Brown Pearl Granite
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Synonyms: Cafe Imperiale, Caffe Imperiale, Coffee Imperial, Imperial Coffee
Location: Brown Pearl granite is quarried at Sitio Pasto Velho, Bocaina, Estrada Municipal Pocinhos do rio Verde, Ibitura, Caldas, Minas Gerais, Brazil.
Description: Brown Pearl granite is a medium-grained, dark brown syenite. 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 Brown Pearl 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, Brown Pearl granite is frost free and polish constant.
Mineral Composition: Microperthitic Alcaline Feldspar: 77%, Pyroxene: 15%, Biotite: 3%, Accessories: 5%
Technical and Physical Characteristics:
Compression tensile strength: 1570 kg/cm2
Tensile strength after freeze-thaw cycles: 1465 kg/cm2
Unitary modulus of bending tensile strength: 53 kg/cm2
Heat expansion coefficient: 0.0040 mm/m°C
Water imbibition coefficient: 0.001200
Impact strength: 58 cm
Frictional wear: 0.70 mm
Mass by unit of volume: 2540 kg/m3
Syenite: A coarse-grained intrusive igneous rock of the same general composition as granite but with the quartz either absent or present in relatively small amounts (<5%). The feldspar component of syenite is predominantly alkaline in character (usually orthoclase). Plagioclase feldspars may be present in small quantities, less than 10%.