Mineralogy Database

Lomonosovite Mineral Data

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General Lomonosovite Information

Help on Chemical  Formula: Chemical Formula: Na5Ti2O2(Si2O7)(PO4)
Help on Composition: Composition: Molecular Weight = 505.85 gm
   Sodium      22.72 %  Na   30.63 % Na2O
   Titanium    18.93 %  Ti   31.58 % TiO2
   Silicon     11.10 %  Si   23.76 % SiO2
   Phosphorus   6.12 %  P    14.03 % P2O5
   Oxygen      41.12 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na5Ti2O2Si2O7(PO4)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1950
Help on Locality: Locality: Lovozero alkaline complex, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Mikhail V. Lomonosov (1711-1765), Russian mineralogist and naturalist.
Help on Name Pronunciation: Name Pronunciation: Lomonosovite + Pronunciation Say LOMONOSOVITE
Help on Synonym: Synonym: ICSD 34069
  PDF 15-155

Lomonosovite Image

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Comments: Aegerine schist with reddish crystalline grains of lomonosovite.
Location: Ilimaussaq, Kvanefjeld, Greenland. Scale: Picture size 0.5 cm.
© John Veevaert

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  Bornemanite   Lomonosovite

Comments: Yellow crystalline bornemanite in dark brown lomonosovite.
Location: Yubileinaya Pegmatite, Lovozero Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Lomonosovite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.7721:1:2.0393
Help on Cell Dimensions: Cell Dimensions: a = 5.49, b = 7.11, c = 14.5, Z = 2; alpha = 101°, beta = 96°, gamma = 90° V = 552.55 Den(Calc)= 3.04
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.83(1), 1.778(0.9), 1.84(0.8),

Physical Properties of Lomonosovite

Help on Cleavage: Cleavage: {100} Perfect
Help on Color: Color: Dark brown, Pink violet, Black.
Help on Density: Density: 3.12 - 3.15, Average = 3.13
Help on Diaphaneity: Diaphaneity: Transparent to Subopaque
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 3-4 - Calcite-Fluorite
Help on Luster: Luster: Vitreous - Adamantine
Help on Streak: Streak: brown

Optical Properties of Lomonosovite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.092 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.064 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.241,KPDmeas= 0.2337,KC= 0.2574
Ncalc = 1.78 - 1.81
Help on Optical Data: Optical Data: Biaxial (-), a=1.67, b=1.75, g=1.778, bire=0.1080, 2V(Calc)=58, 2V(Meas)=56.
Help on Pleochroism (x): Pleochroism (x): nearly colorless or nearly colorless.
Help on Pleochroism (y): Pleochroism (y): dark brown or lilac.
Help on Pleochroism (z): Pleochroism (z): yellowish brown or yellowish brown.

Calculated Properties of Lomonosovite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.96 gm/cc
note: Specific Gravity of Lomonosovite =3.04 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PELomonosovite = 4.19 barns/electron
U=PELomonosovite x rElectron Density= 12.38 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Lomonosovite is Not Radioactive

Lomonosovite Classification

Help on  Dana Class: Dana Class: (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O
  (56.04)with [Si2O7] with phosphate, water
  (56.04.01)Lomonosovite group Lomonosovite Na5Ti2O2(Si2O7)(PO4) P1 1 Polyphite-VIII Na17Ca3Mg(Ti,Mn)4[Si2O7]2(PO4)6O2F6 P1 1 Quadruphite-VIII Na14CaMgTi4(Si2O7)2(PO4)4O4F2 P1 1 Sobolevite Na11(Na,Ca)4(Mg,Mn)Ti4(Si4O12)(PO4)4O5F3 P1 1
Help on  Strunz Class: Strunz Class: 09.BE.32 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BE -Si2O7 groups with additional anions;
09.BE.32 Lomonosovite Na5Ti2O2(Si2O7)(PO4) P1 1

Other Lomonosovite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Lomonosovite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 09.BE.32





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