Natrophosphate Mineral Data

Natrophosphate Mineral Data +

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General Natrophosphate Information

Chemical Formula:

Na7(PO4)2F·19(H2O)

Composition:

Molecular Weight = 712.16 gm

Sodium 22.60 % Na 30.46 % Na₂O

Phosphorus 8.70 % P 19.93 % P₂O₅

Hydrogen 5.38 % H 48.06 % H₂O

Oxygen 60.66 % O

Fluorine 2.67 % F 2.67 % F

- % F -1.12 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₇(PO₄)₂F·19(H₂O)

Environment:

Pegmatite central zone with ijolite-urtite.

IMA Status:

Approved IMA 1972

Locality:

Yukspor pegmatite, Mt. Khibina massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the composition.

Synonym:

ICSD 2156

PDF 25-831

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Natrophosphate Crystallography

Cell Dimensions:

a = 27.79, Z = 32; V = 21,461.78 Den(Calc)= 1.76

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F d3c

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

By Intensity(I/I_o): 2.67(1), 2.42(0.9), 8.18(0.7),

Crystal Structure:

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Baur W H , Tillmanns E , Acta Crystallographica, Section B , 30 (1974) p.2218-2224, Salt hydrates. X. The crystal structure determinations of heptasodium fluoride, bisphosphate 19-hydrate and heptasodium fluoride bisarsenate 19-hydrate and, the computer simulation of the isomorphous vanadate salt, Note: not all H were located, Locality: synthetic

Physical Properties of Natrophosphate

Cleavage:

[111] Indistinct

Color:

Colorless, White.

Density:

1.71 - 1.722, Average = 1.71

Diaphaniety:

Transparent

Fracture:

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

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

2.5 - Finger Nail

Luminescence:

Fluorescent, Short UV=weak orange.

Luster:

Vitreous - Greasy

Streak:

white

Optical Properties of Natrophosphate

Gladstone-Dale:

CI meas= -0.037 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.011 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2619,KPDmeas= 0.2686,KC= 0.259

Optical Data:

Isotropic, n=1.46-1.462.

Calculated Properties of Natrophosphate

Electron Density:

r_electron=1.83 gm/cc
note: r_{Natrophosphate}=1.76 gm/cc.

Fermion Index

Fermion Index = 0.00029
Boson Index = 0.99971

Photoelectric:

PE_{Natrophosphate}= 0.92 barns/electron
U=PE_{Natrophosphate} x r_electron= 1.68 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Natrophosphate is Not Radioactive

Natrophosphate Classification

Dana Class:

42.13.9.1 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.13)Dana Type

(42.13.9)Dana Group

42.13.9.1 Natrophosphate Na7(PO4)2F·19(H2O) F d3c 4/m 3 2/m

Strunz Class:

VII/D.26-10 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of very big and medium size: Al, Mg and Ca, Na, K

VII/D.26 - Natrophosphate series

VII/D.26-10 Natrophosphate Na7(PO4)2F·19(H2O) F d3c 4/m 3 2/m

Other Natrophosphate Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Natrophosphate :
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 -Athena 5 - EUROmin Project 6 -Google Images 7 -Google Scholar 8 -Handbook of Mineralogy (UofA) 9 -MinDAT 10 -MinMax(Deutsch) 11 -MinMax(English) 12 -Mineralienatlas (Deutsch) 13 -QUT Mineral Atlas 14 - WWW-MINCRYST 15 -École des Mines de Paris

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Natrophosphate

Na7(PO4)2F·19(H2O)
Dana No: 42.13.9.1 Strunz No: VII/D.26-10
Locality:

Notes: