File:Sodalite Blue Granite (sodalite metasomatite) (Swartbooisdrif Sodalite Deposit, Proterozoic; quarry near Swartbooisdrif, Namibia) 1.jpg

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English: "Sodalite Blue Granite" - sodalite metasomatite from the Precambrian of Namibia.

This attractive decorative stone is dominated by the blue-colored mineral sodalite, which is sodium chloro-aluminosilicate, Na4(Al3Si3)O12Cl. Some sources assert that this is a sodalite foidolite, which is a sodalite-rich, feldspathoid-bearing, intrusive igneous rock. In reality, this is a metasomatite - a metamorphic rock formed by intense chemical alteration (von Seckendorff et al., 2000)

The host rocks are anorthosites and troctolites of the Kunene Intrusive Complex (= late Mesoproterozoic, 1.19 Ga). These were intruded afterward by alkaline syenites and carbonatites of the Epembe-Swartbooisdrif Alkaline Province. The carbonatites metasomatized the anorthosites, resulting in sodalite-rich rocks. These sodalite deposits have been extensively mined.

Geologic unit & age: Swartbooisdrif Sodalite Deposit, Proterozoic

Locality: attributed to a quarry near Swartbooisdrif, far-northern Kunene Region, northwestern Namibia (next to the Angola border), southwest Africa

Reference cited:

von Seckendorff et al. (2000) - Oxide-sulphide relationships in sodalite-bearing metasomatites of the Epembe-Swartbooisdrif Alkaline Province, north-west Namibia. Mineralium Deposita 35: 430-450.
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Source https://www.flickr.com/photos/47445767@N05/43481456970/
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@N05/43481456970. It was reviewed on 15 November 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

15 November 2022

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