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Fergusonite-(Ce) : (Ce,La,Nd)NbO4, Fergusonite-(Y) : YNbO4, Polyakovite-(Ce) : (Ce,Ca)4(Mg,Fe2+)(Cr3+,Fe3+)2(Ti,Nb)2[O4|Si2O7]2 | |
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Pit No. 97 (N97 Mine), Ilmen Natural Reserve, Ilmen Mts, Chelyabinsk Oblast', Southern Urals, Urals Region, Russia 1 mm long grain of intimately intergrown fergusonite-(Ce) and -(Y). Both minerals are high enriched with thorium (up to 12.5 % ThO2). Intergrowth into large Polyakovite-(Ce) masses. Pavel M. Kartashov collection (#2103), analyses and photo. |
| © Pavel M. Kartashov | Photo ID: 69997 View Count: 270 |
Polyakovite-(Ce) : (Ce,Ca)4(Mg,Fe2+)(Cr3+,Fe3+)2(Ti,Nb)2[O4|Si2O7]2, Fluororichterite : Na[CaNa][Mg5][(F,OH)2|Si8O22] | |
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Pit No. 97 (N97 Mine), Ilmen Natural Reserve, Ilmen Mts, Chelyabinsk Oblast', Southern Urals, Urals Region, Russia Back side of the largest known polyakovite-(Ce) crystal showing conchoidal surfaces so typical for this mineral. Green fluororichterite owergrowth is well visible. Specimen size is 4.5x3x2.5 cm and its radioactivity 146 μR/h. Collected by Ivan Klochkov in 2003. Pavel M. Kartashov collection (#2103) and photo. |
| © Pavel M. Kartashov | Photo ID: 70004 View Count: 318 |
Polyakovite-(Ce) : (Ce,Ca)4(Mg,Fe2+)(Cr3+,Fe3+)2(Ti,Nb)2[O4|Si2O7]2, Phlogopite : KMg3[(OH,F)2|AlSi3O10], Fluororichterite : Na[CaNa][Mg5][(F,OH)2|Si8O22] | |
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Pit No. 97 (N97 Mine), Ilmen Natural Reserve, Ilmen Mts, Chelyabinsk Oblast', Southern Urals, Urals Region, Russia The largest known up to now polyakovite-(Ce) crystal with termination 4.5x3x2.5 cm size. Associated with phlogopite and fluororichterite, contain inclusions of thorianite and high-thorian fergusonite-(Ce) and -(Y). Collected by I. Klochkov in 2003. Radioactivity 146 μR/h. Pavel M. Kartashov collection (#2103), analyses and photo. |
| © Pavel M. Kartashov | Photo ID: 70003 View Count: 240 |
Polyakovite-(Ce) : (Ce,Ca)4(Mg,Fe2+)(Cr3+,Fe3+)2(Ti,Nb)2[O4|Si2O7]2 | |
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Pit No. 97 (N97 Mine), Ilmen Natural Reserve, Ilmen Mts, Chelyabinsk Oblast', Southern Urals, Urals Region, Russia Termination of short-prismatic polyakovite-(Ce) crystall of 1x3 mm size. Pavel M. Kartashov collection (#2103) and photo. |
| © Pavel M. Kartashov | Photo ID: 70002 View Count: 210 |
Thorianite : ThO2, Polyakovite-(Ce) : (Ce,Ca)4(Mg,Fe2+)(Cr3+,Fe3+)2(Ti,Nb)2[O4|Si2O7]2 | |
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Pit No. 97 (N97 Mine), Ilmen Natural Reserve, Ilmen Mts, Chelyabinsk Oblast', Southern Urals, Urals Region, Russia Small cubic crystal of Thorianite on 1 mm size Polyakovite-(Ce) crystall from the type locality of the later. Pavel M. Kartashov collection (#2103) and photo. |
| © Pavel M. Kartashov | Photo ID: 70001 View Count: 196 |
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