Lobanovite
A valid IMA mineral species
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About Lobanovite
Formula:
K2Na(Fe2+4Mg2Na)Ti2(Si4O12)2O2(OH)4
Colour:
Straw yellow to orange
Lustre:
Vitreous
Hardness:
3
Specific Gravity:
3.161 (Calculated)
Crystal System:
Monoclinic
Member of:
Name:
First described in 1959 as "unusual light yellow and greenish fibrous astrophyllite" by E.I. Semenov from Kukisvumchorr Mt, Khibiny, Kola, Russia (Pekov 1998). Named magnesium astrophyllite for its relationship to astrophyllite and changed in 2008 to magnesioastrophyllite. It was formally described as a new mineral in 2017 (Sokolova et al.). The name lobanovite honors Dr. Constantin V. Lobanov, a Russian geologist working in the Kola Peninsula.
Unique combination of elements.
Note:
Originally named and published as "magnesium astrophyllite" and "magnesioastrophyllite". Validated by IMA in 2015 under the name lobanovite (IMA 15-B).
Peng & Ma (1963) established its monoclinic symmetry.
The structure is based on HOH blocks comprising one cp octahedral and two heteropolyhedral sheets; the HOH blocks repeat along [001]. The O sheet is built of M(1-4) octahedra; the H sheet is formed by T4O12 astrophyllite ribbons having common vertices with D polyhedra dominated by VTi. K and Na atoms are in the interstitial A and B sites.
Note:
Originally named and published as "magnesium astrophyllite" and "magnesioastrophyllite". Validated by IMA in 2015 under the name lobanovite (IMA 15-B).
Peng & Ma (1963) established its monoclinic symmetry.
The structure is based on HOH blocks comprising one cp octahedral and two heteropolyhedral sheets; the HOH blocks repeat along [001]. The O sheet is built of M(1-4) octahedra; the H sheet is formed by T4O12 astrophyllite ribbons having common vertices with D polyhedra dominated by VTi. K and Na atoms are in the interstitial A and B sites.
Unique Identifiers
Mindat ID:
2487
Long-form identifier:
mindat:1:1:2487:3
GUID
(UUID V4):
(UUID V4):
21407191-5462-469d-b8a3-e8025bd7d297
IMA Classification of Lobanovite
Approved
Approval year:
2015
First published:
1963
Approval history:
IMA 15-B: "magnesioastrophyllite" is validated under the name lobanovite (Hålenius et al. 2015).
Classification of Lobanovite
9.DC.05
9 : SILICATES (Germanates)
D : Inosilicates
C : Inosilicates with branched 2-periodic single chains; Si2O6 + 2SiO3 Si4O12
9 : SILICATES (Germanates)
D : Inosilicates
C : Inosilicates with branched 2-periodic single chains; Si2O6 + 2SiO3 Si4O12
69.1.1.7
69 : INOSILICATES Chains with Side Branches or Loops
1 : Chains with Side Branches or Loops with (P=2, and N=4, 2 branches)
69 : INOSILICATES Chains with Side Branches or Loops
1 : Chains with Side Branches or Loops with (P=2, and N=4, 2 branches)
14.9.31
14 : Silicates not Containing Aluminum
9 : Silicates of Ti
14 : Silicates not Containing Aluminum
9 : Silicates of Ti
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Symbol | Source | Reference |
---|---|---|
Lbv | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Lbv | Warr (2020) | Warr, L.N. (2020) Recommended abbreviations for the names of clay minerals and associated phases. Clay Minerals, 55, 261–264 doi:10.1180/clm.2020.30 |
Physical Properties of Lobanovite
Vitreous
Colour:
Straw yellow to orange
Streak:
White to yellowish-white.
Hardness:
3 on Mohs scale
Cleavage:
Perfect
Perfect cleavage parallel to (001) and moderate cleavage parallel to (010).
Perfect cleavage parallel to (001) and moderate cleavage parallel to (010).
Parting:
None observed.
Fracture:
None observed
Density:
3.161 g/cm3 (Calculated)
Comment:
Calculated from the empirical formula.
Optical Data of Lobanovite
Type:
Biaxial (-)
RI values:
nα = 1.658 nβ = 1.687 nγ = 1.710
2V:
Measured: 81.5° to 83°, Calculated: 82°
Max Birefringence:
δ = 0.052
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r < v, strong.
Optical Extinction:
Y = b; Z ∧ a = –5 to –6°.
Pleochroism:
Visible
Comments:
X = bright yellow; Y = pale yellowish grey; Z = grey.
Comments:
Absorption: Z < Y < X.
Chemistry of Lobanovite
Mindat Formula:
K2Na(Fe2+4Mg2Na)Ti2(Si4O12)2O2(OH)4
Common Impurities:
Mn,F,Ca,(Nb,Al,Ba)
Crystallography of Lobanovite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 5.3327(2) Å, b = 23.1535(9) Å, c = 10.3775(4) Å
β = 99.615(1)°
β = 99.615(1)°
Ratio:
a:b:c = 0.23 : 1 : 0.448
Unit Cell V:
1263.3 ų
Z:
2
Morphology:
Elongated blades.
Twinning:
None observed.
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0009902 | Lobanovite | Shi N, Ma Z, Li G, Yamnova M A, Pushcharovsky D Y (1998) Structure refinement of monoclinic astrophyllite Acta Crystallographica B54 109-114 | 1998 | Khibina alkaline massif, Russia | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
3.38 100 Å | (003) |
2.548 90 Å | (063) |
10.1 80 Å | (001) |
3.80 60 Å | (042 131) |
3.079 50 Å | (132 062) |
2.763 90 Å | (⎯171) |
Comments:
The data are given in Sokolova et al. (2017) but are from the X-ray Laboratory, Hubei Geologic College (1974).
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 Lobanovite
Co-Type Localities:
General Appearance of Type Material:
Elongated bladed crystals up to 0.04 mm wide and 0.2 mm long.
Geological Setting of Type Material:
Pegmatitic cavities.
Associated Minerals at Type Locality:
Synonyms of Lobanovite
Relationship of Lobanovite to other Species
Member of:
Other Members of this group:
Devitoite | [Ba6(PO4)2(CO3)][Fe2+7(OH)4Fe3+2O2(Si4O12)2] | Tric. 1 : P1 |
Sveinbergeite | Ca(Fe2+6Fe3+)Ti2(Si4O12)2O2(OH)5(H2O)4 | Tric. 1 : P1 |
Common Associates
Associated Minerals Based on Photo Data:
6 photos of Lobanovite associated with Aegirine | NaFe3+Si2O6 |
5 photos of Lobanovite associated with Lamprophyllite | (Na,Mn2+)3(Sr,Na)2(Ti,Fe3+)3(Si2O7)2O2(OH,O,F)2 |
5 photos of Lobanovite associated with Nepheline | Na3K(Al4Si4O16) |
3 photos of Lobanovite associated with Microcline | K(AlSi3O8) |
2 photos of Lobanovite associated with Natisite | Na2Ti(SiO4)O |
1 photo of Lobanovite associated with Eudialyte | Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2 |
Related Minerals - Strunz-mindat Grouping
9.DC. | Bulgakite | Li2(Ca,Na)Fe2+7Ti2(Si4O12)2O2(OH)4(F,O)(H2O)2 |
9.DC.05 | Astrophyllite | K2NaFe2+7Ti2Si8O26(OH)4F |
9.DC.05 | Hydroastrophyllite | (H3O,K,Ca)3(Fe,Mn)5-65Ti2Si8(O,OH)31 |
9.DC.05 | Kupletskite | (K,Na)3(Mn,Fe)7Ti2Si8O26(OH)4F |
9.DC.05 | Niobophyllite | (K,Na)3(Fe,Mn)6(Nb,Ti)2Si8(O,OH,F)31 |
9.DC.05 | Zircophyllite | K2NaFe2+7Zr2(Si4O12)2O2(OH)4F |
9.DC.05 | Kupletskite-(Cs) | Cs2NaMn2+7Ti2(Si4O12)2O2(OH)4F |
9.DC.05 | Niobokupletskite | K2NaMn2+7(Nb,Ti)(Si4O12)2O2(OH)4(O,F) |
9.DC.05 | Nalivkinite | Li2Na(Fe2+,Mn2+)7Ti2Si8O26(OH)4F |
9.DC.05 | Devitoite | [Ba6(PO4)2(CO3)][Fe2+7(OH)4Fe3+2O2(Si4O12)2] |
9.DC.05 | Sveinbergeite | Ca(Fe2+6Fe3+)Ti2(Si4O12)2O2(OH)5(H2O)4 |
9.DC.05 | Tarbagataite | (K◻)Ca(Fe2+,Mn)7Ti2(Si4O12)2O2(OH)5 |
9.DC.05 | Heyerdahlite | Na3Mn7Ti2(Si4O12)2O2(OH)4F(H2O)2 |
9.DC.05 | Laverovite | K2NaMn7Zr2(Si4O12)2O2(OH)4F |
Other Information
Thermal Behaviour:
The DTA curve shows endothermic peaks at 835°C (strong, escape of OH) and 900°C (weak).
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 Lobanovite
mindat.org URL:
https://www.mindat.org/min-2487.html
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References for Lobanovite
Reference List:
Burke, Ernst A. J. (2008) Tidying up mineral names: an IMA-CNMNC scheme for suffixes, hyphens and diacritical marks. The Mineralogical Record, 39 (2) 131-135
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2015) New minerals and nomenclature modifications approved in 2015, CNMNC Newsletter 26. Mineralogical Magazine, 79 (4) 941-947 doi:10.1180/minmag.2015.079.4.05
Sokolova, Elena, Cámara, Fernando, Hawthorne, Frank C., Semenov, Evgeny I., Ciriotti, Marco E. (2017) Lobanovite, K2Na(Fe42+Mg2Na)Ti2(Si4O12)2O2(OH)4, a new mineral of the astrophyllite supergroup and its relation to magnesioastrophyllite. Mineralogical Magazine, 81 (1) 175-181 doi:10.1180/minmag.2016.080.088
Localities for Lobanovite
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).
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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Russia | |
| [World of Stones 95:5-6 +1 other reference |
| Pekov (1998) |
Pekov (1998) | |
Takai et al. (2011) | |
| Pekov I.V. et al. (2010) |
| [Mandarino |
| Pekov (1998) +1 other reference |
... |
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Yukspor Mt, Khibiny Massif, Murmansk Oblast, Russia