Quadruphite-VIII Mineral Data

General Quadruphite-VIII Information

Chemical Formula:

Na14CaMgTi4(Si2O7)2(PO4)4O4F2

Composition:

Molecular Weight = 1,395.97 gm

Sodium 23.06 % Na 31.08 % Na₂O

Calcium 2.87 % Ca 4.02 % CaO

Magnesium 1.74 % Mg 2.89 % MgO

Titanium 13.72 % Ti 22.89 % TiO₂

Silicon 8.05 % Si 17.22 % SiO₂

Phosphorus 8.88 % P 20.34 % P₂O₅

Oxygen 38.97 % O

Fluorine 2.72 % F 2.72 % F

- % F -1.15 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₁₄CaMgTi₄(Si₂O₇)₂(PO₄)₄O₄F₂

IMA Status:

Approved IMA 1992

Locality:

Mt. Alluaiv in the NW part of the Lovozero alkaline massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the Latin "quadruplex" and the element phosphorus, for the quantity of PO4 groups in the formula.

Name Pronunciation:

Quadruphite-VIII + Pronunciation

Synonym:

IMA1990-026

Quadruphite-VIII Crystallography

Axial Ratios:

a:b:c =0.7647:1:2.8724

Cell Dimensions:

a = 5.415, b = 7.081, c = 20.34, Z = 1; alpha = 86.85°, beta = 94.4°, gamma = 89.94° V = 776.44 Den(Calc)= 2.99

Crystal System:

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

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

By Intensity(I/I_o): 2.88(1), 2.702(0.8), 2.636(0.7),

Physical Properties of Quadruphite-VIII

Color:

Brown.

Density:

3.12

Diaphaneity:

Transparent to Translucent

Hardness:

5 - Apatite

Luster:

Vitreous - Resinous

Optical Properties of Quadruphite-VIII

Gladstone-Dale:

CI meas= 0.098 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.059 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2235,KPDmeas= 0.2142,KC= 0.2375
Ncalc = 1.71 - 1.74

Optical Data:

Biaxial (-), a=1.63, b=1.678, g=1.697, bire=0.0670

Calculated Properties of Quadruphite-VIII

Electron Density:

Bulk Density (Electron Density)=2.91 gm/cc
note: Specific Gravity of Quadruphite-VIII =2.99 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_{Quadruphite-VIII}= 3.76 barns/electron
U=PE_{Quadruphite-VIII} x rElectron Density= 10.94 barns/cc.

Radioactivity:

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

Quadruphite-VIII Classification

Dana Class:

56.04.01.03 (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.45 09 - SILICATES (Germanates)

09.B - Sorosilicates

09.BE -Si2O7 groups with additional anions;

09.BE.45 Quadruphite-VII Na14CaMgTi4[Si2O7]2(PO4)4O4F2 P1 1

09.BE.45 Quadruphite-VIII Na14CaMgTi4(Si2O7)2(PO4)4O4F2 P1 1

09.BE.45 Polyphite-VII Na17Ca3Mg(Ti,Mn)4[Si2O7]2(PO4)6O2F6 P1 1

Other Quadruphite-VIII Information

References:

NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.78,p1316,1993) OPTIC PROP.(Am.Min.,Vol.78,p1316,1993)

See Also:

Links to other databases for Quadruphite-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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Quadruphite-VIII

Na14CaMgTi4(Si2O7)2(PO4)4O4F2
Dana No: 56.04.01.03 Strunz No: 09.BE.45
Locality:

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