Murmanite Mineral Data

General Murmanite Information

Chemical Formula:

(Na,[ ])2{(Na,Ti)4[Ti2(O,H2O)4Si4O14](OH,F)2}•2H2O

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.

Name Pronunciation:

Murmanite + Pronunciation

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 - Pedial H-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

Diaphaneity:

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= 0.12 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2572,KPDmeas= 0.2797,KC= 0.2922
Ncalc = 1.77 - 1.87

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:

Bulk Density (Electron Density)=2.69 gm/cc
note: Specific Gravity of Murmanite =2.74 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Murmanite= 11.62 barns/electron
U=PE_Murmanite x rElectron Density= 31.25 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Murmanite is Not Radioactive

Murmanite Classification

Dana Class:

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

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

(56.02.07)Murmanite group

56.02.07.01 Epistolite (Na,[])2{(Na,Ti)4[Nb2(O,H2O)4Si4O14](OH,F)2}•2H2O P1 1

56.02.07.02 Murmanite (Na,[])2{(Na,Ti)4[Ti2(O,H2O)4Si4O14](OH,F)2}•2H2O P1 ? 1

56.02.07.03 Shkatulkalite! {(Na,Mn,Ca,[])4[Nb2(O,H2O)4Si4O14](OH,F)2}•2(H2O,[]) P 2,Pm,P 2/m Mono

Strunz Class:

09.BE.27 09 - SILICATES (Germanates)

09.B - Sorosilicates

09.BE -Si2O7 groups with additional anions;

09.BE.27 Murmanite (Na,[])2{(Na,Ti)4[Ti2(O,H2O)4Si4O14](OH,F)2}•2H2O P1 ? 1

Other Murmanite Information

References:

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

See Also:

Links to other databases for Murmanite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST
17 - theimage

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Print or Cut-and-Paste your Murmanite Specimen Label here :

Murmanite

(Na,[ ])2{(Na,Ti)4[Ti2(O,H2O)4Si4O14](OH,F)2}•2H2O
Dana No: 56.02.07.02 Strunz No: 09.BE.27
Locality:

Notes:

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