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Aeschynite-(Y) : (Y,Ca,Fe,Th)(Ti,Nb)2(O,OH)6 | |
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West Keivy Block, Western Keivy Massif, Kola peninsula, Murmanskaja Oblast', Northern Region, Russia Prismatic crystals of aeschynite-(Y) (variety blomstrandine) in alkaline granite pegmatite matrix. Associated minerals are quartz, aegirine, britholite-(Y), zircon. Specimen size is 5.5x4x3 cm and its radioactivity from different sides 600-800 μR/h. Collected by M. Torokhov. Platon Mt., Western Keivy. Pavel M. Kartashov collection and photo. |
| © Pavel M. Kartashov | Photo ID: 72817 View Count: 370 |
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West Keivy Block, Western Keivy Massif, Kola peninsula, Murmanskaja Oblast', Northern Region, Russia Sprays of astrophyllite with large plate crystals of black ilmenite in alkaline granite pegmatite. This astrophyllite is very similar to hydroastrophyllite from Southern boundary of the massif, but unfortunately it has quite usual full-K composition. Specimen size is 8x5x3 cm. Collected by Victor Levitskii in 2004 near Rova river. Pavel M. ... |
| © Pavel M. Kartashov | Photo ID: 144392 View Count: 144 |
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West Keivy Block, Western Keivy Massif, Kola peninsula, Murmanskaja Oblast', Northern Region, Russia Bronze crystaline masses of astrophyllite in quartz matrix. Specimen size is 5x4.5x3.5 cm. Collected by Mikhail Torokhov in 1990. Pavel M. Kartashov collection and photo. |
| © Pavel M. Kartashov | Photo ID: 149008 View Count: 67 |
Astrophyllite : (K,Na)3(Fe,Mn)7Ti2Si8O24(O,OH)7, Quartz : SiO2 | |
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West Keivy Block, Western Keivy Massif, Kola peninsula, Murmanskaja Oblast', Northern Region, Russia Bronze crystaline masses of astrophyllite in quartz matrix. I am remember, how I was surprised by this association, when similar specimens had appear in Moscow in the middle of 80th. Of course now I am understand, that alkalinity is independent of silica content in the rock, and presence or absence of astrophyllite in a alkaline granite ruled by ... |
| © Pavel M. Kartashov | Photo ID: 149016 View Count: 67 |
Britholite-(Y) : Ca2(Y,Ca)3[(OH,F)|(SiO4,PO4)3], Bastnäsite-(Ce) : (Ce,La)[F|CO3], Tengerite-(Y) : Y2[CO3]3 · 2-3H2O | |
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West Keivy Block, Western Keivy Massif, Kola peninsula, Murmanskaja Oblast', Northern Region, Russia Britholite-(Y) brown glassy grains in quartz matrix with minor black magnetite. This britholite is Y-dominant, but REE spectrum displased to the left side with the maximum on Ce. So the main alteration product of this britholite-(Y) is bastnasite-(Ce) - its yellow masses are well visible at right part of specimen. Minute snow-white films of ... |
| © Pavel M. Kartashov | Photo ID: 72815 View Count: 355 |
Britholite-(Y) : Ca2(Y,Ca)3[(OH,F)|(SiO4,PO4)3] | |
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West Keivy Block, Western Keivy Massif, Kola peninsula, Murmanskaja Oblast', Northern Region, Russia Specimen is 5 mm long. |
| © Sergey Vasiliev | Photo ID: 71467 View Count: 390 |
Britholite-(Y) : Ca2(Y,Ca)3[(OH,F)|(SiO4,PO4)3], Tengerite-(Y) : Y2[CO3]3 · 2-3H2O | |
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West Keivy Block, Western Keivy Massif, Kola peninsula, Murmanskaja Oblast', Northern Region, Russia Brown cm-size britholite-(Y) grains with typical "apatite" sections in quartz matrix with black magnetite. Tengerite-(Y) form white films in upper right part of the photo. FOV ~3.5x3.5 cm. Pavel M. Kartashov collection and photo. |
| © Pavel M. Kartashov | Photo ID: 72816 View Count: 251 |
Tveitite-(Y) : (Y, Na)6Ca6Ca6F42 | |
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West Keivy Block, Western Keivy Massif, Kola peninsula, Murmanskaja Oblast', Northern Region, Russia 2.5x2 cm monograin fragment of pinksh tveitite-(Y) from pegmatite of alkaline granites. Microprobe and PXRD confirmed. Mineral has distinct yellow SW UV fluorescention. Collected by Igor V. Pekov in 2006 on Rovgora Mt. This material described in the article Pekov I.V. e.a. (2008): Tveitite-(Y) and rare-earth enriched fluorite from amazonite ... |
| © Pavel M. Kartashov | Photo ID: 150786 View Count: 150 |
Tveitite-(Y) : (Y, Na)6Ca6Ca6F42 | |
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West Keivy Block, Western Keivy Massif, Kola peninsula, Murmanskaja Oblast', Northern Region, Russia 2.5x2 cm monograin fragment of pinksh tveitite-(Y) from pegmatite of alkaline granites. Microprobe and PXRD confirmed. Mineral has distinct yellow SW UV fluorescention. Collected by Igor V. Pekov in 2006 on Rovgora Mt. This material described in the article Pekov I.V. e.a. (2008): Tveitite-(Y) and rare-earth enriched fluorite from amazonite ... |
| © Pavel M. Kartashov | Photo ID: 150784 View Count: 119 |
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