File:Blue Pearl Granite (larvikite) Larvik Batholith Norway.jpg

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Larvikite (“Blue Pearl Granite”) from the Larvik Batholith (Early Permian) near Larvik, southern Norway.

Larvikite is one of my favorite rocks. It’s a variety of monzonite, though it’s sometimes misperceived as a variety of syenite. Larvikite is dominated by large crystals of spectacularly bluish-iridescent (schillerescent) perthitic feldspar (closely intergrown potassium feldspar and plagioclase feldspar). The play of colors is the result of light being dispersed along the plagioclase and K-feldspar crystal boundaries. The smaller black crystals are pyroxene.

Varieties of larvikite are popular decorative/ornamental stones known commercially as “Blue Pearl Granite”, “Emerald Pearl Granite”, and other names. They are quarried from the Larvik Batholith (a.k.a. Larvik Pluton, Larvik Complex, Larvik Plutonic Complex), a suite of 10 igneous plutons emplaced in the Oslo Rift (Oslo Graben) surrounded by ~1.1 billion year old Sveconorwegian gneisses. The Larvik Batholith dates to about 292-298 million years old (early Early Permian). Many quarries exploit larvikite in the vicinity of the town of Larvik in southwestern Vestfold County, southern Norway.
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Source Blue Pearl Granite (larvikite, Larvik Batholith, 292-298 Ma, Early Permian; near Larvik, southern Norway)
Author James St. John

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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/14620330099. It was reviewed on 4 August 2014 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

4 August 2014

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current03:19, 4 August 2014Thumbnail for version as of 03:19, 4 August 2014938 × 778 (342 KB)Tillman (talk | contribs)Transferred from Flickr via Flickr2commons

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