Polyphite-VIII Mineral Data

General Polyphite-VIII Information

Chemical Formula:

Na17Ca3Mg(Ti,Mn)4[Si2O7]2(PO4)6O2F6

Composition:

Molecular Weight = 1,786.09 gm

Sodium 21.88 % Na 29.50 % Na₂O

Calcium 6.73 % Ca 9.42 % CaO

Magnesium 1.36 % Mg 2.26 % MgO

Titanium 8.04 % Ti 13.42 % TiO₂

Manganese 3.08 % Mn 4.42 % Mn₂O₃

Silicon 6.29 % Si 13.46 % SiO₂

Phosphorus 10.40 % P 23.84 % P₂O₅

Oxygen 35.83 % O

Fluorine 6.38 % F 6.38 % F

- % F -2.69 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₁₇Ca₃MgTi₃Mn³⁺(Si₂O₇)₂(PO₄)₆O₂F₆

Environment:

In ultra-agpaitic pegmatites in a differentiated alkaline massif.

IMA Status:

Approved IMA 1992

Locality:

Lovozero alkaline complex, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named from the Greek for "many" and PHosphorus for the multiple phosphate anions in the formula.

Name Pronunciation:

Polyphite-VIII + Pronunciation

Synonym:

IMA1990-025

Polyphite-VIII Crystallography

Axial Ratios:

a:b:c =0.7645:1:3.7519

Cell Dimensions:

a = 5.412, b = 7.079, c = 26.56, Z = 1; alpha = 95.21°, beta = 93.51°, gamma = 90.1° V = 1,011.45 Den(Calc)= 2.93

Crystal System:

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

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

By Intensity(I/I_o): 2.937(1), 2.702(0.9), 2.659(0.8),

Physical Properties of Polyphite-VIII

Color:

Brown.

Density:

3.07

Diaphaneity:

Transparent to Translucent

Hardness:

5 - Apatite

Luster:

Vitreous - Resinous

Optical Properties of Polyphite-VIII

Gladstone-Dale:

CI meas= 0.05 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.004 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.22,KPDmeas= 0.21,KC= 0.221
Ncalc = 1.65 - 1.68

Optical Data:

Biaxial (-), a=1.6, b=1.658, g=1.676, bire=0.0760, 2V(Calc)=56, 2V(Meas)=56.

Calculated Properties of Polyphite-VIII

Electron Density:

Bulk Density (Electron Density)=2.85 gm/cc
note: Specific Gravity of Polyphite-VIII =2.93 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Polyphite-VIII}= 4.09 barns/electron
U=PE_{Polyphite-VIII} x rElectron Density= 11.67 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Polyphite-VIII is Not Radioactive

Polyphite-VIII Classification

Dana Class:

56.04.01.02 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O

(56.04)with [Si2O7] with phosphate, water

(56.04.01)Lomonosovite group

56.04.01.01 Lomonosovite Na5Ti2O2(Si2O7)(PO4) P1 1

56.04.01.02 Polyphite-VIII Na17Ca3Mg(Ti,Mn)4[Si2O7]2(PO4)6O2F6 P1 1

56.04.01.03 Quadruphite-VIII Na14CaMgTi4(Si2O7)2(PO4)4O4F2 P1 1

56.04.01.04 Sobolevite Na11(Na,Ca)4(Mg,Mn)Ti4(Si4O12)(PO4)4O5F3 P1 1

Strunz Class:

09.BE.407. 09 - SILICATES (Germanates)

09.B - Sorosilicates

09.BE -Si2O7 groups with additional anions;

09.BE.407. Polyphite-VIII Na17Ca3Mg(Ti,Mn)4[Si2O7]2(PO4)6O2F6 P1 1

Other Polyphite-VIII Information

References:

PHYS. PROP.(Am.Min.,Vol.78,p1316,1993) OPTIC PROP.(Am.Min.,Vol.78,p1316,1993)

See Also:

Links to other databases for Polyphite-VIII :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Polyphite-VIII

Na17Ca3Mg(Ti,Mn)4[Si2O7]2(PO4)6O2F6
Dana No: 56.04.01.02 Strunz No: 09.BE.407.
Locality:

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