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Biraite-(Ce) : Ce2Fe2+[CO3|Si2O7] | |
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Biraya Fe-REE ore occurrence, Biraya and Bya Rivers confluence area (Chara Basin), Vitim Plateau, Buriatia (Buryatia) Republic, Transbaikalia (Zabaykalye), Eastern-Siberian Region, Russia Brown grains of biraite-(Ce) of the first generation. Small size, light brown colour, transparency and replacement by hydroxylbastnasite-(Ce) are charecteristic for this generation. Associating minerals are: black ferriallanite-(Ce), marine-green fibrous sodian actinolite, white strontian calcite, light-greenish apatite-like calcian strontianite, ... |
| © Pavel M. Kartashov | Photo ID: 75077 View Count: 413 |
Biraite-(Ce) : Ce2Fe2+[CO3|Si2O7], Cordylite-(Ce) : (Na,Ca)BaCe2(CO3)4F | |
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Biraya Fe-REE ore occurrence, Biraya and Bya Rivers confluence area (Chara Basin), Vitim Plateau, Buriatia (Buryatia) Republic, Transbaikalia (Zabaykalye), Eastern-Siberian Region, Russia Brown grains of Biraite-(Ce) of the first generation. Small size, light brown colour, transparency and replacement by Hydroxylbastnasite-(Ce) are charecteristic for this generation. Associating minerals are: black Ferriallanite-(Ce), marine-green fibrous sodian Actinolite, white strontian Calcite, honey-yellow Cordylite-(Ce) (at the upper right ... |
| © Pavel M. Kartashov | Photo ID: 75078 View Count: 254 |
Cordylite-(Ce) : (Na,Ca)BaCe2(CO3)4F, Strontianite : SrCO3, Calcite (Var: Strontian Calcite) : (Ca,Sr)CO3, Talc : Mg3Si4O10(OH)2 | |
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Biraya Fe-REE ore occurrence, Biraya and Bya Rivers confluence area (Chara Basin), Vitim Plateau, Buriatia (Buryatia) Republic, Transbaikalia (Zabaykalye), Eastern-Siberian Region, Russia 2.5 mm long striated prismatic crystal of Cordylite-(Ce). Cordylite of the locality has formula NaCaBa2{(Ce,La,Nd)3Sr}[CO3]8(F,OH)2 and probably is a new mineral specie. Associated greenish, apatite-like Strontianite also has unusual composition close to (Sr.5Ca.5)[CO3] and is intermediate member of strontianite-aragonite series. Other associating ... |
| © Pavel M. Kartashov | Photo ID: 106757 View Count: 158 |
Fergusonite-(Nd) : (Nd,Ce)(Nb,Ti)O4, Ferriallanite-(Ce) : {CaCe}{Fe3+AlFe2+}[O|OH|SiO4|Si2O7] | |
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Biraya Fe-REE ore occurrence, Biraya and Bya Rivers confluence area (Chara Basin), Vitim Plateau, Buriatia (Buryatia) Republic, Transbaikalia (Zabaykalye), Eastern-Siberian Region, Russia 5 mm in diameter segregation of orange-brown ferusonite-(Nd) grains in ferriallanite-(Ce) zone of the vein. Composition of the fergusonite is (Nd.40Ce.20Sm.08Pr.04Gd.03La.03Eu.02Ca.06Th.01)0.87Nb1O3.57(OH)0.43 . Usually it is overgrown by black micro-grains of new mineral phase Ce(Fe",Nb,Ti)SiO5. Main black inclusions are ferriallanite-(Ce) ... |
| © Pavel M. Kartashov | Photo ID: 73130 View Count: 345 |
Ferriallanite-(Ce) : {CaCe}{Fe3+AlFe2+}[O|OH|SiO4|Si2O7] | |
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Biraya Fe-REE ore occurrence, Biraya and Bya Rivers confluence area (Chara Basin), Vitim Plateau, Buriatia (Buryatia) Republic, Transbaikalia (Zabaykalye), Eastern-Siberian Region, Russia Ferriallanite-(Ce) with composition very close to the end member CaCeFe3+AlFe2+[SiO4][Si2O7]O(OH). Darck-brown translucent short prismatic crystals of ferriallanite-(Ce) associated with calcite and barroisite. Size of field of view 12x10 mm. "Cordylitovaya" carbonatite vein. P.M. Kartashov collection and photo. |
| © Pavel M. Kartashov | Photo ID: 32145 View Count: 385 |
Ferriallanite-(Ce) : {CaCe}{Fe3+AlFe2+}[O|OH|SiO4|Si2O7] | |
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Biraya Fe-REE ore occurrence, Biraya and Bya Rivers confluence area (Chara Basin), Vitim Plateau, Buriatia (Buryatia) Republic, Transbaikalia (Zabaykalye), Eastern-Siberian Region, Russia Ferriallanite-(Ce) with some excess of Al transitive to the allanite end member CaCeAlAlFe2+[SiO4][Si2O7]O(OH). Triangular segregation of dark-brown to black translucent isometric grains of ferriallanite-(Ce) associated with white calcite, yellow monazite-(Ce), orange-brown fergusonite-(Nd), marine-green sodic actinolite and pyrite. Specimen ... |
| © Pavel M. Kartashov | Photo ID: 32569 View Count: 375 |
Ferriallanite-(Ce) : {CaCe}{Fe3+AlFe2+}[O|OH|SiO4|Si2O7] | |
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Biraya Fe-REE ore occurrence, Biraya and Bya Rivers confluence area (Chara Basin), Vitim Plateau, Buriatia (Buryatia) Republic, Transbaikalia (Zabaykalye), Eastern-Siberian Region, Russia Tabular crystals of shining brownish-black Ferriallanite-(Ce) grow along contact of carbonatite vein with shist host rock. This ferriallanite has composition very close to end member. Associating minerals are white strontian Calcite and minor prismatic marine-green sodic Actinolite. Specimen size is 7x5 cm. Selfcollected in August of 2002 on ... |
| © Pavel M. Kartashov | Photo ID: 248827 View Count: 23 |
Törnebohmite-(Ce) : (Ce,La)2Al(SiO4)2OH, Ferriallanite-(Ce) : {CaCe}{Fe3+AlFe2+}[O|OH|SiO4|Si2O7], Unnamed (O- and Fe-analogue of Västmanlandite-(Ce)) : Ca(Ce,La)3Al2Fe2+Fe3+[O|(OH)2|(SiO4)3|Si2O7], Strontianite (Var: Emmonite) : (Sr,Ca)CO3 | |
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Biraya Fe-REE ore occurrence, Biraya and Bya Rivers confluence area (Chara Basin), Vitim Plateau, Buriatia (Buryatia) Republic, Transbaikalia (Zabaykalye), Eastern-Siberian Region, Russia Greenish-grey and yellowish transparent crystals of tornebohmite-(Ce) on boundary of ferriallanite and tornebohmite zones of the vein. Black rounded grains are ferriallanite-(Ce) compositionaly close to the end member. Black tabular blade-like crystals are new unnamed phase with composition ... |
| © Pavel M. Kartashov | Photo ID: 73134 View Count: 334 |
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Biraya Fe-REE ore occurrence, Biraya and Bya Rivers confluence area (Chara Basin), Vitim Plateau, Buriatia (Buryatia) Republic, Transbaikalia (Zabaykalye), Eastern-Siberian Region, Russia Inclusions of greyish-green isometric crystals of Törnebohmite-(Ce) in central zone of carbonatite veinlet. Associating minerals are black coarse-granular Ferriallanite-(Ce), minor black plates of Unnamed O- and Fe-analogue of Västmanlandite-(Ce), brownish rounded masses of Biraite-(Ce), and rockforming carbonates - Strontianite and srontian ... |
| © Pavel M. Kartashov | Photo ID: 248663 View Count: 25 |
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Biraya Fe-REE ore occurrence, Biraya and Bya Rivers confluence area (Chara Basin), Vitim Plateau, Buriatia (Buryatia) Republic, Transbaikalia (Zabaykalye), Eastern-Siberian Region, Russia About 1 cm vide grey layer in the lower part of the specimen is rich impregnated by black plates of Unnamed O- and Fe-analogue of Västmanlandite-(Ce) with composition Ca1(REE2.83Sr.12Ca0.01)2.96(Fe1.53Mg0.47)2.00(Al1.77Fe0.32)2.09Si5.00O20(OH)2. It is located between thin outer Ferriallanite-(Ce) and thick inner Törnebohmite-(Ce) zone of the ... |
| © Pavel M. Kartashov | Photo ID: 248684 View Count: 43 |
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