Gris Perla Granite
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Synonyms: Granito No. 8, Grey Pearl
Location: Gris Perla granite is quarried near Canlo de Vello, Meis, Pontevedra, Provincia de Pontevedra, Galicia, Spain.
Description: Gris Perla granite is a Commercial name for a medium to coarse-grained, white to light grey granite (granodiorite) of the Carboniferous period, with big white or light grey feldspar crystals. This stone internationally may be nominated as a granite and in the area of application of the European Standard this stone must be nominated as a granite.
A small sample of Gris Perla 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, Gris Perla granite is frost free and polish constant.
Mineral Composition: Quartz, Microcline, Plagioclase, Biotite; Secondary Minerals: Hornblende, Apatite, Zircone, Sericite, Chlorite, Epidote, Mafite
Technical and Physical Characteristics:
Compression tensile strength: 1984 kg/cm2
Tensile strength after freeze-thaw cycles: 1890 kg/cm2
Unitary modulus of bending tensile strength: 115 kg/cm2
Heat expansion coefficient: 0.0068 mm/m°C
Water imbibition coefficient: 0.005800
Impact strength: 72 cm
Mass by unit of volume: 2635 kg/m3
Granite: Granite is a common and widely occurring type of intrusive, felsic, igneous rock. Granites are usually medium to coarse grained, occasionally with some individual crystals larger than the groundmass forming a rock known as porphyry. Granites can be pink to dark grey or even black, depending on their chemistry and mineralogy.
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.