Beola Grigia Granite
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Synonyms: Beola Grigia Crevoladossola, Beola Grigia dell'Ossola, Beola Grigio, Grigio Beola
Location: Beola Grigia granite is quarried near Beura, Domodossola, Trontano, Villadossola, Val d'Ossola, Provincia di Verbano-Cusio-Ossola, Piemonte, Italy.
Description: Beola Grigia granite is a grey gneiss (paragneiss) of Paleozoic age. Muscovite and biotite cloudly distributed in a light groundmass. Beola Grigia is the most manufactured beola-type paragneiss. 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.
A small sample of Beola Grigia 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, Beola Grigia granite is frost free and polish constant.
Mineral Composition: Quartz: 30%, Plagioclase: 13%, Orthoclase: 40%, Biotite: 10%, Muscovite: 5%, Accessories: 2%
Compression tensile strength: 1725 kg/cm2
Tensile strength after freeze-thaw cycles: 1670 kg/cm2
Unitary modulus of bending tensile strength: 141 kg/cm2
Heat expansion coefficient: 0,0052 mm/m°C
Water imbibition coefficient: 0,003400
Impact strength: 84 cm
Mass by unit of volume: 26740 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.