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 - PedialH-M Symbol (1) Space Group: P1 ? X Ray Diffraction: By Intensity(I/I_o): 11.6(1), 2.86(0.8), 5.7(0.6), Crystal Structure:

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Khalilov A D , Mamedov K S , Makarov E S , Pyanzina L A , Doklady Akademii Nauk SSSR , 161 (1965) p.1409-1411, Crystal structure of murmanite

 

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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