File:Astrophyllitic agpaite (peralkaline nepheline syenite with astrophyllite) (Khibina Massif, Late Devonian, 362-365 Ma; Kola Peninsula, far-nw Russia) 2 (27801919972).jpg

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Astrophyllitic agpaite (peralkaline nepheline syenite with astrophyllite) from the Devonian of Russia. (centimeter scale)

Dark brown & golden-brown = astrophyllite. ~Reddish = eudialyte Whitish/grayish = nepheline

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 part of a large, radiating cluster of intensely lustrous, dark brown to 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
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Source Astrophyllitic agpaite (peralkaline nepheline syenite with astrophyllite) (Khibina Massif, Late Devonian, 362-365 Ma; Kola Peninsula, far-nw Russia) 2
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@N05/27801919972 (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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Date/TimeThumbnailDimensionsUserComment
current18:58, 7 December 2019Thumbnail for version as of 18:58, 7 December 20192,379 × 1,895 (3.4 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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