Madura Gold Granite
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Synonyms: Giallo Madura, Giallo Madura Gold, Madurai, Madurai Gold, Madurei Gold
Location: Madura Gold granite is quarried near Madurai, Karaikudi Highway in Tamilnadu, South India.
Description: Madura Gold granite is a yellowish gneiss with some dark brown-red garnets. 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 gneiss. Ideal for both interior and exterior use, Madura Gold granite is frost free and polish constant. The veining and colour varies considerably and a small sample is not representative of the whole slab.
Technical and Physical Characteristics:
Compression tensile strength: 1578 kg/cm2
Tensile strength after freeze-thaw cycles: 1599 kg/cm2
Unitary modulus of bending tensile strength: 104 kg/cm2
Heat expansion coefficient: 0.0013 mm/m°C
Water imbibition coefficient: 0.003800
Impact strength: 41 cm
Mass by unit of volume: 2682 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.