Giallo Duna Granite From Namibia
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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. The veining and colour varies and a small sample of Giallo Duna 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. During the polishing process a clear epoxy resin filler may be used to fill any micro fissures or tiny pitting however this does not affect the integrity of the stone, it merely provides an even smoother surface finish. Giallo Duna Granite is suitable for both interior and exterior use futhermore is frost resistant and with a constant polish.
Products: Suitable for construction projects both commercial and domestic, prefabricated countertops/worktops, vanities, tiles, backsplashes, paving, fireplaces and memorials.
Surface Finish: Giallo Duna Granite looks best with a gloss polished surface but is also available as honed, leather/satin, river-washed/antique, thermal/flamed, brushed and sandblast finish.
Sealing: Test with a small sample. It is possible that a sealant can be used on Giallo Duna granite however excessive attempts at sealing it could actually create a residue film build-up.
Block Sizes: This is a quarry yielding selectable, grades of granite with blocks suitable for gangsaw size down to economical tile-sized blocks. For commercial projects it is important to ensure that blocks are selected from the same quarry face.
Rough blocks are usually exported by Break Bulk however intermodal containerisation is available at extra cost. Finished products are packed into sea-worthy wooden crates and loaded into containers.
Quarry Location: Giallo Duna granite is quarried near Walvis Bay, Namibia. Production about 300 M3 per month.
Synonyms: Duna Gelb, Duna Giallo, Duna Gold
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.
Mineral Composition: Average by %
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
Hardness (Moh's Scale):
Note: These figures and details are given for guidance purposes only, no reliance should be taken as to their accuracy.