Tolga (natural stone)

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Tolga ( called Tolga White in export ) is a Norwegian rock , a Trondhjemit , which is mined near the town of Tolga . It originated in the Silurian Mountains 430 million years ago .

Geology and occurrence

Trondhjemites are formed with tonalites and granodiorites when basaltic crusts melt in subduction zones . Trondhjemite usually occur in a metamorphic form.

The Tolga deposit is located in the north of the village of Tolga and other Trondjemite deposits are located between the Trondheimsfjord and Österdal .

Rock description and mineral inventory

Tolga is a very light rock due to the high proportion of plagioclase around 59% . Tolga contains 29% quartz, 3% biotite , 4% epidote and 0.5% titanite . Biotite is distributed relatively evenly and gives the rock a uniformly grained structure. This natural stone does not contain any potassium feldspar .

use

Tolga was exported to Germany and also to Europe and overseas from the 1970s.

This natural stone is mainly used in construction, in exterior architecture as facade panels and in interior design in bathrooms as a washstand and in kitchens as worktops and for floor and stair coverings. Because of its properties, it is well suited for tombs and is also used in gardening, landscaping and masonry.

Tolga is frost-resistant and can be polished. In terms of its technical properties, it is similar to granites .

literature

  • Friedrich Müller : INSK compact. The international natural stone index for the current market . Ebner Verlag, Ulm 1977

Web links

  • scanaia.com : Vietnamese Artisans to Build Stone Bridge in Norway (bridge construction in Norway with Tolga and a red granite from Da Nang) (English)
  • natursteinonline.de : Picture by Tolga

Individual evidence

  1. ↑ a b c geologi.no  ( page no longer available , search in web archives )  Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice. : Odd Nilsen, Fernando Corfu & David Roberts: Silurian gabbro-diorite-trondhjemite plutons in the Trondheim Nappe Complex, Caledonides, Norway: petrology and U-Pb geochronology , in English, accessed May 29, 2011@1@ 2Template: Dead Link / www.geologi.no  
  2. ↑ folk.ntnu.no : Trondhjemite, in English, accessed on May 29, 2011

Coordinates: 62 ° 24 ′ 48.2 "  N , 11 ° 1 ′ 12.7"  E