Panethite Mineral Data

Panethite Mineral Data +

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General Panethite Information

Chemical Formula:

(Na,Ca,K)2(Mg,Fe++,Mn)2(PO4)2

Composition:

Molecular Weight = 323.06 gm

Potassium 2.42 % K 2.92 % K₂O

Sodium 8.54 % Na 11.51 % Na₂O

Calcium 7.44 % Ca 10.41 % CaO

Magnesium 9.03 % Mg 14.97 % MgO

Manganese 3.40 % Mn 4.39 % MnO

Iron 10.37 % Fe 13.34 % FeO

Phosphorus 19.18 % P 43.94 % P₂O₅

Oxygen 39.62 % O

______ ______

100.00 % 101.49 % = TOTAL OXIDE

Empirical Formula:

Na_1.2Ca_0.6K_0.2Mg_1.2Fe²⁺_0.6Mn²⁺_0.2(PO₄)₂

Environment:

Intersteller space.

IMA Status:

Approved IMA 1967

Locality:

Dayton meteorite, Montgomery County, Ohio, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Friedrich Adolph Paneth (1887-1958), director of the Max-Planck Institute of Chemistry, Mainz, Germay.

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Panethite Crystallography

Axial Ratios:

a:b:c =0.6832:1:1.7362

Cell Dimensions:

a = 10.18, b = 14.9, c = 25.87, Z = 22; beta = 91.1° V = 3,923.29 Den(Calc)= 3.01

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/n

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

By Intensity(I/I_o): 3.007(1), 2.71(0.7), 5.1(0.6),

Physical Properties of Panethite

Color:

Brownish yellow.

Density:

2.9 - 3, Average = 2.95

Diaphaniety:

Transparent

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Luster:

Vitreous (Glassy)

Optical Properties of Panethite

Gladstone-Dale:

CI meas= -0.005 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.015 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1907,KPDmeas= 0.1946,KC= 0.1935

Optical Data:

Biaxial (-), a=1.567, b=1.576, g=1.579, bire=0.0120, 2V(Calc)=58, 2V(Meas)=51.

Calculated Properties of Panethite

Electron Density:

r_electron=2.89 gm/cc
note: r_Panethite=2.95 gm/cc.

Fermion Index

Fermion Index = 0.01152
Boson Index = 0.98848

Photoelectric:

PE_Panethite= 6.36 barns/electron
U=PE_Panethite x r_electron= 18.35 barns/cc.

Radioactivity:

GRapi = 34.14 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Panethite - barely detectable

Panethite Classification

Dana Class:

38.1.6.1 (38)Anhydrous Phosphates, etc

(38.1)A+ B++ XO4

(38.1.6)Dana Group

38.1.6.1 Panethite (Na,Ca,K)2(Mg,Fe,Mn)2(PO4)2 P 2₁/n 2/m

Strunz Class:

VII/A.05-30 VII - Phosphates, Arsenates and Vanadates

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

VII/A.05 - Farringtonite - Strontiowhitlockite series

VII/A.05-10 Farringtonite Mg3(PO4)2 P 2₁/a 2/m

VII/A.05-20 Stanfieldite Ca4(Mg,Fe,Mn)5(PO4)6 P 2/c 2/m

VII/A.05-30 Panethite (Na,Ca,K)2(Mg,Fe,Mn)2(PO4)2 P 2₁/n 2/m

VII/A.05-40 Brianite Na2CaMg(PO4)2 P 2₁/a 2/m

VII/A.05-46 Tuite! Ca3(PO4)2 R 3m 3m

VII/A.05-50 Whitlockite Ca9(Mg,Fe)(PO4)6(PO3OH) R 3c 3m

VII/A.05-60 Strontiowhitlockite Sr7(Mg,Ca)3(PO4)6[PO3(OH)] R 3c 3m

Other Panethite Information

References:

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

See Also:

Links to other databases for Panethite :
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 -École des Mines de Paris

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Panethite

(Na,Ca,K)2(Mg,Fe++,Mn)2(PO4)2
Dana No: 38.1.6.1 Strunz No: VII/A.05-30
Locality:

Notes: