Quadruphite-VIII Mineral Data

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.

Synonym:

IMA1990-026

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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 - PedialH-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

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Quadruphite-VIII

Electron Density:

r_electron=2.91 gm/cc
note: r_{Quadruphite-VIII}=2.99 gm/cc.

Fermion Index

Fermion Index = 0.02346
Boson Index = 0.97654

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Quadruphite-VIII is Not Radioactive

Quadruphite-VIII Classification

Dana Class:

56.4.1.3 (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.14-120 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 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 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Quadruphite-VIII

Na14CaMgTi4(Si2O7)2(PO4)4O4F2
Dana No: 56.4.1.3 Strunz No: VIII/C.14-120
Locality:

Notes: