Murmanite Mineral Data

Murmanite Mineral Data +

General Murmanite Information

Chemical Formula:

Na3(Ti,Nb)4(Si2O7)2O4·4(H2O)

Composition:

Molecular Weight = 750.89 gm

Sodium 9.18 % Na 12.38 % Na₂O

Titanium 22.96 % Ti 38.30 % TiO₂

Niobium 4.95 % Nb 7.08 % Nb₂O₅

Silicon 14.96 % Si 32.01 % SiO₂

Hydrogen 1.07 % H 9.60 % H₂O

Oxygen 46.88 % O

______ ______

100.00 % 99.36 % = TOTAL OXIDE

Empirical Formula:

Na₃Ti_3.6Nb_0.4(Si₂O₇)₂O₄·4(H₂O)

Environment:

Supergene alteration product of lomonsovite.

IMA Status:

Valid Species (Pre-IMA) 1923

Locality:

Lu Javr and Hibina districts, Lovozero Massif, Murmansk, Kola peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named apparently for the locality.

Synonym:

ICSD 62278

PDF 40-479

Murmanite Image

Images:

Murmanite

Comments: Metavolcanic matrix hosting several bright pink lath shaped crystals of murmanite.
Location: Ilimaussaq, Illua, Greenland. Scale: Crystal size 1.6 cm.
© John Veevaert

Murmanite Crystallography

Axial Ratios:

a:b:c =0.9967:1:1.3368

Cell Dimensions:

a = 8.7, b = 8.728, c = 11.668, Z = 2; alpha = 94.31°, beta = 98.62°, gamma = 105.62° V = 841.25 Den(Calc)= 2.96

Crystal System:

Triclinic - PedialH-M Symbol (1) Space Group: P1 ?

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

By Intensity(I/I_o): 11.6(1), 2.86(0.8), 5.7(0.6),

Physical Properties of Murmanite

Cleavage:

[001] Perfect

Color:

Pink, Bright pink, Silvery, Yellow, Brown.

Density:

2.64 - 2.84, Average = 2.74

Diaphaniety:

Transparent to translucent to opaque

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

2.5-3 - Finger Nail-Calcite

Luster:

Vitreous - Greasy

Streak:

white

Optical Properties of Murmanite

Gladstone-Dale:

CI meas= 0.043 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.114 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2589,KPDmeas= 0.2797,KC= 0.2922

Optical Data:

Biaxial (-), a=1.682-1.735, b=1.765-1.77, g=1.807-1.839, bire=0.1040-0.1250, 2V(Calc)=66-74, 2V(Meas)=57-64. Dispersion r > v weak.

Pleochroism (x):

pale rose or rose.

Pleochroism (y):

light brown or light yellowish brown.

Pleochroism (z):

dark brown or violet brown.

Calculated Properties of Murmanite

Electron Density:

r_electron=2.69 gm/cc
note: r_Murmanite=2.74 gm/cc.

Fermion Index

Fermion Index = 0.03689
Boson Index = 0.96311

Photoelectric:

PE_Murmanite= 11.62 barns/electron
U=PE_Murmanite x r_electron= 31.25 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Murmanite is Not Radioactive

Murmanite Classification

Dana Class:

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

(56.2)with cations in [4] and/or >[4] coordination

(56.2.7)Murmanite group

56.2.7.1 Epistolite Na4Nb2Ti(Si2O7)2O2(OH)2·4(H2O) P1 1

56.2.7.2 Murmanite Na3(Ti,Nb)4(Si2O7)2O4·4(H2O) P1 ? 1

56.2.7.3 Shkatulkalite! Na10MnTi3Nb3(Si2O7)6(OH)2F·12(H2O) P 2,Pm,P 2/m Mono

Strunz Class:

VIII/C.14-40 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 Murmanite Information

References:

NAME( Ford32) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

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Murmanite

Na3(Ti,Nb)4(Si2O7)2O4·4(H2O)
Dana No: 56.2.7.2 Strunz No: VIII/C.14-40
Locality:

Notes: