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Betalomonosovite

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Formula:
Na64Ti4(Si2O7)2[PO3(OH)][PO2(OH)2]O2(OF)
System:
Triclinic
Colour:
Yellowish-brown
Name:
In allusion to its close relation with Lomonosovite.
First described by Gerasimovskiy and Kazakova (1962) from two pegmatites on the left and right banks of the Tyul'bnyunuai River, Lovozero massif, Kola, Russia. The status of betalomonosovite has been much discussed cause to difficulties of obtaining valid results on structure and chemical analysis. The poor quality of the crystals was related to an extensive cation and anion disorder present in the structure, including H2O (Sokolova et al. 2015). Betalomonosovite was, as a result discredited by IMA in 2013 (removed from the IMA list). Later Sokolova et al (2015) succeeded in refining the structure. Based on their work, betalomonosovite was reapproved by IMA in 2015 (IMA 14-J) (Sokolova et al. 2015).
Samples from Pyalkimporr Mountain, Lovozero Massif were used in the study of Sokolova et al 2015).
Isostructural with:
A Na-poor OH-bearing analogue of lomonosovite.


Betalomonosovite is a Group-IV TS-block mineral (Ti + Mg + Mn = 4 apfu). The crystal structure of betalomonosovite is an alternation of TS and I blocks of the composition Na4Ti4(Si2O7)2O2(OF) and Na2D4[PO3(OH)][PO2(OH)2], respectively (Sokolova et al 2015).

Classification of Betalomonosovite

Approved, 'Grandfathered' (first described prior to 1959)
Approval Year:
2015
9.BE.32

9 : SILICATES (Germanates)
B : Sorosilicates
E : Si2O7 groups, with additional anions; cations in octahedral [6] and greater coordination
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Type Occurrence of Betalomonosovite

General Appearance of Type Material:
Yellowish-brown plates to 5 X 4 X 0.3 cm
Geological Setting of Type Material:
Pegmatites of nepheline-syenites.

Physical Properties of Betalomonosovite

Colour:
Yellowish-brown
Density:
2.969 g/cm3 (Calculated)

Crystallography of Betalomonosovite

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 5.3331(7) Å, b = 14.172(2) Å, c = 14.509(2) Å
α = 14.509(2)°, β = 96.320(2)°, γ = 90.278(2)°
Ratio:
a:b:c = 0.376 : 1 : 1.024
Unit Cell Volume:
V 1060.7 ų
Comment:
space group P-1 to R = 6.64 %

Chemical Properties of Betalomonosovite

Formula:
Na64Ti4(Si2O7)2[PO3(OH)][PO2(OH)2]O2(OF)
All elements listed in formula:
Analytical Data:
Electron-microprobe analysis (Sokolova et al 2015)
Empirical Formula:
(Na5.39Ca0.36Mn0.04Mg0.015.80 (Ti2.77Nb0.48Mg0.29Fe 3+0.23Mn0.20Zr0.02Ta0.014(Si2.06O7)2[P1.98O5(OH)3]O2[O0.82F0.65(OH)0.532
Common Impurities:
Mn,Fe,Ca,Nb

Relationship of Betalomonosovite to other Species

Other Names for Betalomonosovite

Name in Other Languages:

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Betalomonosovite

Reference List:
Gerasimovskii V.I., Kazakova M.E. (1950) Doklady AN SSSR, 142(3), 670-673 (in Russ.)

Izvestiya Akademii Nauk SSSR (1971): 82.

Rastsvetaeva R.K., Sirota M.I., Belov N.V. (1975) Crystal structure of betalomonosovite. Kristallografia, 20(2), 259-264 (in Russ.).

Khalilov A.D. (1990) Refinement of crystal structure of betalomonosovite from the Lovozero alkaline massif. Mineralogicheskii Zhurnal, 12(5), 10-19 (in Russ.).

Ageeva O.A. (1999) Typomorphism of accessory lomonosovite from rocks of Khibiny massif. Zapiski RMO, №2, 99-104 (in Russ.).

Yakubovich, O.V., Karimova, O.V., Ageeva, O.A., Borutsky, B.Ye. (2014): Crystal structure of «betalomonosovite»: new data. Zapiski RMO, 143(6), 88-103

CNMNC Newsletter No. 24, April 2015 ; Mineralogical Magazine, 79, 247-251.

Sokolova, E., Hawthorne, F. C., Abdu, Y.A., Genovese, A. & Cámara, F. (2015): Reapproval of betalomonosovite as a valid mineral species: single-crystal X-ray diffraction, HRTEM, Raman and IR. Periodico di Mineralogia, ECMS2015, 157-158

Sokolova, E., Abdu, Y., Hawthorne, F.C., Genovese, A., Cámara, F., Khomyakov, A.P. (2015): From structure topology to chemical composition. XVIII. Titanium silicates: Revision of the crystal structure and chemical formula of betalomonosovite, a group-IV TS-block mineral from the Lovozero Alkaline Massif, Kola Peninsula, Russia. Canadian Mineralogist, 53, 401-428

Internet Links for Betalomonosovite

Localities for Betalomonosovite

(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Greenland
 
  • Kujalleq
    • Narsaq
Petersen, O.V. (2001): List of all minerals identified in the Ilímaussaq alkaline complex, South Greenland. Geology of Greenland Survey Bulletin. 190, 25-33
Russia
 
  • Northern Region
    • Murmanskaja Oblast'
      • Kola Peninsula
        • Khibiny Massif
          • Rasvumchorr Mt
[World of Stones 95:5-6, p64]
Pavel M. Kartashov data
        • Lovozero Massif
Gerasimovskii V.I., Kazakova M.E. (1950) Doklady AN SSSR, 142(3), 670-673 (in Rus.)
Sokolova, E., Abdu, Y., Hawthorne, F.C., Genovese, A., Cámara, F., Khomyakov, A.P. (2015): From structure topology to chemical composition. XVIII. Titanium silicates: Revision of the crystal structure and chemical formula of betalomonosovite, a group-IV TS-block mineral from the Lovozero Alkaline Massif, Kola Peninsula, Russia. Canadian Mineralogist, 53, 401-428
Pekov, I. V. (1998): Minerals first discovered on the territory of the former Soviet Union. Ocean Pictures Ltd., Moscow, 369 pp.; Pekov, I.V. (2000): Lovozero Massif. Moscow, Ocean Pictures Ltd, 480 pp
Mineral and/or Locality  
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