Eliseevite
A valid IMA mineral species
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About Eliseevite
Nikolai A. Eliseev
Formula:
LiNa1.5Ti2(H1.5Si4O12)O2 · 2H2O
Colour:
pale creamy to colorless
Lustre:
Vitreous
Hardness:
5
Specific Gravity:
2.68
Crystal System:
Monoclinic
Name:
In honor of Nikolai Aleksandrovich Eliseev (Dec 7 1897– June 24 1966), a remarkable Russian geologist and petrologist, Professor at Leningrad State University, in recognition of his contributions to the geology and petrology of metamorphic and alkaline complexes.
Closely (i.a., chemically) related to lintisite and punkaruaivite.
AM-4 family of natural titanosilicates (compare kukisvumite & manganokukisvumite).
AM-4 family of natural titanosilicates (compare kukisvumite & manganokukisvumite).
Unique Identifiers
Mindat ID:
40287
Long-form identifier:
mindat:1:1:40287:9
IMA Classification of Eliseevite
Classification of Eliseevite
9.DB.17
9 : SILICATES (Germanates)
D : Inosilicates
B : Inosilicates with 2-periodic single chains, Si2O6; Pyroxene-related minerals
9 : SILICATES (Germanates)
D : Inosilicates
B : Inosilicates with 2-periodic single chains, Si2O6; Pyroxene-related minerals
65.1.1.2
65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
1 : Single-Width Unbranched Chains, W=1 with chains P=2
65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
1 : Single-Width Unbranched Chains, W=1 with chains P=2
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Esv | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Eliseevite
Vitreous
Transparency:
Transparent
Colour:
Pale creamy to colorless
Streak:
White
Hardness:
5 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
{100}
{100}
Fracture:
Splintery
Density:
2.68(4) g/cm3 (Measured) 2.706 g/cm3 (Calculated)
Optical Data of Eliseevite
Type:
Biaxial (-)
RI values:
nα = 1.665(2) nβ = 1.712(2) nγ = 1.762(5)
2V:
Measured: 85° (5), Calculated: 89.3°
Max. Birefringence:
δ = 0.097
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
medium, r < v.
Chemistry of Eliseevite
Mindat Formula:
LiNa1.5Ti2(H1.5Si4O12)O2 · 2H2O
Element Weights:
Crystallography of Eliseevite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 27.48(1) Å, b = 8.669(4) Å, c = 5.246(2) Å
β = 90.782(8)°
β = 90.782(8)°
Ratio:
a:b:c = 3.17 : 1 : 0.605
Unit Cell V:
1,249.61 ų (Calculated from Unit Cell)
Z:
4
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 13.76 Å | (100) |
| 6.296 Å | (60) |
| 4.642 Å | (40) |
| 4.334 Å | (40) |
| 3.577 Å | (80) |
| 3.005 Å | (70) |
| 2.881 Å | (70) |
| 2.710 Å | (50) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 35 : Ultra-alkali and agpaitic igneous rocks |
Type Occurrence of Eliseevite
General Appearance of Type Material:
long-prismatic to fibrous crystals (up to 2 mm long) growing in voids of natrolitized sodalite
Place of Conservation of Type Material:
Type material is deposited in the collections of the Mineralogical Museum of St Petersburg State University, Russia, and the Geological and the Mineralogical Museum of the Geological Institute of the Kola Science Centre, Apatity,
Russia, catalogue number
Russia, catalogue number
Geological Setting of Type Material:
hydrothermally altered ussingite pegmatites within the layered complex of malignites, foyaites, and foidolites with lenses of poikilitic nepheline syenites. Formed as a result of alteration of murmanite.
Associated Minerals at Type Locality:
Synonyms of Eliseevite
Other Language Names for Eliseevite
Dutch:Eliseeviet
German:Eliseevit
Related Minerals - Strunz-mindat Grouping
| 9.DB.05 | Potassiccarpholite | K(Mn2+,Li)2Al4Si4O12(OH,F)8 |
| 9.DB.05 | Carpholite | Mn2+Al2(Si2O6)(OH)4 |
| 9.DB.05 | Vanadiocarpholite | Mn2+V3+Al(Si2O6)(OH)4 |
| 9.DB.05 | Magnesiocarpholite | MgAl2Si2O6(OH)4 |
| 9.DB.05 | Ferrocarpholite | Fe2+Al2Si2O6(OH)4 |
| 9.DB.05 | Balipholite | BaLiMg2Al3(Si2O6)2(OH)4 |
| 9.DB.10 | Lorenzenite | Na2Ti2(Si2O6)O3 |
| 9.DB.15 | Punkaruaivite | LiTi2(HSi4O12)(OH)2 · H2O |
| 9.DB.15 | Lintisite | LiNa3Ti2(Si2O6)2O2 · 2H2O |
| 9.DB.20 | Kukisvumite | Na6ZnTi4(Si8O24)O4 · 4H2O |
| 9.DB.20 | Manganokukisvumite | Na6MnTi4(Si8O24)O4 · 4H2O |
| 9.DB.25 | Vinogradovite | Na4Ti4(Si2O6)2[(Si,Al)4O10]O4 · (H2O,Na,K)3 |
| 9.DB.25 | Paravinogradovite | Na1-2(Ti,Fe3+)4(Si2O6)2(AlSi3O10)(OH)4 · H2O |
| 9.DB.30 | Nchwaningite | Mn2+2(SiO3)(OH)2 · H2O |
| 9.DB.40 | Shattuckite | Cu5(Si2O6)2(OH)2 |
| 9.DB.40 | 'UM2005-31-SiO:CuH' | Cu11(SiO4)(OH)18 · 9H2O (?) |
| 9.DB.45 | Aerinite | (Ca5.1Na0.5)(Fe3+,Al,Fe2+,Mg)4(Al,Mg)6[HSi12O36(OH)12][(CO3)1.2(H2O)12] |
| 9.DB.50 | Capranicaite | KCaNaAl4B4Si2O18 |
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.
Internet Links for Eliseevite
mindat.org URL:
https://www.mindat.org/min-40287.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Eliseevite
Reference List:
Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2010) New minerals and nomenclature modifications approved in 2010, CNMNC Newsletter No 5. Mineralogical Magazine, 74 (5) 859-862 doi:10.1180/s0026461x00056887
Yakovenchuk, V. N., Ivanyuk, G. Y., Krivovichev, S. V., Pakhomovsky, Y. A., Selivanova, E. A., Korchak, J. A., Men'shikov, Y. P., Drogobuzhskaya, S. V., Zalkind, O. A. (2011) Eliseevite, Na1.5Li[Ti2Si4O12.5(OH)1.5] · 2H2O, a new microporous titanosilicate from the Lovozero alkaline massif (Kola Peninsula, Russia) American Mineralogist, 96 (10) 1624-1629 doi:10.2138/am.2011.3726
Localities for Eliseevite
Showing 3 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Russia (TL) | |
| Williams et al. (2010) +1 other reference |
| Yakovenchuk et al. (2011) | |
Spain | |
| Dill et al. (2023) |
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Alluaiv Mountain, Lovozersky District, Murmansk Oblast, Russia