Natrophilite Mineral Data

General Natrophilite Information

Chemical Formula:

NaMnPO4

Composition:

Molecular Weight = 172.90 gm

Sodium 13.30 % Na 17.92 % Na₂O

Manganese 31.77 % Mn 41.03 % MnO

Phosphorus 17.91 % P 41.05 % P₂O₅

Oxygen 37.01 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaMn²⁺(PO₄)

Environment:

Replacing lithiophilite, in a complex granite pegmatite.

IMA Status:

Valid Species (Pre-IMA) 1890

Locality:

Branchville, Fairfield Co., Connecticut, USA. Link to MinDat.org Location Data.

Name Origin:

Named for its content of sodium, natrium, and from the Greek for a friend.

Name Pronunciation:

Natrophilite + Pronunciation

Synonym:

ICSD 201771

PDF 25-846

Natrophilite Image

Images:

Natrophilite

Comments: Natrophilite with lithiophilite.
Location: Abija N. Fillow Quarry (Branchville Quarry), Branchville, Redding, Fairfield Co., Connecticut, USA. Scale: Specimen Size 3.7 x 2.2 x 1.9 cm.
© Rob Lavinsky

Natrophilite Crystallography

Axial Ratios:

a:b:c =2.106:1:1.258

Cell Dimensions:

a = 10.53, b = 5, c = 6.29, Z = 4; V = 331.17 Den(Calc)= 3.47

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pnam

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

By Intensity(I/I_o): 2.72(1), 2.6(0.8), 3.72(0.7),

Crystal Structure:

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drag2 - RMB Resize/Rotate
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H - Help Screen
I - Data Info
A - Atoms On/Off
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Moore P B , American Mineralogist , 57 (1972) p.1333-1344, Natrophilite, NaMn(PO4), has ordered cations

Physical Properties of Natrophilite

Cleavage:

{100} Good, {010} Indistinct

Color:

Yellow.

Density:

3.41

Diaphaneity:

Transparent to Translucent

Fracture:

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

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

4.5-5 - Near Apatite

Luminescence:

Non-fluorescent.

Luster:

Resinous

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Natrophilite

Gladstone-Dale:

CI meas= -0.044 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.026 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1949,KPDmeas= 0.1983,KC= 0.19
Ncalc = 1.65 - 1.66

Optical Data:

Biaxial (+), a=1.671, b=1.674, g=1.684, bire=0.0130, 2V(Calc)=58, 2V(Meas)=75. Dispersion relatively strong.

Calculated Properties of Natrophilite

Electron Density:

Bulk Density (Electron Density)=3.33 gm/cc
note: Specific Gravity of Natrophilite =3.47 gm/cc.

Fermion Index:

Fermion Index = 0.0001776691
Boson Index = 0.9998223309

Photoelectric:

PE_Natrophilite= 9.25 barns/electron
U=PE_Natrophilite x rElectron Density= 30.81 barns/cc.

Radioactivity:

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

Natrophilite Classification

Dana Class:

38.01.01.03 (38)Anhydrous Phosphates, etc

(38.01)A+ B++ XO4

(38.01.01)Triphylite Group

38.01.01.01 Triphylite LiFePO4 Pbnm 2/m 2/m 2/m

38.01.01.02 Lithiophilite LiMnPO4 Pmnb 2/m 2/m 2/m

38.01.01.03 Natrophilite NaMnPO4 Pnam 2/m 2/m 2/m

Strunz Class:

08.AB.10 08 - PHOSPHATES, ARSENATES, VANADATES

08.A - Phosphates, etc. without additional anions, without H2O

08.AB -With medium-sized cations

08.AB.10 Ferrisicklerite Li(Fe,Mn)PO4 Pmnb 2/m 2/m 2/m

08.AB.10 Heterosite FePO4 Pmnb 2/m 2/m 2/m

08.AB.10 Natrophilite NaMnPO4 Pnam 2/m 2/m 2/m

08.AB.10 Lithiophilite LiMnPO4 Pmnb 2/m 2/m 2/m

08.AB.10 Purpurite MnPO4 Pmnb 2/m 2/m 2/m

08.AB.10 Sicklerite Li(Mn,Fe)PO4 Pmnb 2/m 2/m 2/m

08.AB.10 Simferite Li(Mg,Fe,Mn)2(PO4)2 Pbnm or Pbn21 Ortho

08.AB.10 Triphylite LiFePO4 Pbnm 2/m 2/m 2/m

Other Natrophilite Information

References:

NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Natrophilite :
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

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Ask about Natrophilite here :
Ask-A-Mineralogist from the Mineralogical Society of America
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Print or Cut-and-Paste your Natrophilite Specimen Label here :

Natrophilite

NaMnPO4
Dana No: 38.01.01.03 Strunz No: 08.AB.10
Locality:

Notes: