Laptevite-(Ce)
A valid IMA mineral species
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About Laptevite-(Ce)
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:
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.
Isostructural with:
Unique Identifiers
Mindat ID:
42866
Long-form identifier:
mindat:1:1:42866:4
IMA Classification of Laptevite-(Ce)
Approved
IMA Formula:
NaFe2+(REE7Ca5Y3)(SiO4)4(Si3B2PO18)(BO3)F11
Approval year:
2011
First published:
2013
Type description reference:
Classification of Laptevite-(Ce)
9.AJ.35
9 : SILICATES (Germanates)
A : Nesosilicates
J : Nesosilicates with BO3 triangles and/or B[4], Be[4] tetrahedra, cornersharing with SiO4
9 : SILICATES (Germanates)
A : Nesosilicates
J : Nesosilicates with BO3 triangles and/or B[4], Be[4] tetrahedra, cornersharing with SiO4
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 |
|---|---|---|
| Lpt-Ce | 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 Laptevite-(Ce)
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)
Type:
Uniaxial (-)
RI values:
nω = 1.741(3) nε = 1.720(3)
Max. Birefringence:
δ = 0.021
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.
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.
Surface Relief:
Moderate
Chemistry of Laptevite-(Ce)
Mindat Formula:
Ca6(Fe2+,Mn2+)Y3REE7(SiO4)3(PO4)(B3Si3O18)(BO3)F11
Element Weights:
Crystallography of Laptevite-(Ce)
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 Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 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) |
Reference:
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 Laptevite-(Ce)
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:
Reference:
Synonyms of Laptevite-(Ce)
Other Language Names for Laptevite-(Ce)
Relationship of Laptevite-(Ce) to other Species
Member of:
Other Members of Vicanite Group:
| Arrheniusite-(Ce) | CaMg[(Ce7Y3)Ca5](SiO4)4(Si2B3AsO18)(BO3)F11 | Trig. 3m : R3m |
| Hundholmenite-(Y) | (Y,REE,Ca,Na)15(Al,Fe3+)(CaxAs3+1-x)(Si,As5+)Si6B3(O,F)48 | Trig. 3m : R3m |
| Okanoganite-(Y) | (Na,Ca)3(Y,Ce)12Si6B2O27F14 | Trig. 3m : R3m |
| Proshchenkoite-(Y) | Ca(Y,REE,Ca,Na,Mn)15Fe2+(P,Si)Si6B3O34F14 | Trig. 3m : R3m |
| Vicanite-(Ce) | (Ca,Ce,La,Th)15As5+(As3+0.5,Na0.5)Fe3+Si6B4O40F7 | Trig. 3m : R3m |
Common Associates
Associated Minerals Based on Photo Data:
| 5 photos of Laptevite-(Ce) associated with Astrophyllite | K2NaFe2+7Ti2[Si4O12]2O2(OH)4F |
| 5 photos of Laptevite-(Ce) associated with Aegirine | NaFe3+Si2O6 |
| 4 photos of Laptevite-(Ce) associated with Bafertisite | Ba2Fe2+4Ti2(Si2O7)2O2(OH)2F2 |
| 3 photos of Laptevite-(Ce) associated with Quartz | SiO2 |
Related Minerals - Strunz-mindat Grouping
| 9.AJ. | Hingganite-(Nd) | Nd2◻Be2Si2O8(OH)2 |
| 9.AJ. | Arrheniusite-(Ce) | CaMg[(Ce7Y3)Ca5](SiO4)4(Si2B3AsO18)(BO3)F11 |
| 9.AJ.05 | Ominelite | (Fe2+,Mg)(Al,Fe3+)3(SiO4)(BO3)O2 |
| 9.AJ.05 | Grandidierite | (Mg,Fe2+)(Al,Fe3+)3(SiO4)(BO3)O2 |
| 9.AJ.10 | Dumortierite | Al(Al2O)(Al2O)2(SiO4)3(BO3) |
| 9.AJ.10 | Nioboholtite | (Nb0.6◻0.4)Al6BSi3O18 |
| 9.AJ.10 | Titanoholtite | (Ti0.75◻0.25)Al6BSi3O18 |
| 9.AJ.10 | Holtite | (Ta0.6◻0.4)Al6BSi3O18(O,OH)2.25 |
| 9.AJ.10 | Magnesiodumortierite | Mg(Al2OH)(Al2O)2(SiO4)3(BO3) |
| 9.AJ.15 | Garrelsite | Ba3NaSi2B7O16(OH)4 |
| 9.AJ.20 | Muromontite | near Be2FeY2Si3O12 |
| 9.AJ.20 | Gadolinite-(Nd) | Nd2Fe2+Be2O2(SiO4)2 |
| 9.AJ.20 | Datolite | CaB(SiO4)(OH) |
| 9.AJ.20 | Melanocerite-(Ce) | (Ce,Ca)5(SiO4,BO4)3(OH,O) |
| 9.AJ.20 | Gadolinite-(Ce) | (Ce,La,Nd,Y)2Fe2+Be2Si2O10 |
| 9.AJ.20 | Gadolinite-(Y) | Y2Fe2+Be2Si2O10 |
| 9.AJ.20 | Unnamed (OH-analogue of Gadolinite-(Y)) | (Y,Ca)2(Fe,◻)Be2Si2O8(OH,O)2 |
| 9.AJ.20 | Hingganite-(Ce) | (Ce,REE)2(◻,Fe2+)Be2[SiO4]2(OH)2 |
| 9.AJ.20 | Hingganite-(Y) | (Y,REE,Ca)2(◻,Fe2+)Be2[SiO4]2(OH)2 |
| 9.AJ.20 | Hingganite-(Yb) | (Yb,Y,REE)2◻Be2[SiO4]2(OH)2 |
| 9.AJ.20 | Homilite | Ca2(Fe2+,Mg)B2Si2O10 |
| 9.AJ.20 | Minasgeraisite-(Y) | (Ca2Y2)◻2(Be2B2)[SiO4]4(OH)4 |
| 9.AJ.20 | Calcybeborosilite-(Y) | (Y,Ca)2(◻,Fe2+)(B,Be)2[SiO4]2(OH,O)2 |
| 9.AJ.25 | Stillwellite-(La) | LaBSiO5 |
| 9.AJ.25 | Stillwellite-(Ce) | (Ce,La,Ca)BSiO5 |
| 9.AJ.30 | Cappelenite-(Y) | Ba(Y,Ce)6Si3B6O24F2 |
| 9.AJ.35 | Proshchenkoite-(Y) | Ca(Y,REE,Ca,Na,Mn)15Fe2+(P,Si)Si6B3O34F14 |
| 9.AJ.35 | Okanoganite-(Y) | (Na,Ca)3(Y,Ce)12Si6B2O27F14 |
| 9.AJ.35 | Hundholmenite-(Y) | (Y,REE,Ca,Na)15(Al,Fe3+)(CaxAs3+1-x)(Si,As5+)Si6B3(O,F)48 |
| 9.AJ.35 | Vicanite-(Ce) | (Ca,Ce,La,Th)15As5+(As3+0.5,Na0.5)Fe3+Si6B4O40F7 |
| 9.AJ.40 | Jadarite | LiNaSiB3O7(OH) |
Other Information
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)
mindat.org URL:
https://www.mindat.org/min-42866.html
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External Links:
References for Laptevite-(Ce)
Reference List:
Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2012) New minerals and nomenclature modifications approved in 2012. CNMNC Newsletter No 12. Mineralogical Magazine, 76 (1) 151-155 doi:10.1180/minmag.2012.076.1.151
Uvarova, Yulia A., Sokolova, Elena, Hawthorne, Frank C., Agakhanov, Atali A., Karpenko, Vladimir Y., Pautov, Leonid A. (2013) The crystal structure of laptevite-(Ce), NaFe2+(REE7Ca5Y3)(SiO4)4(Si3B2PO18)(BO3)F11, a new mineral species from the Darai-Pioz alkaline massif, Northern Tajikistan. Zeitschrift für Kristallographie - Crystalline Materials, 228. 550-557 doi:10.1524/zkri.2013.1623
Localities for Laptevite-(Ce)
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.
Kyrgyzstan | |
| Atali A.Agakhanov and Leonid A.Pautov ... |
Tajikistan (TL) | |
| Agakhanov et al. (2013) +1 other reference |
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Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan