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
GUID
(UUID V4):
(UUID V4):
e67c6117-5b61-4db4-b621-3263a1a53a49
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
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
Chemistry of Laptevite-(Ce)
Mindat Formula:
Ca6(Fe2+,Mn2+)Y3REE7(SiO4)3(PO4)(B3Si3O18)(BO3)F11
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) |
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:
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: 5-11.
Synonyms of Laptevite-(Ce)
Other Language Names for Laptevite-(Ce)
Russian:Лаптевит-(Ce)
Relationship of Laptevite-(Ce) to other Species
Member of:
Other Members of this 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+7Ti2Si8O26(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 | Grandidierite | (Mg,Fe2+)(Al,Fe3+)3(SiO4)(BO3)O2 |
9.AJ.05 | Ominelite | (Fe2+,Mg)(Al,Fe3+)3(SiO4)(BO3)O2 |
9.AJ.10 | Dumortierite | Al(Al2O)(Al2O)2(SiO4)3(BO3) |
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.10 | Nioboholtite | (Nb0.6◻0.4)Al6BSi3O18 |
9.AJ.10 | Titanoholtite | (Ti0.75◻0.25)Al6BSi3O18 |
9.AJ.15 | Garrelsite | Ba3NaSi2B7O16(OH)4 |
9.AJ.20 | Muromontite | near Be2FeY2Si3O12 |
9.AJ.20 | Datolite | CaB(SiO4)(OH) |
9.AJ.20 | Gadolinite-(Ce) | (Ce,La,Nd,Y)2Fe2+Be2Si2O10 |
9.AJ.20 | Gadolinite-(Y) | Y2Fe2+Be2Si2O10 |
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 | Melanocerite-(Ce) | (Ce,Ca)5(SiO4,BO4)3(OH,0) |
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.20 | Gadolinite-(Nd) | Nd2Fe2+Be2O2(SiO4)2 |
9.AJ.20 | Unnamed (OH-analogue of Gadolinite-(Y)) | (Y,Ca)2(Fe,◻)Be2Si2O8(OH,O)2 |
9.AJ.25 | Stillwellite-(Ce) | (Ce,La,Ca)BSiO5 |
9.AJ.30 | Cappelenite-(Y) | Ba(Y,Ce)6Si3B6O24F2 |
9.AJ.35 | Okanoganite-(Y) | (Na,Ca)3(Y,Ce)12Si6B2O27F14 |
9.AJ.35 | Vicanite-(Ce) | (Ca,Ce,La,Th)15As5+(As3+0.5,Na0.5)Fe3+Si6B4O40F7 |
9.AJ.35 | Hundholmenite-(Y) | (Y,REE,Ca,Na)15(Al,Fe3+)(CaxAs3+1-x)(Si,As5+)Si6B3(O,F)48 |
9.AJ.35 | Proshchenkoite-(Y) | Ca(Y,REE,Ca,Na,Mn)15Fe2+(P,Si)Si6B3O34F14 |
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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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)
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.
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Gere-Su river, Matcha massif, Zeravshan range, Batken Region, Kyrgyzstan