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β-Fergusonite-(Y) : YNbO4 | |
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Neprimetnyi pegmatite, Mount Ulyn Khuren, Khaldzan Buragtag Massif, Altai Mts, Hovd Aimag (Khovd Aimag), Mongolia Brown agregate of tabular fergusonite-beta-(Y) crystals associated with orange zircon, black ferriallanite-(Ce) and quartz into apoeudialyte pseudomorphose. FOV 10x8 mm. Note special nontetragonal and nonbipyramidal morphology of xls and theyr "dry" lustre so characteristic for nonmetamict niobates. X-ray identification of not heated specimen. ... |
| © Pavel M. Kartashov | Photo ID: 72306 View Count: 323 |
β-Fergusonite-(Y) : YNbO4 | |
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Neprimetnyi pegmatite, Mount Ulyn Khuren, Khaldzan Buragtag Massif, Altai Mts, Hovd Aimag (Khovd Aimag), Mongolia Parallel agregates of brown tabular fergusonite-beta-(Y) crystals associating with black ferriallanite-(Ce) and orange zircon into apoeudyalite pseudomorphose. FOV 4x3 mm. Note special nontetragonal and nonbipyramidal morphology of xls and theyr "dry" lustre so characteristic for nonmetamict niobates. X-ray identification of not heated specimen. ... |
| © Pavel M. Kartashov | Photo ID: 72307 View Count: 294 |
Ferriallanite-(Ce) : {CaCe}{Fe3+AlFe2+}[O|OH|SiO4|Si2O7], Kainosite-(Y) : Ca2(Y,Ce)2Si4O12CO3·H2O | |
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Neprimetnyi pegmatite, Mount Ulyn Khuren, Khaldzan Buragtag Massif, Altai Mts, Hovd Aimag (Khovd Aimag), Mongolia Short prismatic black crystals of ferriallanite-(Ce) 2 mm size in white slightly weathered kainosite-(Y). Orange prismes are zircon of the first generation. Fragment of the holotype specimen. Pavel M. Kartashov collection and photo. |
| © Pavel M. Kartashov | Photo ID: 72305 View Count: 456 |
Ferriallanite-(Ce) : {CaCe}{Fe3+AlFe2+}[O|OH|SiO4|Si2O7], Kainosite-(Y) : Ca2(Y,Ce)2Si4O12CO3·H2O | |
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Neprimetnyi pegmatite, Mount Ulyn Khuren, Khaldzan Buragtag Massif, Altai Mts, Hovd Aimag (Khovd Aimag), Mongolia Holotype specimen of ferriallanite-(Ce) 14x9x3 cm size. Structure of broken apoeudyalite pseudomorphoses is well visible. Black grains are ferriallanite, yellowish prismes - zircon-I, greyish material - quartz, white spots - kainosite-(Y). Large black grain on upper part of the specimen - yttrian ilvaite (up to 8 % Y2O3). This ferriallanite-(Ce) ... |
| © Pavel M. Kartashov | Photo ID: 70383 View Count: 314 |
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