Giallo Duna Granite
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Synonyms: Duna Gelb, Duna Giallo, Duna Gold
Location: Giallo Duna granite is quarried near Walvis Bay, Namibia.
Description: Giallo Duna granite is a medium-grained, yellow-brown aplite. 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 an aplite.
A small sample of Giallo Duna 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, Giallo Duna granite is frost free and polish constant.
Technical and Physical Characteristics:
Compression tensile strength: 1514 kg/cm2
Tensile strength after freeze-thaw cycles: 1450 kg/cm2
Unitary modulus of bending tensile strength: 93 kg/cm2
Heat expansion coefficient: 0.0076 mm/m°C
Water imbibition coefficient: 0.001800
Mass by unit of volume: 2566 kg/m3
Aplite: The name given to intrusive rock whereby the essential components of aplites are quartz and alkali feldspar (the latter usually orthoclase or microperthite), microcline and albite. Crystallization has been apparently rapid (as the rocks are so fine-grained), and the ingredients have solidified almost at the same time. Hence their crystals are rather imperfect and fit closely to one another in a sort of fine mosaic of nearly equi-dimensional grains. Porphyritic feldspars occur occasionally and quartz more seldom; but the relation of the aplites to quartz-porphyries, granophyres and felsites is very close, as all these rocks have nearly the same chemical composition.