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Synonyms: Leggiuna, Legiuna, Legiuna-Gneis, Legiuna-Granit, Legiunagranit, Montana, Monte Rosa
Location: Monterosa granite is quarried near Malvaglia, Ticino, European Alps, Switzerland.
Description: Monterosa granite is a very coarse-grained, grey paragneiss, feldspars sized up to 8cm. 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 gneiss. Ideal for both interior and exterior use, Monterosa granite is frost free and polish constant.
Technical and Physical Characteristics:
Compression tensile strength: 1720 kg/cm2
Tensile strength after freeze-thaw cycles: 1664 kg/cm2
Unitary modulus of bending tensile strength: 139 kg/cm2
Heat expansion coefficient: 0.0050 mm/m°C
Water imbibition coefficient: 0.003200
Impact strength: 86 cm
Mass by unit of volume: 2661 kg/m3
Gneiss: A common and widely distributed type of rock formed by high-grade regional metamorphic processes from pre-existing formations that were originally either igneous or sedimentary rocks. Gneissic rocks are usually medium to coarse-foliated and largely recrystallized but do not carry large quantities of micas, chlorite or other platy minerals. Gneisses that are metamorphosed igneous rocks or their equivalent are termed granite gneisses, diorite gneisses, etc.