Murmanite Mineral Data
Murmanite Mineral Data
· archived 5/18/2026, 12:42:03 AMscreenshotcached html Murmanite Mineral Data Murmanite Mineral Data Search Webmineral : Home Crystal jmol jPOWD Chem X Ray Dana Strunz Properties A to Z Images Share AddThis News Help About Advertisment 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: Na3Ti3.6Nb0.4(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/Io): 11.6(1), 2.86(0.8), 5.7(0.6), Crystal Structure: Mouse drag1 - LMB Manipulate Structure drag2 - RMB Resize/Rotate Keyboard S - Stereo Pair on/off H - Help Screen I - Data Info A - Atoms On/Off P - Polyhedra On/Off B - Bonds On/Off Help on Above 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= 0.2922Ncalc = 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/ccnote: Specific Gravity of Murmanite =2.74 gm/cc. Fermion Index: Fermion Index = 0.03Boson Index = 0.97 Photoelectric: PEMurmanite = 11.62 barns/electronU=PEMurmanite 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 56.02.07.03 Shkatulkalite! {(Na,Mn,Ca,[])4[Nb2(O,H2O)4Si4O14](OH,F)2}•2(H2O,[]) P 2,Pm,P 2/m