Marron Cafe Bahia Granite
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Synonyms: Brown Labrador Cafe Granite, Cafa Labrador, Granito Marrom Labrador Cafe, Labrador Marron, Marron Cafe
Location: Marron Cafe Bahia granite is quarried near Santa Rita de Caldas, Minas Gerais, Brazil.
Description: Marron Cafe Bahia granite is a coarse-grained, brown syenite of the Precambrian period. 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 syenite. Ideal for both interior and exterior use, Marron Cafe Bahia granite is frost free and polish constant.
Mineral Composition: Orthoclase: 62%, Quartz: 27%, Hornblende: 5%, Biotite: 3%, Plagioclase: 2%, Mafite: 1%.
Technical and Physical Characteristics:
Compression tensile strength: 2326 kg/cm2
Tensile strength after freeze-thaw cycles: 2181 kg/cm2
Unitary modulus of bending tensile strength: 143 kg/cm2
Heat expansion coefficient: 0.0050 mm/m°C
Water imbibition coefficient: 0.001300
Impact strength: 72.50 cm
Frictional wear: 1.80 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%.