Larvikite

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Larvikite
alkali feldspar, amphibole
A larvikite quarry in Larvik, Norway, 2008
labradorescence
, is a popular decorative stone.
Light larvikite with a polished surface

Larvikite is an

labradorescence) on polished surfaces. Olivine can be present along with apatite, and locally quartz. Larvikite is usually rich in titanium, with titanaugite and/or titanomagnetite
present.

Larvikite occurs in the Larvik

Oslo Rift (Oslo Graben) surrounded by ~1.1 billion year old Sveconorwegian gneisses. The Larvik Batholith is of Permian age, about 292–298 million years old.[2] Larvikite is also found in the Killala Lake Alkalic Rock Complex near Thunder Bay in Ontario, Canada.[3]

The name originates from the town of Larvik in Norway, where this type of igneous rock is found. Many quarries exploit larvikite in the vicinity of Larvik.

Formation

Intrusions of larvikite in Norway form part of the suite of

period, associated with the formation of the Oslo Rift. The crystallisation of a ternary feldspar indicates that this rock began to crystallise under lower crustal conditions.[1]

Uses

Larvikite is prized for its high polish and the labradorescence of its feldspar crystals, and is used as dimension stone, often cladding the facades of commercial buildings and corporate headquarters.[1] It is known informally as Blue Pearl Granite, although this is not an accurate description. Larvikite has been designated by the International Union of Geological Sciences as a Global Heritage Stone Resource.[4]

References

  1. ^
    ISBN 978-82-92-39442-7
    .
  2. ^ Larvikite geology
  3. ISBN 0-7729-0580-0
    .
  4. ^ "Designation of GHSR". IUGS Subcommission: Heritage Stones. Retrieved 24 February 2019.

External links

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