Tolga White Granite
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Synonyms: Tolga, Tolge
Location: Tolga White granite is quarried near Olaberget, Tolga, Hedmark, Norway.
Description: Tolga White granite is a Commercial name for a fine-grained, very light grey granite (granodiorite, trondhjemite) of the Silurian period. This stone internationally may be nominated as a granite but in the area of application of the European Standard this stone must be nominated as a granodiorite.
A small sample of Tolga White granite is usually representative not having a wide variation in colour and veining however swatch samples must be approved for large projects to ensure that the blocks are all extracted from the same quarry face for matching purposes. Ideal for both interior and exterior use, Tolga White granite is frost free and polish constant.
Mineral Composition: White Plagioclase: 55%, Translucent Quartz: 25%, Mafite: 15%, Biotite: 5%
Technical and Physical Characteristics:
Compression tensile strength: 1425 kg/cm2
Unitary modulus of bending tensile strength: 139 kg/cm2
Heat expansion coefficient: 0.0069 mm/m°C
Water imbibition coefficient: 0.002700
Impact strength: 61 cm
Frictional wear: 3.50 mm
Mass by unit of volume: 2603 kg/m3
Granodiorite A medium to coarse-grained rock that is among the most abundant intrusive igneous rocks. It contains quartz and is distinguished from granite by its having more plagioclase feldspar than orthoclase feldspar; its other mineral constituents include hornblende, biotite, and augite. The plagioclase (andesine) usually forms twinned crystals, sometimes wholly encased by orthoclase. The mode of formation and occurrence, physical appearance, and mineralic composition and texture of granodiorite are much like those of granite; granodiorite is darker in colour, however, because of its greater plagioclase content.