File:Baltic Brown Granite (rapakivi granite) (wiborgite) (Wiborg Batholith, 1.615-1.645 Ga, Paleoproterozoic; Husu Quarry, Kymi Province, Finland) 2 (25472675572).jpg

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"Baltic Brown Granite" - rapakivi granite from the Precambrian of Finland. (~21.25 cm across)

Baltic Brown Granite is a variety of rapakivi granite called wiborgite, characterized by having large K-feldspar spheroids rimmed (usually) by greenish plagioclase feldspar. Wiborgite is composed of K-feldspar, plagioclase feldspar, quartz, biotite mica, and hornblende amphibole. This rock comes from the Wiborg Batholith (a.k.a. Wiborg Rapakivi Granite Batholith, Wiborg Massif, Vyborg Batholith) in the Baltic Shield (Fennoscandian Shield).

Age: ~1.615 to 1.645 billion years, late Paleoproterozoic

Locality: Husu Quarry, near Ylämaa in southern Kymi Province, southern Finland (Baltic Brown Granite is also produced from the Parkkola Quarry).
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Source Baltic Brown Granite (rapakivi granite) (wiborgite) (Wiborg Batholith, 1.615-1.645 Ga, Paleoproterozoic; Husu Quarry, Kymi Province, Finland) 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@N05/25472675572 (archive). It was reviewed on 22 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

22 October 2019

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current05:53, 22 October 2019Thumbnail for version as of 05:53, 22 October 20195,152 × 4,784 (11.06 MB)Rudolphous (talk | contribs)Transferred from Flickr via #flickr2commons

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