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Laptevite-(Ce)

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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:
Name:
Named in honor of Tatyana Mikhailovna Lapteva (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)).



Classification of Laptevite-(Ce)Hide

Approved, Pending publication
Approval Year:
2011
First Published:
2013

Physical Properties of Laptevite-(Ce)Hide

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 (-)

Chemical Properties of Laptevite-(Ce)Hide

Formula:
Ca6(Fe2+,Mn2+)Y3REE7(SiO4)3(PO4)(B3Si3O18)(BO3)F11
IMA Formula:
NaFe2+(REE7Ca5Y3)(SiO4)4(Si3B2PO18)(BO3)F11

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
4.41Å(29)
3.13Å(26)
3.03Å(100)
2.982Å(85)
2.954Å(60)
2.689Å(40)
1.797Å(31)
1.770Å(21)

Type Occurrence of Laptevite-(Ce)Hide

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)Hide

Other Language Names for Laptevite-(Ce)Hide

Relationship of Laptevite-(Ce) to other SpeciesHide

Member of:
Other Members of this group:
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.

Common AssociatesHide

Associated Minerals Based on Photo Data:
5 photos of Laptevite-(Ce) associated with AstrophylliteK2NaFe2+7Ti2Si8O26(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

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.

References for Laptevite-(Ce)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Agakhanov, A.A., Pautov, L.A., Uvarova, Y., Karpenko, V.Y., Sokolova, E.V. and Hawthorne, F.C. (2012) Laptevite-(Ce), IMA 2011-081. CNMNC Newsletter No. 12, February 2012, page 153. Mineralogical Magazine: 76: 151-155.
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.
Uvarova, Y.A., Sokolova, E., Hawthorne, F.C., Agakhanov, A.A., Karpenko, V.Y., Pautov, L.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.

Internet Links 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 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Kyrgyzstan
 
  • Osh Region
    • Zeravshan range
      • Matcha massif
Atali A.Agakhanov and Leonid A.Pautov analytical data
Tajikistan (TL)
 
  • Districts of Republican Subordination
Agakhanov, A.A., Pautov, L.A., Uvarova, Y., Karpenko, V.Y., Sokolova, E.V. and Hawthorne, F.C. (2012): Laptevite-(Ce), IMA 2011-081. CNMNC Newsletter No. 12, February 2012, page 153; Mineralogical Magazine, 76, 151-155; Uvarova, Y.A., Sokolova, E., Hawthorne, F.C., Agakhanov, A.A., Karpenko, V.Y., Pautov, L.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.
 
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