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Pseudomorphosed pegmatite, Mount Ulyn Khuren, Khaldzan Buragtag massif, Myangad District, Khovd Province, Mongoliai
Regional Level Types
Pseudomorphosed pegmatitePegmatite
Mount Ulyn KhurenMountain
Khaldzan Buragtag massifMassif
Myangad DistrictDistrict
Khovd ProvinceProvince
MongoliaCountry

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Latitude & Longitude (WGS84):
48° North , 91° East (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~1km
Mindat Locality ID:
67488
Long-form identifier:
mindat:1:2:67488:0
GUID (UUID V4):
3c70a27e-c52e-4b19-83f0-c61a6da69b2d


In the beginning of August 1990, an alkaline granitic pegmatite was found by G.S. Ripp on the Northern slope of Mount Ulyn Khuren. It was given the name "Pseudomorphosed" after its enrichment in well-formed pseudomorphoses after an unknown REE-rich (up to 30% REE2O3) eudialyte-group mineral.
In the middle of August 1990 a similar but smaller pegmatite was found by P.M. Kartashov some hundreds m to the east. It obtained the name "Neprimetnyi" (Indiscernible) because of its size and position on mountain slope.

Both pegmatites contain apoeudialyte pseudomorphoses with ferriallanite-(Ce) as one of its main constituents. And both are TL for this mineral.
The pegmatites were produced by intrusion of rare metal alkaline granites of the intrusive phase V and crosscut coarse-grained nordmarkites of the intrusive phase I of the massif.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


16 valid minerals.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

β“˜ Aegirine
Formula: NaFe3+Si2O6
β“˜ Allanite-(Nd)
Formula: (CaNd)(AlAlFe2+)O[Si2O7][SiO4](OH)
βœͺ Arfvedsonite
Formula: [Na][Na2][Fe2+4Fe3+]Si8O22(OH)2
Description: Large (up to 18x8x3.5 cm) arfvedsonite crystals have been found in the quartz core of alkali granite pegmatites on the Northern slope of Mount Ulyn Khuren. The crystals are often twinned. The arfvedsonite is K-rich and has a very low Mg content.
β“˜ Clinofergusonite-(Y)
Formula: YNbO4
β“˜ 'Eudialyte Group'
Formula: [N(1)N(2)N(3)N(4)N(5)]3[M(1.1)M(1.2)]3[M(2.1)M(2.2)M(2.3)]3-6[M(3)M(4)]Z3[Si24O72]Θ4X(1)X(2)
β“˜ Fergusonite-(Y)
Formula: YNbO4
β“˜ Ferriallanite-(Ce)
Formula: (CaCe)(Fe3+AlFe2+)O[Si2O7][SiO4](OH)
β“˜ Fluorite
Formula: CaF2
β“˜ Hingganite-(Ce)
Formula: (Ce,REE)2(◻,Fe2+)Be2[SiO4]2(OH)2
β“˜ Hingganite-(Y)
Formula: (Y,REE,Ca)2(◻,Fe2+)Be2[SiO4]2(OH)2
β“˜ Kainosite-(Y)
Formula: Ca2(Y,Ce)2(Si4O12)(CO3) · H2O
β“˜ Microcline
Formula: K(AlSi3O8)
β“˜ Orthoclase
Formula: K(AlSi3O8)
β“˜ Percleveite-(Ce)
Formula: Ce2Si2O7
β“˜ 'Pyrochlore Group'
Formula: A2Nb2(O,OH)6Z
β“˜ 'Pyrochlore Group var. Ceriopyrochlore (of Hogarth 1977)'
Formula: A2Nb2(O,OH)6Z
β“˜ Quartz
Formula: SiO2
β“˜ Titanite
Formula: CaTi(SiO4)O
β“˜ Zircon
Formula: Zr(SiO4)

List of minerals arranged by Strunz 10th Edition classification

Group 3 - Halides
β“˜Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
β“˜'Pyrochlore Group
var. Ceriopyrochlore (of Hogarth 1977)'
4.00.A2Nb2(O,OH)6Z
β“˜''4.00.A2Nb2(O,OH)6Z
β“˜Quartz4.DA.05SiO2
β“˜Clinofergusonite-(Y)4.DG.10YNbO4
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
β“˜Fergusonite-(Y)7.GA.05YNbO4
Group 9 - Silicates
β“˜Zircon9.AD.30Zr(SiO4)
β“˜Titanite9.AG.15CaTi(SiO4)O
β“˜Hingganite-(Ce)9.AJ.20(Ce,REE)2(β—»,Fe2+)Be2[SiO4]2(OH)2
β“˜Hingganite-(Y)9.AJ.20(Y,REE,Ca)2(β—»,Fe2+)Be2[SiO4]2(OH)2
β“˜Percleveite-(Ce)9.BC.35Ce2Si2O7
β“˜Allanite-(Nd)9.BG.05b(CaNd)(AlAlFe2+)O[Si2O7][SiO4](OH)
β“˜Ferriallanite-(Ce)9.BG.05b(CaCe)(Fe3+AlFe2+)O[Si2O7][SiO4](OH)
β“˜Kainosite-(Y)9.CF.10Ca2(Y,Ce)2(Si4O12)(CO3) Β· H2O
β“˜Aegirine9.DA.25NaFe3+Si2O6
β“˜Arfvedsonite9.DE.25[Na][Na2][Fe2+4Fe3+]Si8O22(OH)2
β“˜Orthoclase9.FA.30K(AlSi3O8)
β“˜Microcline9.FA.30K(AlSi3O8)
Unclassified
β“˜'Eudialyte Group'-[N(1)N(2)N(3)N(4)N(5)]3[M(1.1)M(1.2)]3[M(2.1)M(2.2)M(2.3)]3-6[M(3)M(4)]Z3[Si24O72]Θ4X(1)X(2)

List of minerals for each chemical element

HHydrogen
Hβ“˜ Arfvedsonite[Na][Na2][Fe42+Fe3+]Si8O22(OH)2
Hβ“˜ Pyrochlore Group var. Ceriopyrochlore (of Hogarth 1977)A2Nb2(O,OH)6Z
Hβ“˜ Hingganite-(Ce)(Ce,REE)2(◻,Fe2+)Be2[SiO4]2(OH)2
Hβ“˜ Hingganite-(Y)(Y,REE,Ca)2(◻,Fe2+)Be2[SiO4]2(OH)2
Hβ“˜ Kainosite-(Y)Ca2(Y,Ce)2(Si4O12)(CO3) · H2O
Hβ“˜ Pyrochlore GroupA2Nb2(O,OH)6Z
Hβ“˜ Ferriallanite-(Ce)(CaCe)(Fe3+AlFe2+)O[Si2O7][SiO4](OH)
Hβ“˜ Allanite-(Nd)(CaNd)(AlAlFe2+)O[Si2O7][SiO4](OH)
BeBeryllium
Beβ“˜ Hingganite-(Ce)(Ce,REE)2(◻,Fe2+)Be2[SiO4]2(OH)2
Beβ“˜ Hingganite-(Y)(Y,REE,Ca)2(◻,Fe2+)Be2[SiO4]2(OH)2
CCarbon
Cβ“˜ Kainosite-(Y)Ca2(Y,Ce)2(Si4O12)(CO3) · H2O
OOxygen
Oβ“˜ AegirineNaFe3+Si2O6
Oβ“˜ Arfvedsonite[Na][Na2][Fe42+Fe3+]Si8O22(OH)2
Oβ“˜ Pyrochlore Group var. Ceriopyrochlore (of Hogarth 1977)A2Nb2(O,OH)6Z
Oβ“˜ Clinofergusonite-(Y)YNbO4
Oβ“˜ Fergusonite-(Y)YNbO4
Oβ“˜ Hingganite-(Ce)(Ce,REE)2(◻,Fe2+)Be2[SiO4]2(OH)2
Oβ“˜ Hingganite-(Y)(Y,REE,Ca)2(◻,Fe2+)Be2[SiO4]2(OH)2
Oβ“˜ Kainosite-(Y)Ca2(Y,Ce)2(Si4O12)(CO3) · H2O
Oβ“˜ MicroclineK(AlSi3O8)
Oβ“˜ OrthoclaseK(AlSi3O8)
Oβ“˜ Pyrochlore GroupA2Nb2(O,OH)6Z
Oβ“˜ QuartzSiO2
Oβ“˜ TitaniteCaTi(SiO4)O
Oβ“˜ ZirconZr(SiO4)
Oβ“˜ Eudialyte Group[N(1)N(2)N(3)N(4)N(5)]3[M(1.1)M(1.2)]3[M(2.1)M(2.2)M(2.3)]3-6[M(3)M(4)]Z3[Si24O72]Θ4X(1)X(2)
Oβ“˜ Ferriallanite-(Ce)(CaCe)(Fe3+AlFe2+)O[Si2O7][SiO4](OH)
Oβ“˜ Percleveite-(Ce)Ce2Si2O7
Oβ“˜ Allanite-(Nd)(CaNd)(AlAlFe2+)O[Si2O7][SiO4](OH)
FFluorine
Fβ“˜ FluoriteCaF2
NaSodium
Naβ“˜ AegirineNaFe3+Si2O6
Naβ“˜ Arfvedsonite[Na][Na2][Fe42+Fe3+]Si8O22(OH)2
AlAluminium
Alβ“˜ MicroclineK(AlSi3O8)
Alβ“˜ OrthoclaseK(AlSi3O8)
Alβ“˜ Ferriallanite-(Ce)(CaCe)(Fe3+AlFe2+)O[Si2O7][SiO4](OH)
Alβ“˜ Allanite-(Nd)(CaNd)(AlAlFe2+)O[Si2O7][SiO4](OH)
SiSilicon
Siβ“˜ AegirineNaFe3+Si2O6
Siβ“˜ Arfvedsonite[Na][Na2][Fe42+Fe3+]Si8O22(OH)2
Siβ“˜ Hingganite-(Ce)(Ce,REE)2(◻,Fe2+)Be2[SiO4]2(OH)2
Siβ“˜ Hingganite-(Y)(Y,REE,Ca)2(◻,Fe2+)Be2[SiO4]2(OH)2
Siβ“˜ Kainosite-(Y)Ca2(Y,Ce)2(Si4O12)(CO3) · H2O
Siβ“˜ MicroclineK(AlSi3O8)
Siβ“˜ OrthoclaseK(AlSi3O8)
Siβ“˜ QuartzSiO2
Siβ“˜ TitaniteCaTi(SiO4)O
Siβ“˜ ZirconZr(SiO4)
Siβ“˜ Eudialyte Group[N(1)N(2)N(3)N(4)N(5)]3[M(1.1)M(1.2)]3[M(2.1)M(2.2)M(2.3)]3-6[M(3)M(4)]Z3[Si24O72]Θ4X(1)X(2)
Siβ“˜ Ferriallanite-(Ce)(CaCe)(Fe3+AlFe2+)O[Si2O7][SiO4](OH)
Siβ“˜ Percleveite-(Ce)Ce2Si2O7
Siβ“˜ Allanite-(Nd)(CaNd)(AlAlFe2+)O[Si2O7][SiO4](OH)
KPotassium
Kβ“˜ MicroclineK(AlSi3O8)
Kβ“˜ OrthoclaseK(AlSi3O8)
CaCalcium
Caβ“˜ FluoriteCaF2
Caβ“˜ Hingganite-(Y)(Y,REE,Ca)2(◻,Fe2+)Be2[SiO4]2(OH)2
Caβ“˜ Kainosite-(Y)Ca2(Y,Ce)2(Si4O12)(CO3) · H2O
Caβ“˜ TitaniteCaTi(SiO4)O
Caβ“˜ Ferriallanite-(Ce)(CaCe)(Fe3+AlFe2+)O[Si2O7][SiO4](OH)
Caβ“˜ Allanite-(Nd)(CaNd)(AlAlFe2+)O[Si2O7][SiO4](OH)
TiTitanium
Tiβ“˜ TitaniteCaTi(SiO4)O
FeIron
Feβ“˜ AegirineNaFe3+Si2O6
Feβ“˜ Arfvedsonite[Na][Na2][Fe42+Fe3+]Si8O22(OH)2
Feβ“˜ Hingganite-(Ce)(Ce,REE)2(◻,Fe2+)Be2[SiO4]2(OH)2
Feβ“˜ Hingganite-(Y)(Y,REE,Ca)2(◻,Fe2+)Be2[SiO4]2(OH)2
Feβ“˜ Ferriallanite-(Ce)(CaCe)(Fe3+AlFe2+)O[Si2O7][SiO4](OH)
Feβ“˜ Allanite-(Nd)(CaNd)(AlAlFe2+)O[Si2O7][SiO4](OH)
YYttrium
Yβ“˜ Clinofergusonite-(Y)YNbO4
Yβ“˜ Fergusonite-(Y)YNbO4
Yβ“˜ Hingganite-(Y)(Y,REE,Ca)2(◻,Fe2+)Be2[SiO4]2(OH)2
Yβ“˜ Kainosite-(Y)Ca2(Y,Ce)2(Si4O12)(CO3) · H2O
ZrZirconium
Zrβ“˜ ZirconZr(SiO4)
NbNiobium
Nbβ“˜ Pyrochlore Group var. Ceriopyrochlore (of Hogarth 1977)A2Nb2(O,OH)6Z
Nbβ“˜ Clinofergusonite-(Y)YNbO4
Nbβ“˜ Fergusonite-(Y)YNbO4
Nbβ“˜ Pyrochlore GroupA2Nb2(O,OH)6Z
CeCerium
Ceβ“˜ Hingganite-(Ce)(Ce,REE)2(◻,Fe2+)Be2[SiO4]2(OH)2
Ceβ“˜ Kainosite-(Y)Ca2(Y,Ce)2(Si4O12)(CO3) · H2O
Ceβ“˜ Ferriallanite-(Ce)(CaCe)(Fe3+AlFe2+)O[Si2O7][SiO4](OH)
Ceβ“˜ Percleveite-(Ce)Ce2Si2O7
NdNeodymium
Ndβ“˜ Allanite-(Nd)(CaNd)(AlAlFe2+)O[Si2O7][SiO4](OH)

Other Regions, Features and Areas containing this locality

AsiaContinent
Eurasian PlateTectonic Plate

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