Polyphite-VIII Mineral Data

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.

Synonym:

IMA1990-025

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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 - PedialH-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

Diaphaniety:

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

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:

r_electron=2.85 gm/cc
note: r_{Polyphite-VIII}=2.93 gm/cc.

Fermion Index

Fermion Index = 0.01495
Boson Index = 0.98505

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Polyphite-VIII is Not Radioactive

Polyphite-VIII Classification

Dana Class:

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

(56.4)with [Si2O7] with phosphate, water

(56.4.1)Lomonosovite group

56.4.1.1 Lomonosovite Na5Ti2O2(Si2O7)(PO4) P1 1

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

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

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

Strunz Class:

VIII/C.14-140 VIII - Silicates

VIII/C - Sorosilicates with [Si2O7]6-, with anions unfamiliar to tetraheders [O,OH,F]

VIII/C.14 - Fresnoite - Belkovite series

VIII/C.14-20 Muirite Ba10Ca2MnTiSi10O30(OH,Cl,F)10 P 4/mmm 4/m 2/m 2/m

VIII/C.14-30 Belkovite! Ba3(Nb,Ti)6(Si2O7)2O12 P 62m 6 m2

VIII/C.14-40 Murmanite Na3(Ti,Nb)4(Si2O7)2O4·4(H2O) P1 ? 1

VIII/C.14-50 Epistolite Na4Nb2Ti(Si2O7)2O2(OH)2·4(H2O) P1 1

VIII/C.14-70 Lomonosovite Na5Ti2O2(Si2O7)(PO4) P1 1

VIII/C.14-80 Vuonnemite Na11Nb2TiSi4O12(PO4)2O5F2 P1 1

VIII/C.14-110 Bussenite! Na2(Ba,Sr)2(Fe,Mn)TiSi2O7(CO3)(OH)3F P1 1

VIII/C.14-120* Quadruphite-VII Na14CaMgTi4[Si2O7]2(PO4)4O4F2 P1 1

VIII/C.14-120 Quadruphite-VIII Na14CaMgTi4(Si2O7)2(PO4)4O4F2 P1 1

VIII/C.14-130 Sobolevite Na11(Na,Ca)4(Mg,Mn)Ti4(Si4O12)(PO4)4O5F3 P1 1

VIII/C.14-140* Polyphite-VII Na17Ca3Mg(Ti,Mn)4[Si2O7]2(PO4)6O2F6 P1 1

VIII/C.14-140 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 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Polyphite-VIII

Na17Ca3Mg(Ti,Mn)4[Si2O7]2(PO4)6O2F6
Dana No: 56.4.1.2 Strunz No: VIII/C.14-140
Locality:

Notes: