File:Astrophyllitic agpaite (pegmatitic peralkaline nepheline syenite with astrophyllite) (Khibina Massif, Late Devonian, 362-365 Ma; Kola Peninsula, far-nw Russia) 1 (15024859092).jpg
![File:Astrophyllitic agpaite (pegmatitic peralkaline nepheline syenite with astrophyllite) (Khibina Massif, Late Devonian, 362-365 Ma; Kola Peninsula, far-nw Russia) 1 (15024859092).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/6/61/Astrophyllitic_agpaite_%28pegmatitic_peralkaline_nepheline_syenite_with_astrophyllite%29_%28Khibina_Massif%2C_Late_Devonian%2C_362-365_Ma%3B_Kola_Peninsula%2C_far-nw_Russia%29_1_%2815024859092%29.jpg/800px-thumbnail.jpg?20191207185341)
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editDescriptionAstrophyllitic agpaite (pegmatitic peralkaline nepheline syenite with astrophyllite) (Khibina Massif, Late Devonian, 362-365 Ma; Kola Peninsula, far-nw Russia) 1 (15024859092).jpg |
Astrophyllitic agpaite (peralkaline nepheline syenite with astrophyllite) from the Devonian of Russia (8.7 cm across at its widest) Whitish/grayish = nepheline Greenish-black = aegirine pyroxene Dirty red = eudialyte Golden brown/dark brown = astrophyllite. Far-northwestern Russia’s Kola Peninsula is famous for an abundance of unusual rocks and rare minerals. This area contains the Khibina Massif, a large alkaline igneous pluton intruded into Precambrian basement rocks of the Fennoscandian Shield/Baltic Shield. The intrusion took place during the Caledonian Orogeny - its rocks date to the Late Devonian (~362-365 million years old). The rock shown above is a pegmatitic agpaite (= pegmatitic peralkaline nepheline syenite) with a large, radiating cluster of intensely lustrous, golden-brown astrophyllite blades. Astrophyllite is a rare mineral having the formula (K,Na)3(Fe,Mn)7Ti2(SiO3)8(O,OH)7 - potassium sodium iron manganese titanium hydroxy-oxysilicate. Geologic unit: Khibina Massif, Late Devonian, ~362-365 Ma Locality: unrecorded site in the Kola Peninsula, Murmansk Region, far-northwestern Russia |
Date | |
Source | Astrophyllitic agpaite (pegmatitic peralkaline nepheline syenite with astrophyllite) (Khibina Massif, Late Devonian, 362-365 Ma; Kola Peninsula, far-nw Russia) 1 |
Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/15024859092 (archive). It was reviewed on 7 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
7 December 2019
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current | 18:53, 7 December 2019 | ![]() | 3,008 × 2,000 (2.72 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Orientation | Normal |
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Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 17:58, 26 July 2007 |
Color space | Uncalibrated |
Image width | 3,008 px |
Image height | 2,000 px |
Date and time of digitizing | 13:58, 26 July 2007 |
Date metadata was last modified | 13:58, 26 July 2007 |