Tsakhirin Khuduk Y-Zr-Nb deposit, Khaldzan Buragtag massif, Altai Mts, Hovd Aimag (Khovd Aimag), Mongolia

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Aenigmatite : Na₂Fe²⁺₅TiO₂(Si₆O₁₈), Arfvedsonite : [Na][Na₂][Fe²⁺₄Fe³⁺][(OH)₂\|Si₈O₂₂], Orthoclase : K[AlSi₃O₈], Quartz : SiO₂
	Tsakhirin Khuduk Y-Zr-Nb deposit, Khaldzan Buragtag massif, Altai Mts, Hovd Aimag (Khovd Aimag), Mongolia Large black laths of aenigmatite (some of them are up to 10 cm long) into nordmarkit-pegmatite from the northern slope of Ulyn Khuren Mt. Exactly this specimen wasn't investigated, but some crystals of this primary aenigmatite were decay into mixture of wilkinsonite, magnetite, ilmenite, two unidentified (new?) alkaline Fe-silicates and ...
© Pavel M. Kartashov	Photo ID: 142972 View Count: 194
Aluminocerite-(Ce) : (Ce,La,Ca)₉(Al,Fe³⁺)(SiO₄)₃[SiO₃(OH)]₄(OH)₃, Chevkinite-(Ce) : (Ce,La,Ca,Th)₄(Fe²⁺,Mg)(Fe²⁺,Ti,Fe³⁺)₂(Ti,Fe³⁺)₂[O₄\|Si₂O₇]₂
	Tsakhirin Khuduk Y-Zr-Nb deposit, Khaldzan Buragtag massif, Altai Mts, Hovd Aimag (Khovd Aimag), Mongolia Pink triangular tabular crystals of aluminocerite (IMA2007-060) into cavities of black niobian chevkinite large crystal. FOV ~4x3 mm. Selfcollected in the trench #2 of Western ore zone of the deposit in July 1990. Pavel M. Kartashov collection and photo.
© Pavel M. Kartashov	Photo ID: 110012 View Count: 208
Aluminocerite-(Ce) : (Ce,La,Ca)₉(Al,Fe³⁺)(SiO₄)₃[SiO₃(OH)]₄(OH)₃, Fergusonite-(Y) : YNbO₄, Chevkinite-(Ce) : (Ce,La,Ca,Th)₄(Fe²⁺,Mg)(Fe²⁺,Ti,Fe³⁺)₂(Ti,Fe³⁺)₂[O₄\|Si₂O₇]₂, Quartz : SiO₂
	Tsakhirin Khuduk Y-Zr-Nb deposit, Khaldzan Buragtag massif, Altai Mts, Hovd Aimag (Khovd Aimag), Mongolia Pinkish-red crystals of Aluminocerite-(Ce) (IMA2007-060) into cavity on the border of quartz and intergrowth of black chevkinite-(Ce) and brown metamict glue-like fergusonite-(Y). FOV is ~4x3.5 mm. Selfcollected in the trench #2 of Western ore zone of the deposit in July 1990. Pavel M. Kartashov collection and photo.
© Pavel M. Kartashov	Photo ID: 110021 View Count: 130
Aluminocerite-(Ce) : (Ce,La,Ca)₉(Al,Fe³⁺)(SiO₄)₃[SiO₃(OH)]₄(OH)₃, Chevkinite-(Ce) : (Ce,La,Ca,Th)₄(Fe²⁺,Mg)(Fe²⁺,Ti,Fe³⁺)₂(Ti,Fe³⁺)₂[O₄\|Si₂O₇]₂, Titanite : CaTi[O\|SiO₄], Zircon : Zr[SiO₄], Epidote : {Ca₂}{Al₂Fe³⁺}[O\|OH\|SiO₄\|Si₂O₇]
	Tsakhirin Khuduk Y-Zr-Nb deposit, Khaldzan Buragtag massif, Altai Mts, Hovd Aimag (Khovd Aimag), Mongolia Pinkish-red grains of Aluminocerite-(Ce) (IMA2007-060) in fibrous whitish fersmite-synchysite-titanite crust of alteration of black niobian chevkinite-(Ce). Brownish crystals of zircon and green ones of epidote are visible. Selfcollected in the trench #2 of Western ore zone of the deposit in July 1990. Pavel M. Kartashov collection and photo.
© Pavel M. Kartashov	Photo ID: 110016 View Count: 114
Aluminocerite-(Ce) : (Ce,La,Ca)₉(Al,Fe³⁺)(SiO₄)₃[SiO₃(OH)]₄(OH)₃
	Tsakhirin Khuduk Y-Zr-Nb deposit, Khaldzan Buragtag massif, Altai Mts, Hovd Aimag (Khovd Aimag), Mongolia Pinkish-red crystals of aluminocerite (IMA2007-060) into cavity on the border of large crystal of chevkinite-(Ce) and epidote. White crusts are the secondary calcite. FOV ~5x4 mm. Selfcollected in the trench #2 of Western ore zone of the deposit in July 1990. Pavel M. Kartashov collection and photo.
© Pavel M. Kartashov	Photo ID: 110020 View Count: 114
Chevkinite-(Ce) : (Ce,La,Ca,Th)₄(Fe²⁺,Mg)(Fe²⁺,Ti,Fe³⁺)₂(Ti,Fe³⁺)₂[O₄\|Si₂O₇]₂, Aluminocerite-(Ce) : (Ce,La,Ca)₉(Al,Fe³⁺)(SiO₄)₃[SiO₃(OH)]₄(OH)₃, Allanite-(Ce) : {CaCe}{Al₂Fe²⁺}[O\|OH\|SiO₄\|Si₂O₇], Ferriallanite-(Ce) : {CaCe}{Fe³⁺AlFe²⁺}[O\|OH\|SiO₄\|Si₂O₇], Zircon : Zr[SiO₄]
	Tsakhirin Khuduk Y-Zr-Nb deposit, Khaldzan Buragtag massif, Altai Mts, Hovd Aimag (Khovd Aimag), Mongolia Termination of large broken Chevkinite-(Ce) crystal from rare-metal alkaline pegmatite. Surface of the crystal (the right part of the picture) is altered and overgrown by later brown astrophyllite-like allanite-(Ce), pink crystals of IMA2007-060 (aluminoan cerite), and microscopic hingganites-(Ce) and -(Nd) (unvisible according to their small ...
© Pavel M. Kartashov	Photo ID: 210243 View Count: 83
Chevkinite-(Ce) : (Ce,La,Ca,Th)₄(Fe²⁺,Mg)(Fe²⁺,Ti,Fe³⁺)₂(Ti,Fe³⁺)₂[O₄\|Si₂O₇]₂, Epidote : {Ca₂}{Al₂Fe³⁺}[O\|OH\|SiO₄\|Si₂O₇], Actinolite : ☐Ca₂(Mg,Fe²⁺)₅(Si₈O₂₂)(OH)₂, Quartz : SiO₂
	Tsakhirin Khuduk Y-Zr-Nb deposit, Khaldzan Buragtag massif, Altai Mts, Hovd Aimag (Khovd Aimag), Mongolia Prismatic crystals of black Nb-bearing Chevkinite-(Ce) in epidot-quartz metasomatites of the deposit. Largest crystal length is 2 cm. This metasomatite was appear after Ca matasomatic replacement of rare-metal alkaline pegmatite similar to located close to this place Tatyana pegmatite. Olive-green epidote had completely replace microcline ...
© Pavel M. Kartashov	Photo ID: 210233 View Count: 60
Chevkinite-(Ce) : (Ce,La,Ca,Th)₄(Fe²⁺,Mg)(Fe²⁺,Ti,Fe³⁺)₂(Ti,Fe³⁺)₂[O₄\|Si₂O₇]₂, Fergusonite-(Y) : YNbO₄, Aluminocerite-(Ce) : (Ce,La,Ca)₉(Al,Fe³⁺)(SiO₄)₃[SiO₃(OH)]₄(OH)₃, Quartz : SiO₂
	Tsakhirin Khuduk Y-Zr-Nb deposit, Khaldzan Buragtag massif, Altai Mts, Hovd Aimag (Khovd Aimag), Mongolia Large broken grain of black niobian Chevkinite-(Ce) from rare-metal alkaline pegmatite. Associated minerals are: brown lustrous grain of fergusonite-(Y), pink masses of small crystals of aluminocerite-(Ce) (IMA2007-060), dark-grey veinlets of allanite-(Ce) in quartz. Microscopic hingganites-(Ce), -(Y) and -(Nd) (unvisible according to their small ...
© Pavel M. Kartashov	Photo ID: 211075 View Count: 54
Fergusonite-(Y) : YNbO₄
	Tsakhirin Khuduk Y-Zr-Nb deposit, Khaldzan Buragtag massif, Altai Mts, Hovd Aimag (Khovd Aimag), Mongolia Cross section of the large fergusonite-(Y) spherulitic crystaline cluster. Mineral is completely metamict, so we see glassy conchoidal surface. This fergusonite is extremely enriched with Nd so it may contain zones and spots of fergusonite-(Nd). Associated minerals are quartz, epidote, allanite-(Ce) and zircon. Specimen size is 4x4x1.5 cm and its ...
© Pavel M. Kartashov	Photo ID: 72814 View Count: 268
Ferriallanite-(Ce) : {CaCe}{Fe³⁺AlFe²⁺}[O\|OH\|SiO₄\|Si₂O₇], Stilpnomelane (Var: Ferristilpnomelane) : K(Fe³⁺,Mg,Fe²⁺)₈(Si,Al)₁₂(O,OH)₂₇, Epidote : {Ca₂}{Al₂Fe³⁺}[O\|OH\|SiO₄\|Si₂O₇]
	Tsakhirin Khuduk Y-Zr-Nb deposit, Khaldzan Buragtag massif, Altai Mts, Hovd Aimag (Khovd Aimag), Mongolia Black rosettes of ferriallanite-(Ce) and brown platelets of ferristilpnomelane in quartz-epidote metasomatites after alkaline granite pegmatite. FOV is ~12x10 mm. Selfcollected in 1990 on the Eastern ore zone of the locality. Pavel M. Kartashov collection and photo.
© Pavel M. Kartashov	Photo ID: 129853 View Count: 136

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Tsakhirin Khuduk Y-Zr-Nb deposit, Khaldzan Buragtag massif, Altai Mts, Hovd Aimag (Khovd Aimag), Mongolia

Aenigmatite : Na₂Fe²⁺₅TiO₂(Si₆O₁₈), Arfvedsonite : [Na][Na₂][Fe²⁺₄Fe³⁺][(OH)₂|Si₈O₂₂], Orthoclase : K[AlSi₃O₈], Quartz : SiO₂

Aluminocerite-(Ce) : (Ce,La,Ca)₉(Al,Fe³⁺)(SiO₄)₃[SiO₃(OH)]₄(OH)₃, Chevkinite-(Ce) : (Ce,La,Ca,Th)₄(Fe²⁺,Mg)(Fe²⁺,Ti,Fe³⁺)₂(Ti,Fe³⁺)₂[O₄|Si₂O₇]₂

Aluminocerite-(Ce) : (Ce,La,Ca)₉(Al,Fe³⁺)(SiO₄)₃[SiO₃(OH)]₄(OH)₃, Fergusonite-(Y) : YNbO₄, Chevkinite-(Ce) : (Ce,La,Ca,Th)₄(Fe²⁺,Mg)(Fe²⁺,Ti,Fe³⁺)₂(Ti,Fe³⁺)₂[O₄|Si₂O₇]₂, Quartz : SiO₂

Aluminocerite-(Ce) : (Ce,La,Ca)₉(Al,Fe³⁺)(SiO₄)₃[SiO₃(OH)]₄(OH)₃, Chevkinite-(Ce) : (Ce,La,Ca,Th)₄(Fe²⁺,Mg)(Fe²⁺,Ti,Fe³⁺)₂(Ti,Fe³⁺)₂[O₄|Si₂O₇]₂, Titanite : CaTi[O|SiO₄], Zircon : Zr[SiO₄], Epidote : {Ca₂}{Al₂Fe³⁺}[O|OH|SiO₄|Si₂O₇]

Aluminocerite-(Ce) : (Ce,La,Ca)₉(Al,Fe³⁺)(SiO₄)₃[SiO₃(OH)]₄(OH)₃

Chevkinite-(Ce) : (Ce,La,Ca,Th)₄(Fe²⁺,Mg)(Fe²⁺,Ti,Fe³⁺)₂(Ti,Fe³⁺)₂[O₄|Si₂O₇]₂, Epidote : {Ca₂}{Al₂Fe³⁺}[O|OH|SiO₄|Si₂O₇], Actinolite : ☐Ca₂(Mg,Fe²⁺)₅(Si₈O₂₂)(OH)₂, Quartz : SiO₂

Chevkinite-(Ce) : (Ce,La,Ca,Th)₄(Fe²⁺,Mg)(Fe²⁺,Ti,Fe³⁺)₂(Ti,Fe³⁺)₂[O₄|Si₂O₇]₂, Fergusonite-(Y) : YNbO₄, Aluminocerite-(Ce) : (Ce,La,Ca)₉(Al,Fe³⁺)(SiO₄)₃[SiO₃(OH)]₄(OH)₃, Quartz : SiO₂

Fergusonite-(Y) : YNbO₄

Ferriallanite-(Ce) : {CaCe}{Fe³⁺AlFe²⁺}[O|OH|SiO₄|Si₂O₇], Stilpnomelane (Var: Ferristilpnomelane) : K(Fe³⁺,Mg,Fe²⁺)₈(Si,Al)₁₂(O,OH)₂₇, Epidote : {Ca₂}{Al₂Fe³⁺}[O|OH|SiO₄|Si₂O₇]

Tsakhirin Khuduk Y-Zr-Nb deposit, Khaldzan Buragtag massif, Altai Mts, Hovd Aimag (Khovd Aimag), Mongolia

Aenigmatite : Na2Fe2+5TiO2(Si6O18), Arfvedsonite : [Na][Na2][Fe2+4Fe3+][(OH)2|Si8O22], Orthoclase : K[AlSi3O8], Quartz : SiO2

Aluminocerite-(Ce) : (Ce,La,Ca)9(Al,Fe3+)(SiO4)3[SiO3(OH)]4(OH)3, Chevkinite-(Ce) : (Ce,La,Ca,Th)4(Fe2+,Mg)(Fe2+,Ti,Fe3+)2(Ti,Fe3+)2[O4|Si2O7]2

Aluminocerite-(Ce) : (Ce,La,Ca)9(Al,Fe3+)(SiO4)3[SiO3(OH)]4(OH)3, Fergusonite-(Y) : YNbO4, Chevkinite-(Ce) : (Ce,La,Ca,Th)4(Fe2+,Mg)(Fe2+,Ti,Fe3+)2(Ti,Fe3+)2[O4|Si2O7]2, Quartz : SiO2

Aluminocerite-(Ce) : (Ce,La,Ca)9(Al,Fe3+)(SiO4)3[SiO3(OH)]4(OH)3, Chevkinite-(Ce) : (Ce,La,Ca,Th)4(Fe2+,Mg)(Fe2+,Ti,Fe3+)2(Ti,Fe3+)2[O4|Si2O7]2, Titanite : CaTi[O|SiO4], Zircon : Zr[SiO4], Epidote : {Ca2}{Al2Fe3+}[O|OH|SiO4|Si2O7]

Aluminocerite-(Ce) : (Ce,La,Ca)9(Al,Fe3+)(SiO4)3[SiO3(OH)]4(OH)3

Chevkinite-(Ce) : (Ce,La,Ca,Th)4(Fe2+,Mg)(Fe2+,Ti,Fe3+)2(Ti,Fe3+)2[O4|Si2O7]2, Aluminocerite-(Ce) : (Ce,La,Ca)9(Al,Fe3+)(SiO4)3[SiO3(OH)]4(OH)3, Allanite-(Ce) : {CaCe}{Al2Fe2+}[O|OH|SiO4|Si2O7], Ferriallanite-(Ce) : {CaCe}{Fe3+AlFe2+}[O|OH|SiO4|Si2O7], Zircon : Zr[SiO4]

Chevkinite-(Ce) : (Ce,La,Ca,Th)4(Fe2+,Mg)(Fe2+,Ti,Fe3+)2(Ti,Fe3+)2[O4|Si2O7]2, Epidote : {Ca2}{Al2Fe3+}[O|OH|SiO4|Si2O7], Actinolite : ☐Ca2(Mg,Fe2+)5(Si8O22)(OH)2, Quartz : SiO2

Chevkinite-(Ce) : (Ce,La,Ca,Th)4(Fe2+,Mg)(Fe2+,Ti,Fe3+)2(Ti,Fe3+)2[O4|Si2O7]2, Fergusonite-(Y) : YNbO4, Aluminocerite-(Ce) : (Ce,La,Ca)9(Al,Fe3+)(SiO4)3[SiO3(OH)]4(OH)3, Quartz : SiO2

Fergusonite-(Y) : YNbO4

Ferriallanite-(Ce) : {CaCe}{Fe3+AlFe2+}[O|OH|SiO4|Si2O7], Stilpnomelane (Var: Ferristilpnomelane) : K(Fe3+,Mg,Fe2+)8(Si,Al)12(O,OH)27, Epidote : {Ca2}{Al2Fe3+}[O|OH|SiO4|Si2O7]

Aenigmatite : Na₂Fe²⁺₅TiO₂(Si₆O₁₈), Arfvedsonite : [Na][Na₂][Fe²⁺₄Fe³⁺][(OH)₂|Si₈O₂₂], Orthoclase : K[AlSi₃O₈], Quartz : SiO₂

Aluminocerite-(Ce) : (Ce,La,Ca)₉(Al,Fe³⁺)(SiO₄)₃[SiO₃(OH)]₄(OH)₃, Chevkinite-(Ce) : (Ce,La,Ca,Th)₄(Fe²⁺,Mg)(Fe²⁺,Ti,Fe³⁺)₂(Ti,Fe³⁺)₂[O₄|Si₂O₇]₂

Aluminocerite-(Ce) : (Ce,La,Ca)₉(Al,Fe³⁺)(SiO₄)₃[SiO₃(OH)]₄(OH)₃, Fergusonite-(Y) : YNbO₄, Chevkinite-(Ce) : (Ce,La,Ca,Th)₄(Fe²⁺,Mg)(Fe²⁺,Ti,Fe³⁺)₂(Ti,Fe³⁺)₂[O₄|Si₂O₇]₂, Quartz : SiO₂

Aluminocerite-(Ce) : (Ce,La,Ca)₉(Al,Fe³⁺)(SiO₄)₃[SiO₃(OH)]₄(OH)₃, Chevkinite-(Ce) : (Ce,La,Ca,Th)₄(Fe²⁺,Mg)(Fe²⁺,Ti,Fe³⁺)₂(Ti,Fe³⁺)₂[O₄|Si₂O₇]₂, Titanite : CaTi[O|SiO₄], Zircon : Zr[SiO₄], Epidote : {Ca₂}{Al₂Fe³⁺}[O|OH|SiO₄|Si₂O₇]

Aluminocerite-(Ce) : (Ce,La,Ca)₉(Al,Fe³⁺)(SiO₄)₃[SiO₃(OH)]₄(OH)₃

Chevkinite-(Ce) : (Ce,La,Ca,Th)₄(Fe²⁺,Mg)(Fe²⁺,Ti,Fe³⁺)₂(Ti,Fe³⁺)₂[O₄|Si₂O₇]₂, Epidote : {Ca₂}{Al₂Fe³⁺}[O|OH|SiO₄|Si₂O₇], Actinolite : ☐Ca₂(Mg,Fe²⁺)₅(Si₈O₂₂)(OH)₂, Quartz : SiO₂

Chevkinite-(Ce) : (Ce,La,Ca,Th)₄(Fe²⁺,Mg)(Fe²⁺,Ti,Fe³⁺)₂(Ti,Fe³⁺)₂[O₄|Si₂O₇]₂, Fergusonite-(Y) : YNbO₄, Aluminocerite-(Ce) : (Ce,La,Ca)₉(Al,Fe³⁺)(SiO₄)₃[SiO₃(OH)]₄(OH)₃, Quartz : SiO₂

Fergusonite-(Y) : YNbO₄

Ferriallanite-(Ce) : {CaCe}{Fe³⁺AlFe²⁺}[O|OH|SiO₄|Si₂O₇], Stilpnomelane (Var: Ferristilpnomelane) : K(Fe³⁺,Mg,Fe²⁺)₈(Si,Al)₁₂(O,OH)₂₇, Epidote : {Ca₂}{Al₂Fe³⁺}[O|OH|SiO₄|Si₂O₇]