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Davidite-(La) : (La,Ce)(Y,U,Fe)(Ti,Fe)20(O,OH)38 | |
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Beqtau-Ata (Bektau-Ata), Qaraghandy Oblysy (Karaganda Oblast'), Kazakhstan Large twinned tabular crystal of davidite-(La) from granite pegmatite. Davidite is associated with pink microcline and red albite. Specimen size is 7x5x3.5 cm and its radioactivity is 400 μR/h. Collected by Leonid A. Pautov in the end of 70th. Pavel M. Kartashov collection and photo. |
| © Pavel M. Kartashov | Photo ID: 72571 View Count: 381 |
Davidite-(La) : (La,Ce)(Y,U,Fe)(Ti,Fe)20(O,OH)38 | |
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Beqtau-Ata (Bektau-Ata), Qaraghandy Oblysy (Karaganda Oblast'), Kazakhstan This rare earth crystal is characterized by brilliant metallic luster along with a silver-black color. Although slightly rough around the perifera, it is nevertheless complete and VERY large for the species. Slightly radioactive. A rare mineral indeed! 3.6 x 3.5 x 1 cm |
| © Rob Lavinsky | Photo ID: 35242 View Count: 480 |
Davidite-(La) : (La,Ce)(Y,U,Fe)(Ti,Fe)20(O,OH)38 | |
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Beqtau-Ata (Bektau-Ata), Qaraghandy Oblysy (Karaganda Oblast'), Kazakhstan Crystal with 1,5x1x0,7cm - December of 2002 |
| © Martins da Pedra | Photo ID: 43305 View Count: 368 |
Davidite-(La) : (La,Ce)(Y,U,Fe)(Ti,Fe)20(O,OH)38 | |
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Beqtau-Ata (Bektau-Ata), Qaraghandy Oblysy (Karaganda Oblast'), Kazakhstan Dark brown, barrel-shaped crystal of Davidite-(La). Size 1,5 x 1,6 cm. |
| © Peter Kohorst | Photo ID: 55146 View Count: 320 |
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Beqtau-Ata (Bektau-Ata), Qaraghandy Oblysy (Karaganda Oblast'), Kazakhstan 40 x 40 x 7 mm. 33.5 grams. Ex: Herbert Obodda Specimen, Lawrence Conklin Personal Collection, Robert J. Nowakowski Collection. |
| © Joseph A. Freilich | Photo ID: 194853 View Count: 168 |
Scheelite : Ca[WO4] | |
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Beqtau-Ata (Bektau-Ata), Qaraghandy Oblysy (Karaganda Oblast'), Kazakhstan Scheelite crystal 4x3x3 cm from cavity with optical quartz in granite pegmatite. It had grow so slowly and in such quite conditions, that its crystalline structure hasn't any defects. So this crystal don't fluorescent under any UV. But under laser stimulation it gave to us spectrum of luminescention of HREE. Collected in early 60th. Pavel M. ... |
| © Pavel M. Kartashov | Photo ID: 72577 View Count: 207 |
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