Mineralogy Database

Murmanite Mineral Data

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General Murmanite Information

Help on Chemical  Formula: Chemical Formula: (Na,[ ])2{(Na,Ti)4[Ti2(O,H2O)4Si4O14](OH,F)2}•2H2O
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Na3Ti3.6Nb0.4(Si2O7)2O4•4(H2O)
Help on Environment: Environment: Supergene alteration product of lomonsovite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1923
Help on Locality: Locality: Lu Javr and Hibina districts, Lovozero Massif, Murmansk, Kola peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named apparently for the locality.
Help on Name Pronunciation: Name Pronunciation: Murmanite + Pronunciation Say MURMANITE
Help on Synonym: Synonym: ICSD 62278
  PDF 40-479

Murmanite Image

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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

Help on Axial Ratios: Axial Ratios: a:b:c =0.9967:1:1.3368
Help on Cell Dimensions: 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
Help on Crystal System: Crystal System: Triclinic - Pedial H-M Symbol (1) Space Group: P1 ?
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 11.6(1), 2.86(0.8), 5.7(0.6),

Physical Properties of Murmanite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Pink, Bright pink, Silvery, Yellow, Brown.
Help on Density: Density: 2.64 - 2.84, Average = 2.74
Help on Diaphaneity: Diaphaneity: Transparent to translucent to opaque
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 2.5-3 - Finger Nail-Calcite
Help on Luster: Luster: Vitreous - Greasy
Help on Streak: Streak: white

Optical Properties of Murmanite

Help on Gladstone-Dale: 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
Help on Optical Data: 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.
Help on Pleochroism (x): Pleochroism (x): pale rose or rose.
Help on Pleochroism (y): Pleochroism (y): light brown or light yellowish brown.
Help on Pleochroism (z): Pleochroism (z): dark brown or violet brown.

Calculated Properties of Murmanite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.69 gm/cc
note: Specific Gravity of Murmanite =2.74 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEMurmanite = 11.62 barns/electron
U=PEMurmanite x rElectron Density= 31.25 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Murmanite is Not Radioactive

Murmanite Classification

Help on  Dana Class: Dana Class: (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 Epistolite (Na,[])2{(Na,Ti)4[Nb2(O,H2O)4Si4O14](OH,F)2}•2H2O P1 1 Murmanite (Na,[])2{(Na,Ti)4[Ti2(O,H2O)4Si4O14](OH,F)2}•2H2O P1 ? 1 Shkatulkalite! {(Na,Mn,Ca,[])4[Nb2(O,H2O)4Si4O14](OH,F)2}•2(H2O,[]) P 2,Pm,P 2/m Mono
Help on  Strunz Class: 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

Help on References: References: NAME( Ford32) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: 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
17 - theimage

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


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





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