Blue Pearl Granite (larvikite) Larvik Batholith Norway

Författare/Upphovsman:

James St. John

Tillskrivning:

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Kreditera:

Blue Pearl Granite (larvikite, Larvik Batholith, 292-298 Ma, Early Permian; near Larvik, southern Norway)

Kort länk:

https://sewiki.info/b/97837

Källa:

Wikimedia Commons

Upplösning:

938 x 778 Pixel (349860 Bytes)

Beskrivning:

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

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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.

Licens:

CC BY 2.0

Licensvillkor:

Creative Commons Attribution 2.0