Lomonosovite Mineral Data

General Lomonosovite Information

Chemical Formula:

Na5Ti2O2(Si2O7)(PO4)

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

Empirical Formula:

Na₅Ti₂O₂Si₂O₇(PO₄)

IMA Status:

Valid Species (Pre-IMA) 1950

Locality:

Lovozero alkaline complex, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Mikhail V. Lomonosov (1711-1765), Russian mineralogist and naturalist.

Name Pronunciation:

Lomonosovite + Pronunciation

Synonym:

ICSD 34069

PDF 15-155

Lomonosovite Image

Images:

Lomonosovite

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

Images:

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

Axial Ratios:

a:b:c =0.7721:1:2.0393

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

Crystal System:

Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.83(1), 1.778(0.9), 1.84(0.8),

Physical Properties of Lomonosovite

Cleavage:

{100} Perfect

Color:

Dark brown, Pink violet, Black.

Density:

3.12 - 3.15, Average = 3.13

Diaphaneity:

Transparent to Subopaque

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

3-4 - Calcite-Fluorite

Luster:

Vitreous - Adamantine

Streak:

brown

Optical Properties of Lomonosovite

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

Optical Data:

Biaxial (-), a=1.67, b=1.75, g=1.778, bire=0.1080, 2V(Calc)=58, 2V(Meas)=56.

Pleochroism (x):

nearly colorless or nearly colorless.

Pleochroism (y):

dark brown or lilac.

Pleochroism (z):

yellowish brown or yellowish brown.

Calculated Properties of Lomonosovite

Electron Density:

Bulk Density (Electron Density)=2.96 gm/cc
note: Specific Gravity of Lomonosovite =3.04 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Lomonosovite= 4.19 barns/electron
U=PE_Lomonosovite x rElectron Density= 12.38 barns/cc.

Radioactivity:

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

Lomonosovite Classification

Dana Class:

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

(56.04)with [Si2O7] with phosphate, water

(56.04.01)Lomonosovite group

56.04.01.01 Lomonosovite Na5Ti2O2(Si2O7)(PO4) P1 1

56.04.01.02 Polyphite-VIII Na17Ca3Mg(Ti,Mn)4[Si2O7]2(PO4)6O2F6 P1 1

56.04.01.03 Quadruphite-VIII Na14CaMgTi4(Si2O7)2(PO4)4O4F2 P1 1

56.04.01.04 Sobolevite Na11(Na,Ca)4(Mg,Mn)Ti4(Si4O12)(PO4)4O5F3 P1 1

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

References:

NAME( Dana8) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(Dana8)

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
15 - WWW-MINCRYST

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Lomonosovite

Na5Ti2O2(Si2O7)(PO4)
Dana No: 56.04.01.01 Strunz No: 09.BE.32
Locality:

Notes:

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