Serizzo Formazza Granite
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Synonyms: Sarizzo Formazza, Sarizzo Scuro
Location: Serizzo Formazzo granite is quarried near Formazza, Premia, Provincia di Verbano-Cusio-Ossola, Piemonte, Italy, near the border to Switzerland.
Description: Serizzo Formazzo granite is a medium-grained, black-white 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.
The veining and colour varies considerably and a small sample of Serizzo Formazzo granite may not be representative of the whole slab therefore 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, Serizzo Formazzo granite is frost free and polish constant.
Mineral Composition: Quartz: 30%, Plagioclase: 30%, Orthoclase: 25%, Biotite: 10%, Muscovite: 3%, Accessories: 2%
Technical and Physical Characteristics:
Compression tensile strength: 1690 kg/cm2
Tensile strength after freeze-thaw cycles: 1610 kg/cm2
Unitary modulus of bending tensile strength: 115 kg/cm2
Heat expansion coefficient: 0.0061 mm/m°C
Water imbibition coefficient: 0.033200
Impact strength: 86 cm
Mass by unit of volume: 2678 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.