Angola Black Granite From Angola
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Description: Angola Black Granite is a coarse-grained, dark blue/black anorthosite 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 an anorthosite. 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. Angola 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: Angola 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 be used on Angola Black 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: Angola Black granite is quarried near Sa da Bandeira, Lubango, Angola.
Synonyms: Angola, Black Angola, Lapis Black, Labrador Black, Negro Angola, Negro de Angola, Nero Angola, Preto Angola
Anorthosite: A phaneritic, intrusive igneous rock characterized by a predominance of plagioclase feldspar (90-100%), and a minimal mafic component (0-10%). Pyroxene, ilmenite, magnetite, and olivine are the mafic minerals most commonly present.
Mineral Composition: Average by %
Compression Tensile Strength: 2080 kg/cm2
Tensile Strength After Freeze-Thaw Cycles: 1990 kg/cm2
Unitary Modulus Of Bending Tensile Strength: 132 kg/cm2
Heat Expansion Coefficient: 0.0065 mm/m°C
Water Imbibition Coefficient: 0.004000
Heat Expansion Rate: 0,0062 mm/m°C
Mass By Unit Of Volume: 2620 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.