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Laptevite-(Ce)

A valid IMA mineral species
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06236680017272009844881.jpg
Laptevite-(Ce)

Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan
02257810017272009869656.jpg
Laptevite-(Ce)

Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan
04145370017272276027657.jpg
Laptevite-(Ce), etc.

Gere-Su river, Matcha massif, Zeravshan range, Batken Region, Kyrgyzstan
00214980017272472159065.jpg
Laptevite-(Ce)

Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan
06279160017272472151627.jpg
Laptevite-(Ce)

Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan
05641920017272472163151.jpg
Laptevite-(Ce), etc.

Gere-Su river, Matcha massif, Zeravshan range, Batken Region, Kyrgyzstan
06236680017272009844881.jpg
Laptevite-(Ce)

Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan
02257810017272009869656.jpg
Laptevite-(Ce)

Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan
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About Laptevite-(Ce)Hide

Formula:
Ca6(Fe2+,Mn2+)Y3REE7(SiO4)3(PO4)(B3Si3O18)(BO3)F11
Colour:
Dark brown
Lustre:
Vitreous, Greasy
Hardness:
4½ - 5
Specific Gravity:
4.61
Crystal System:
Trigonal
Member of:
Vicanite Group
Name:
Named in honor of Tatyana Mikhailovna Lapteva (Татьяна Михайловна Лаптева) (1928-2011), a Russian geologist and petrologist who worked on the geology of Central Asia and the REE cerium.
Structurally related to the Vicanite Group (e.g. Okanoganite-(Y)).



Unique IdentifiersHide

Mindat ID:
42866
Long-form identifier:
mindat:1:1:42866:4

IMA Classification of Laptevite-(Ce)Hide

Classification of Laptevite-(Ce)Hide

Strunz-mindat (2025):
9.AJ.35

9 : SILICATES (Germanates)
A : Nesosilicates
J : Nesosilicates with BO3 triangles and/or B[4], Be[4] tetrahedra, cornersharing with SiO4

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

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

Physical Properties of Laptevite-(Ce)Hide

Lustre:
Vitreous, Greasy
Transparency:
Transparent
Colour:
Dark brown
Hardness:
4½ - 5 on Mohs scale
Hardness:
VHN50=453 kg/mm2 - Vickers
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
4.61(2) g/cm3 (Measured)    4.619 g/cm3 (Calculated)

Optical Data of Laptevite-(Ce)Hide

Type:
Uniaxial (-)
RI values:
nω = 1.741(3) nε = 1.720(3)
Max Birefringence:
δ = 0.021
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High

Chemistry of Laptevite-(Ce)Hide

Mindat Formula:
Ca6(Fe2+,Mn2+)Y3REE7(SiO4)3(PO4)(B3Si3O18)(BO3)F11
Elements listed:
B, Ca, F, Fe, Mn, O, P, Si, Y - search for minerals with similar chemistry

Crystallography of Laptevite-(Ce)Hide

Crystal System:
Trigonal
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
R3m
Setting:
R3m
Cell Parameters:
a = 10.804(2) Å, c = 27.726(6) Å
Ratio:
a:c = 1 : 2.566
Unit Cell V:
2802.6 ų
Z:
3

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.41 Å(29)
3.13 Å(26)
3.03 Å(100)
2.982 Å(85)
2.954 Å(60)
2.689 Å(40)
1.797 Å(31)
1.770 Å(21)

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 Laptevite-(Ce)Hide

Type Locality:
ⓘ Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan
General Appearance of Type Material:
anhedral grains to 8mm
Place of Conservation of Type Material:
Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia, registration number 4195/1
Geological Setting of Type Material:
hydrothermal mineral
Associated Minerals at Type Locality:
AegirineBafertisiteCalciteFluoriteMicrocline
Pyrochlore GroupQuartzStillwellite-(Ce)
Reference:
Agakhanov, A. A., Pautov, L. A., Uvarova, Y. A., Sokolova, E. V., Hawthorne, F. C., Karpenko, V. Y. (2013) Laptevite-(Ce) NaFe2+(REE7Ca5Y3)(SiO4)4(Si3B2PO18)(BO3)F11 - a new vicanite-group mineral from Darai-Pioz alkaline massif. New Data on Minerals, 48. Fersman Mineralogical Museum. 5-11

Synonyms of Laptevite-(Ce)Hide

Other Language Names for Laptevite-(Ce)Hide

Relationship of Laptevite-(Ce) to other SpeciesHide

Member of:
Vicanite Group
Other Members of Vicanite Group:
Arrheniusite-(Ce)CaMg[(Ce7Y3)Ca5](SiO4)4(Si2B3AsO18)(BO3)F11Trig. 3m : R3m
Hundholmenite-(Y)(Y,REE,Ca,Na)15(Al,Fe3+)(CaxAs3+1-x)(Si,As5+)Si6B3(O,F)48Trig. 3m : R3m
Okanoganite-(Y)(Na,Ca)3(Y,Ce)12Si6B2O27F14Trig. 3m : R3m
Proshchenkoite-(Y)Ca(Y,REE,Ca,Na,Mn)15Fe2+(P,Si)Si6B3O34F14Trig. 3m : R3m
Vicanite-(Ce)(Ca,Ce,La,Th)15As5+(As3+0.5,Na0.5)Fe3+Si6B4O40F7Trig. 3m : R3m

Common AssociatesHide

Associated Minerals Based on Photo Data:
5 photos of Laptevite-(Ce) associated with AstrophylliteK2NaFe2+7Ti2[Si4O12]2O2(OH)4F
5 photos of Laptevite-(Ce) associated with AegirineNaFe3+Si2O6
4 photos of Laptevite-(Ce) associated with BafertisiteBa2Fe2+4Ti2(Si2O7)2O2(OH)2F2
3 photos of Laptevite-(Ce) associated with QuartzSiO2

Related Minerals - Strunz-mindat GroupingHide

9.AJ.Hingganite-(Nd)Nd2◻Be2Si2O8(OH)2Mon. 2/m : P21/b
9.AJ.Arrheniusite-(Ce)CaMg[(Ce7Y3)Ca5](SiO4)4(Si2B3AsO18)(BO3)F11Trig. 3m : R3m
9.AJ.05Ominelite(Fe2+,Mg)(Al,Fe3+)3(SiO4)(BO3)O2Orth. mmm (2/m 2/m 2/m)
9.AJ.05Grandidierite(Mg,Fe2+)(Al,Fe3+)3(SiO4)(BO3)O2Orth. mmm (2/m 2/m 2/m)
9.AJ.10DumortieriteAl(Al2O)(Al2O)2(SiO4)3(BO3)Orth. mmm (2/m 2/m 2/m)
9.AJ.10Nioboholtite(Nb0.6◻0.4)Al6BSi3O18Orth. mmm (2/m 2/m 2/m) : Pbcm
9.AJ.10Titanoholtite(Ti0.75◻0.25)Al6BSi3O18Orth. mmm (2/m 2/m 2/m) : Pbcm
9.AJ.10Holtite(Ta0.6◻0.4)Al6BSi3O18(O,OH)2.25Orth. mmm (2/m 2/m 2/m) : Pnma
9.AJ.10MagnesiodumortieriteMg(Al2OH)(Al2O)2(SiO4)3(BO3)Orth. mmm (2/m 2/m 2/m)
9.AJ.15GarrelsiteBa3NaSi2B7O16(OH)4Mon. 2/m : B2/b
9.AJ.20Muromontitenear Be2FeY2Si3O12
9.AJ.20Gadolinite-(Nd)Nd2Fe2+Be2O2(SiO4)2Mon. 2/m : P21/b
9.AJ.20DatoliteCaB(SiO4)(OH)Mon. 2/m : P21/b
9.AJ.20Melanocerite-(Ce)(Ce,Ca)5(SiO4,BO4)3(OH,O)Hex.
9.AJ.20Gadolinite-(Ce)(Ce,La,Nd,Y)2Fe2+Be2Si2O10Mon. 2/m
9.AJ.20Gadolinite-(Y)Y2Fe2+Be2Si2O10Mon. 2/m : P21/b
9.AJ.20Unnamed (OH-analogue of Gadolinite-(Y))(Y,Ca)2(Fe,◻)Be2Si2O8(OH,O)2Mon. 2/m
9.AJ.20Hingganite-(Ce)(Ce,REE)2(◻,Fe2+)Be2[SiO4]2(OH)2Mon. 2/m : P21/b
9.AJ.20Hingganite-(Y)(Y,REE,Ca)2(◻,Fe2+)Be2[SiO4]2(OH)2Mon. 2/m : P21/b
9.AJ.20Hingganite-(Yb)(Yb,Y,REE)2◻Be2[SiO4]2(OH)2Mon. 2/m : P21/b
9.AJ.20HomiliteCa2(Fe2+,Mg)B2Si2O10Mon. 2/m : P21/b
9.AJ.20Minasgeraisite-(Y)(Ca2Y2)◻2(Be2B2)[SiO4]4(OH)4Tric. 1 : P1
9.AJ.20Calcybeborosilite-(Y)(Y,Ca)2(◻,Fe2+)(B,Be)2[SiO4]2(OH,O)2Mon.
9.AJ.25Stillwellite-(La)LaBSiO5Trig. 3 2 : P32 2 1
9.AJ.25Stillwellite-(Ce)(Ce,La,Ca)BSiO5Trig. 3 : P31
9.AJ.30Cappelenite-(Y)Ba(Y,Ce)6Si3B6O24F2Trig. 3 : P3
9.AJ.35Proshchenkoite-(Y)Ca(Y,REE,Ca,Na,Mn)15Fe2+(P,Si)Si6B3O34F14Trig. 3m : R3m
9.AJ.35Okanoganite-(Y)(Na,Ca)3(Y,Ce)12Si6B2O27F14Trig. 3m : R3m
9.AJ.35Hundholmenite-(Y)(Y,REE,Ca,Na)15(Al,Fe3+)(CaxAs3+1-x)(Si,As5+)Si6B3(O,F)48Trig. 3m : R3m
9.AJ.35Vicanite-(Ce)(Ca,Ce,La,Th)15As5+(As3+0.5,Na0.5)Fe3+Si6B4O40F7Trig. 3m : R3m
9.AJ.40JadariteLiNaSiB3O7(OH)Mon. 2/m

Other InformationHide

IR Spectrum:
Absorption bands at 1623, 1437, 1300, 945, 930, 877sh, 758, 637, 570, 531 cm-1.
Notes:
Water-insoluble, dissolves poorly in HCl (1:1) at room temperature
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 Laptevite-(Ce)Hide

References for Laptevite-(Ce)Hide

Localities for Laptevite-(Ce)Hide

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.
Kyrgyzstan
 
  • Batken Region
    • Zeravshan range
      • Matcha massif
Atali A.Agakhanov and Leonid A.Pautov ...
Tajikistan (TL)
 
  • Districts of Republican Subordination
Agakhanov et al. (2013) +1 other reference
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