Colombo Gold Granite
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Synonyms: Juparana Colombo Gold
Location: Colombo Gold granite is quarried in India.
Description: Colombo Gold granite is a strong banded, fine to coarse-grained, yellow-brown gneiss. 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 gneiss.
The veining and colour varies considerably and a small sample of Colombo Gold granite may not be representative of the whole slab therefore 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, Colombo Gold granite is frost free and polish constant.
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.