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Selivanovaite

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Formula:
(Na,Ca)3(Ti,Fe)5[Si4O18(OH)3]·7H2O
Colour:
Dark-orange
Lustre:
Vitreous
Hardness:
3
Specific Gravity:
3.15
Crystal System:
Triclinic
Name:
Named in honour of Dr. Ekaterina A. Selivanova (b. 1967), from the Kola Science Centre of the Russian Academy of Sciences, for her contribution to the mineralogy of alkaline complexes.
New structure type. Chemically similar minerals include ivanyukite-Na, ivanyukite-Na-C, ivanyukite-Na-T, penkvilksite, and to some extent also tiettaite.

Found in drill cores from 100-130 m below the ground, coming from the Lovozero Eudialyte Complex.

The crystal structure of selivanovaite is closely related to those of murmanite-group minerals and consists of the HOH-layers with the composition [N2M5Si4O18(OH)3] (M = Ti, Nb, Fe and Mn, N = Na, K, Ca, Mn, Mg and Zr) connected by additional N-octahedra with H2O molecules between them.


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Classification of SelivanovaiteHide

Approved
Approval Year:
2015
First Published:
2018

Physical Properties of SelivanovaiteHide

Vitreous
Colour:
Dark-orange
Streak:
Brownish-white
Hardness:
Cleavage:
Perfect
perfect on {0 0 1} and weak on {1 1 0}
Fracture:
Step-Like
Density:
3.15 g/cm3 (Measured)    3.34 g/cm3 (Calculated)

Optical Data of SelivanovaiteHide

Type:
Biaxial (+)
RI values:
nα = 1.790(1) nβ = 1.810(1) nγ = 1.870(1)
2V:
Measured: 40° (5), Calculated: 57.3°
Max Birefringence:
δ = 0.080
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
Not observed
Pleochroism:
Non-pleochroic
Comments:
Not observed
Comments:
Z^c = 5–10°.

Chemical Properties of SelivanovaiteHide

Formula:
(Na,Ca)3(Ti,Fe)5[Si4O18(OH)3]·7H2O
Idealised Formula:
NaTi3(Ti, Na, Fe, Mn)4[(Si2O7)2O4(OH,H2O)4]·nH2O (from type description),

Crystallography of SelivanovaiteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 8.673(5) Å, b = 8.694(3) Å, c = 12.217(1) Å
α = 92.70(5)°, β = 108.46(7)°, γ = 105.40(4)°
Ratio:
a:b:c = 0.998 : 1 : 1.405
Unit Cell V:
833 ų
Z:
2
Morphology:
Platy metacrysts (up to 8 mm in diameter)
Comment:
From single-crystal diffraction data (type description)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
11.43(100)
6.37(25)
5.73(15)
4.208(16)
3.108(35)
3.043(20)
2.596(17)
2.496(14)

Occurrences of SelivanovaiteHide

Paragenetic Mode(s):

Type Occurrence of SelivanovaiteHide

General Appearance of Type Material:
Platy metacrysts (up to 8 mm in diameter) with numerous poikilitic inclusions of aegirine and magnesioarfvedsonite
Place of Conservation of Type Material:
collections of the (1) Mineralogical Museum, St. Petersburg State University, St. Petersburg, Russia (catalogue no. 19649) and (2) the Geological and the Mineralogical Museum, Geological Institute, Kola Science Centre, Apatity, Russia (catalogue no. 7538)
Empirical Formula of Type Material:
(Na1.65Mn0.35Ca0.28Zr0.18Mg0.14K0.132.73(Ti3.67Fe3+0.78Nb0.47Al0.014.93[Si4O19.72]8.87H2O
Chemical Analysis of Type Material:
Na2O5.45 %
MgO0.59 %
Al2O30.04 %
SiO225.55 %
K2O0.63 %
CaO1.68 %
TiO231.17 %
MnO2.64 %
FeO6.63 %
ZrO22.31 %
Nb2O56.69 %
H2O17.0 %
Total:100.38 %
Geological Setting of Type Material:
From a medium-grained trachytoid eudialyte-rich malignite of the Lovozero complex
Associated Minerals at Type Locality:
Reference:
Pakhomovsky, Y.A., Panikorovskii, T.L., Yakovenchuk, V.N., Ivanyuk, G.Y., Mikhailova, J.A., Krivovichev, S.V., Bocharov, V.N. & Kalashnikov, A.O. (2018) Selivanovaite, NaTi3(Ti,Na,Fe,Mn)4[(Si2O7)2O4(OH,H2O)4]·nH2O, a new rock-forming mineral from the eudialyte-rich malignite of the Lovozero alkaline massif (Kola Peninsula, Russia). European Journal of Mineralogy. 30 (3): 515-523

Synonyms of SelivanovaiteHide

Relationship of Selivanovaite to other SpeciesHide

Other Members of this group:
MurmaniteNa2Ti2(Si2O7)O2 · 2H2OTric.

Other InformationHide

Notes:
Dissolves slowly in cold 10% HCl.
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 SelivanovaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Pakhomovsky, Y.A., Panikirovskii, T.L., Yakovenchuk, V.N., Ivanyuk, G.Y., Mikhailova, J.A., Krivovichev, S.V., Bocharov, V.N. (2016): Selivanovaite, IMA 2015-126. CNMNC Newsletter No. 31, June 2016, page 693; Mineralogical Magazine: 80: 691–697
Pakhomovsky, Y.A., Panikorovskii, T.L., Yakovenchuk, V.N., Ivanyuk, G.Y., Mikhailova, J.A., Krivovichev, S.V., Bocharov, V.N. & Kalashnikov, A.O. (2018) Selivanovaite, NaTi3(Ti,Na,Fe,Mn)4[(Si2O7)2O4(OH,H2O)4]·nH2O, a new rock-forming mineral from the eudialyte-rich malignite of the Lovozero alkaline massif (Kola Peninsula, Russia). European Journal of Mineralogy. 30 (3): 515-523. doi:10.1127/ejm/2018/0030-2745

Internet Links for SelivanovaiteHide

Localities for SelivanovaiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Russia (TL)
 
  • Northern Region
    • Murmanskaya Oblast'
      • Lovozero Massif
Pakhomovsky, Y.A., Panikirovskii, T.L., Yakovenchuk, V.N., Ivanyuk, G.Y., Mikhailova, J.A., Krivovichev, S.V., Bocharov, V.N. (2016): Selivanovaite, IMA 2015-126. CNMNC Newsletter No. 31, June 2016, page 693; Mineralogical Magazine: 80: 691–697; Pakhomovsky, Y.A., Panikorovskii, T.L., Yakovenchuk, V.N., Ivanyuk, G.Y., Mikhailova, J.A., Krivovichev, S.V., Bocharov, V.N. & Kalashnikov, A.O. (2018) Selivanovaite, NaTi3(Ti,Na,Fe,Mn)4[(Si2O7)2O4(OH,H2O)4]·nH2O, a new rock-forming mineral from the eudialyte-rich malignite of the Lovozero alkaline massif (Kola Peninsula, Russia). European Journal of Mineralogy. 30 (3): 515-523
Mineral and/or Locality  
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