Natrophilite Mineral Data

Natrophilite Mineral Data +

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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)

IMA Status:

Valid Species (Pre-IMA) 1890

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 201771

PDF 25-846

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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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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

Diaphaniety:

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

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:

r_electron=3.33 gm/cc
note: r_Natrophilite=3.47 gm/cc.

Fermion Index

Fermion Index = 0.00017
Boson Index = 0.99983

Photoelectric:

PE_Natrophilite= 9.25 barns/electron
U=PE_Natrophilite x r_electron= 30.81 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Natrophilite is Not Radioactive

Natrophilite Classification

Dana Class:

38.1.1.3 (38)Anhydrous Phosphates, etc

(38.1)A+ B++ XO4

(38.1.1)Dana Group

38.1.1.1 Triphylite LiFePO4 Pbnm 2/m 2/m 2/m

38.1.1.2 Lithiophilite LiMnPO4 Pmnb 2/m 2/m 2/m

38.1.1.3 Natrophilite NaMnPO4 Pnam 2/m 2/m 2/m

Strunz Class:

VII/A.02-80 VII - Phosphates, Arsenates and Vanadates

VII/A - Waterfree phosphates [PO4]3- without unfamiliar anions. cations of medium size: Mostly Fe, Mn

VII/A.02 - Simferrite - Natrophilite series

VII/A.02-05 Simferite Li(Mg,Fe,Mn)2(PO4)2 Pbnm,Pbn21 Ortho

VII/A.02-10 Triphylite LiFePO4 Pbnm 2/m 2/m 2/m

VII/A.02-20 Lithiophilite LiMnPO4 Pmnb 2/m 2/m 2/m

VII/A.02-30 Ferrisicklerite Li(Fe,Mn)PO4 Pmnb 2/m 2/m 2/m

VII/A.02-40 Sicklerite Li(Mn,Fe)PO4 Pmnb 2/m 2/m 2/m

VII/A.02-50 Heterosite FePO4 Pmnb 2/m 2/m 2/m

VII/A.02-60 Purpurite MnPO4 Pmnb 2/m 2/m 2/m

VII/A.02-70 Maricite NaFePO4 Pmnb 2/m 2/m 2/m

VII/A.02-80 Natrophilite NaMnPO4 Pnam 2/m 2/m 2/m

Other Natrophilite Information

References:

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Natrophilite

NaMnPO4
Dana No: 38.1.1.3 Strunz No: VII/A.02-80
Locality:

Notes: