Lomonosovite Mineral Data

Lomonosovite Mineral Data +

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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.

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:

Lomonosovite Bornemanite

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 - PinacoidalH-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

Diaphaniety:

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

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:

r_electron=2.96 gm/cc
note: r_Lomonosovite=3.04 gm/cc.

Fermion Index

Fermion Index = 0.02986
Boson Index = 0.97014

Photoelectric:

PE_Lomonosovite= 4.19 barns/electron
U=PE_Lomonosovite x r_electron= 12.38 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Lomonosovite is Not Radioactive

Lomonosovite Classification

Dana Class:

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

(56.4)with [Si2O7] with phosphate, water

(56.4.1)Lomonosovite group

56.4.1.1 Lomonosovite Na5Ti2O2(Si2O7)(PO4) P1 1

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

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

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

Strunz Class:

VIII/C.14-70 VIII - Silicates

VIII/C - Sorosilicates with [Si2O7]6-, with anions unfamiliar to tetraheders [O,OH,F]

VIII/C.14 - Fresnoite - Belkovite series

VIII/C.14-20 Muirite Ba10Ca2MnTiSi10O30(OH,Cl,F)10 P 4/mmm 4/m 2/m 2/m

VIII/C.14-30 Belkovite! Ba3(Nb,Ti)6(Si2O7)2O12 P 62m 6 m2

VIII/C.14-40 Murmanite Na3(Ti,Nb)4(Si2O7)2O4·4(H2O) P1 ? 1

VIII/C.14-50 Epistolite Na4Nb2Ti(Si2O7)2O2(OH)2·4(H2O) P1 1

VIII/C.14-70 Lomonosovite Na5Ti2O2(Si2O7)(PO4) P1 1

VIII/C.14-80 Vuonnemite Na11Nb2TiSi4O12(PO4)2O5F2 P1 1

VIII/C.14-110 Bussenite! Na2(Ba,Sr)2(Fe,Mn)TiSi2O7(CO3)(OH)3F P1 1

VIII/C.14-120* Quadruphite-VII Na14CaMgTi4[Si2O7]2(PO4)4O4F2 P1 1

VIII/C.14-120 Quadruphite-VIII Na14CaMgTi4(Si2O7)2(PO4)4O4F2 P1 1

VIII/C.14-130 Sobolevite Na11(Na,Ca)4(Mg,Mn)Ti4(Si4O12)(PO4)4O5F3 P1 1

VIII/C.14-140* Polyphite-VII Na17Ca3Mg(Ti,Mn)4[Si2O7]2(PO4)6O2F6 P1 1

VIII/C.14-140 Polyphite-VIII Na17Ca3Mg(Ti,Mn)4[Si2O7]2(PO4)6O2F6 P1 1

Other Lomonosovite Information

References:

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

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Lomonosovite

Na5Ti2O2(Si2O7)(PO4)
Dana No: 56.4.1.1 Strunz No: VIII/C.14-70
Locality:

Notes: