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Keiviite-(Y) : (Y,Yb)2[Si2O7] | |
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Ivedal, Iveland, Aust-Agder, Norway Metamict brownish keiviite-(Y). Size of specimen shown: 3,5 cm x 2 cm Photo & collection: Atle Michalsen |
| © A. Michalsen | Photo ID: 256734 View Count: 47 |
Keiviite-(Y) : (Y,Yb)2[Si2O7], Fluorite (Var: Yttrofluorite) : (Ca1-xYx)F2+x where 0.05< x <0.3 | |
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Stetind, Tysfjord, Nordland, Norway A 0,7 mm white, prismatic keiviite-(Y) crystal in vuggy yttrofluorite. The specimen was collected by Tomas Husdal, and it is now in the micromount collection of OT. Ljostad. |
| © OT. Ljostad | Photo ID: 78478 View Count: 446 |
Keiviite-(Y) : (Y,Yb)2[Si2O7] | |
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Stetind, Tysfjord, Nordland, Norway dimension area mm. 2 x 2 photo and collection Luigi Chiappino |
| © luigi chiappino | Photo ID: 229755 View Count: 43 |
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Ploskaya Mt, Western Keivy Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia Typical appearance of keiviite-(Y) at the locality. It grows in thin veinlets of later light-violet to colourless yttrofluorite-III (with only ~1-2 % of Y) in amazonite blocks. Keiviite-(Y) forms tabular creamy-white crystals up to 1-2 mm in such veinlets. FOV is 1.5x1.2 cm. Selfcollected in September 1990. Pavel M. Kartashov collection and photo. |
| © Pavel M. Kartashov | Photo ID: 71476 View Count: 453 |
Keiviite-(Y) : (Y,Yb)2[Si2O7], Monazite-(Ce) : (Ce,La,Nd,Th)PO4 | |
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Ploskaya Mt, Western Keivy Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia White 0.8 mm segregation of keiviite-(Y) tabular crystals in later monazite-hydromica veinlet within massive amazonite. Keiviite-(Y) in difference from Keiviite-(Yb) grow only in later veinlets of light-violet yttrofluorite-III or such type hidromica one. Keiviite-(Yb) is much more abundant at the locality and form minute impregnation in violet ... |
| © Pavel M. Kartashov | Photo ID: 70437 View Count: 272 |
Keiviite-(Y) : (Y,Yb)2[Si2O7], Thalénite-(Y) : Y3Si3O10(OH) | |
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Åskagen (Torskebäcken), Filipstad, Värmland, Sweden ~2x1 mm white grain of keiviite-(Y) in grey massive thalenite-(Y). Keiviite composition is (Y1.67Yb.21Dy.04Er.03Gd.02Tm.02)1.996[Si2.004O7]. Specimen was collected before 2005. Pavel M. Kartashov collection, analysis and photo. |
| © Pavel M. Kartashov | Photo ID: 70551 View Count: 303 |
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Åskagen (Torskebäcken), Filipstad, Värmland, Sweden Yttrium minerals assemblage of pegmatitic origin: flesh-coloured massive yttrium silicate-carbonate, iimoriite-(Y), with white specks of yttrium ytterbium disilicate, keiviite-(Y) and black ingrown allanite-(Y). Field of view is a bit over 1 cm. Specimen obtained from Sonke Stolze - thanks! |
| © Ł Kruszewski 08 | Photo ID: 147398 View Count: 124 |
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