % CaO

Phosphorus 18.38 % P 42.11 % P₂O₅

Oxygen 37.97 % O

Fluorine 2.82 % F 2.82 % F

- % F -1.19 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₅Ca₄(PO₄)₄F

Environment:

Pegmatitic segregations in nepheline syenite in a differentiated alkalic massif.

IMA Status:

Approved IMA 1983

Locality:

Mt. Yukspor and from a drillcore in the Kuniok River valley, Khibiny massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Yevgeny I. Nefedov (1910-1976), Russian mineralogist, St. Petersburg, Russia, involved in the discovery of a number of Kola minerals.

Name Pronunciation:

Nefedovite + Pronunciation

Synonym:

ICSD 20906

PDF 37-422

Nefedovite Crystallography

Axial Ratios:

a:b:c =0.4637:1:1.4153

Cell Dimensions:

a = 5.401, b = 11.647, c = 16.484, Z = 2; alpha = 134.99°, beta = 90.04°, gamma = 89.96° V = 733.35 Den(Calc)= 3.05

Crystal System:

Triclinic - Pedial H-M Symbol (1) Space Group: P1

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

By Intensity(I/I_o): 2.772(1), 2.29(0.8), 2.508(0.8),

Physical Properties of Nefedovite

Cleavage:

None

Color:

Colorless, White.

Density:

3.01

Diaphaneity:

Transparent

Fracture:

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

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Nefedovite

Gladstone-Dale:

CI meas= -0.005 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.008 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1903,KPDmeas= 0.1929,KC= 0.1919
Ncalc = 1.58 - 1.59

Optical Data:

Biaxial (+), a=1.571, g=1.59, bire=0.0190

Calculated Properties of Nefedovite

Electron Density:

Bulk Density (Electron Density)=2.96 gm/cc
note: Specific Gravity of Nefedovite =3.01 gm/cc.

Fermion Index:

Fermion Index = 0.0005032994
Boson Index = 0.9994967006

Photoelectric:

PE_Nefedovite= 4.10 barns/electron
U=PE_Nefedovite x rElectron Density= 12.17 barns/cc.

Radioactivity:

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

Nefedovite Classification

Dana Class:

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

(41.11)with miscellaneous formulae

(41.11.04)Dana Group

41.11.04.01 Nefedovite Na5Ca4(PO4)4F P1 1

Strunz Class:

08.BO.30 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.30 Nefedovite Na5Ca4(PO4)4F P1 1

Other Nefedovite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Nefedovite :
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 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

Search for Nefedovite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Nefedovite :

Ask about Nefedovite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Nefedovite

Na5Ca4(PO4)4F
Dana No: 41.11.04.01 Strunz No: 08.BO.30
Locality:

Notes:

Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.