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Lobanovite

A valid IMA mineral species
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About LobanoviteHide

00947970014947161884611.jpg
Constantin Valentinovich Lobanov
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
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.



Unique IdentifiersHide

Mindat ID:
2487
Long-form identifier:
mindat:1:1:2487:3
GUID
(UUID V4):
21407191-5462-469d-b8a3-e8025bd7d297

IMA Classification of LobanoviteHide

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 LobanoviteHide

9.DC.05

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)
14.9.31

14 : Silicates not Containing Aluminum
9 : Silicates of Ti

Mineral SymbolsHide

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.

SymbolSourceReference
LbvIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
LbvWarr (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 LobanoviteHide

Vitreous
Colour:
Straw yellow to orange
Streak:
White to yellowish-white.
Hardness:
Cleavage:
Perfect
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 LobanoviteHide

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.
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 LobanoviteHide

Mindat Formula:
K2Na(Fe2+4Mg2Na)Ti2(Si4O12)2O2(OH)4
Common Impurities:
Mn,F,Ca,(Nb,Al,Ba)

Crystallography of LobanoviteHide

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)°
Ratio:
a:b:c = 0.23 : 1 : 0.448
Unit Cell V:
1263.3 ų
Z:
2
Morphology:
Elongated blades.
Twinning:
None observed.

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0009902LobanoviteShi N, Ma Z, Li G, Yamnova M A, Pushcharovsky D Y (1998) Structure refinement of monoclinic astrophyllite Acta Crystallographica B54 109-1141998Khibina alkaline massif, Russia0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
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 EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 4b: Highly evolved igneous rocks>3.0
35 : Ultra-alkali and agpaitic igneous rocks

Type Occurrence of LobanoviteHide

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 LobanoviteHide

Relationship of Lobanovite to other SpeciesHide

Other Members of this group:
Devitoite[Ba6(PO4)2(CO3)][Fe2+7(OH)4Fe3+2O2(Si4O12)2]Tric. 1 : P1
SveinbergeiteCa(Fe2+6Fe3+)Ti2(Si4O12)2O2(OH)5(H2O)4Tric. 1 : P1

Common AssociatesHide

Associated Minerals Based on Photo Data:
6 photos of Lobanovite associated with AegirineNaFe3+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 NephelineNa3K(Al4Si4O16)
3 photos of Lobanovite associated with MicroclineK(AlSi3O8)
2 photos of Lobanovite associated with NatisiteNa2Ti(SiO4)O
1 photo of Lobanovite associated with EudialyteNa15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2

Related Minerals - Strunz-mindat GroupingHide

9.DC.BulgakiteLi2(Ca,Na)Fe2+7Ti2(Si4O12)2O2(OH)4(F,O)(H2O)2Tric. 1 : P1
9.DC.05AstrophylliteK2NaFe2+7Ti2Si8O26(OH)4FTric. 1 : P1
9.DC.05Hydroastrophyllite(H3O,K,Ca)3(Fe,Mn)5-65Ti2Si8(O,OH)31Tric.
9.DC.05Kupletskite(K,Na)3(Mn,Fe)7Ti2Si8O26(OH)4FTric.
9.DC.05Niobophyllite(K,Na)3(Fe,Mn)6(Nb,Ti)2Si8(O,OH,F)31Tric.
9.DC.05ZircophylliteK2NaFe2+7Zr2(Si4O12)2O2(OH)4FTric.
9.DC.05Kupletskite-(Cs)Cs2NaMn2+7Ti2(Si4O12)2O2(OH)4FTric. 1 : P1
9.DC.05NiobokupletskiteK2NaMn2+7(Nb,Ti)(Si4O12)2O2(OH)4(O,F)Tric. 1 : P1
9.DC.05NalivkiniteLi2Na(Fe2+,Mn2+)7Ti2Si8O26(OH)4FTric. 1 : P1
9.DC.05Devitoite[Ba6(PO4)2(CO3)][Fe2+7(OH)4Fe3+2O2(Si4O12)2]Tric. 1 : P1
9.DC.05SveinbergeiteCa(Fe2+6Fe3+)Ti2(Si4O12)2O2(OH)5(H2O)4Tric. 1 : P1
9.DC.05Tarbagataite(K◻)Ca(Fe2+,Mn)7Ti2(Si4O12)2O2(OH)5 Tric. 1 : P1
9.DC.05HeyerdahliteNa3Mn7Ti2(Si4O12)2O2(OH)4F(H2O)2Tric. 1 : P1
9.DC.05Laverovite K2NaMn7Zr2(Si4O12)2O2(OH)4FTric. 1 : P1

Other InformationHide

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 LobanoviteHide

References for LobanoviteHide

Reference List:

Localities for LobanoviteHide

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 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.
Russia
 
  • Murmansk Oblast
    • Khibiny Massif
      • Koashva Mt
[World of Stones 95:5-6 +1 other reference
Pekov (1998)
Pekov (1998)
Takai et al. (2011)
        • Rasvumchorr Mine
Pekov I.V. et al. (2010)
      • The Carbonatite Stock in the vicinity of Tul'ilukht Bay
[Mandarino
Pekov (1998) +1 other reference
...
 
矿物 and/or 产地  
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