Belfast Black Granite From South Africa
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Description: Belfast Black granite is a fine-grained, black gabbro/norite of the Precambrian period. 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 gabbro. 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. Belfast Black 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: Belfast Black 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 not be used on Belfast Black granite and excessive attempts at sealing it could actually create a residue film build-up.
Block Sizes: These are quarries 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: Belfast Black granite is quarried near Wapadskloof, Belfast, Mpumalanga, South Africa, and this is most probably the first granite referred to as Nero Assoluto by the Italian stone industry. Known to have been exported since 1962.
Synonyms: Absolute Black, Afrika Schwarz, Belfast, Negro Belfast, Nero Assoluto, Nero Assoluto Belfast, Nero Assoluto Dunkel, SSY, SSY Granit.
Gabbro: Any of several medium or coarse-grained intrusive igneous rocks that consist primarily of plagioclase feldspar and pyroxene. Essentially, gabbro is the intrusive (plutonic) equivalent of basalt, but whereas basalt is often remarkably homogeneous in mineralogy and composition, gabbros are exceedingly variable. Gabbros are found widely on the Earth and on the Moon as well.
Norite: A mafic intrusive igneous rock composed largely of the calcium-rich plagioclase labradorite and hypersthene with olivine. Norite is essentially indistinguishable from gabbro without thin section study under the petrographic microscope. The principal difference between norite and gabbro, however, is the type of pyroxene of which it is composed; norite is predominately composed of orthopyroxenes, largely high magnesian enstatites, whereas the principal pyroxenes in gabbro are clinopyroxenes, generally medially iron-rich augites.
Mineral Composition: Average by %
Bulk density: 2.94 - 3.00 kg/dm3
Bending strength: 24.52 - 33.6 N/mm2
Compression breaking load: 264.5 - 312.8 N/mm2
Water absorption: 0.15 weight-%
Hardness (Moh's Scale):
Note: These figures and details are given for guidance purposes only, no reliance should be taken as to their accuracy.