Brown Antique Granite
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Synonyms: Angola Brown, Marrom Antik. Some sources suggest Marron Cohiba however that would appear to be a similar Brazilian granite. Not to be confused with the commercial name for Antique Brown from Finland believed to be no longer quarried.
Location: Brown Antique granite is quarried in Angola
Description: Brown Antique granite is a very coarse-grained, black-brown anorthosite quarried in Angola. This stone internationally may be nominated as a granite however in the area of application of the European Standard this stone must be nominated as an anorthosite. All anorthosites found on Earth consist of coarse crystals.
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: 82 cm
Frictional wear: 0.7 mm
Mass by unit of volume: 2540 kg/m3
Anorthosite: A phaneritic, intrusive igneous rock characterized by a predominance of plagioclase feldspar (90-100%), and a minimal mafic component (0-10%). Pyroxene, ilmenite, magnetite, and olivine are the mafic minerals most commonly present.