Angola Black Granite

Angola Black Granite Image

Description

Angola Black Granite from near Sa da Bandeira, Lubango, Angola, is a coarse-grained, dark blue/black anorthosite of the Precambrian period suitable for granite worktops and tiles, wall cladding and prestigious architectural elements. A small sample of Angola Black 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. 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.

Black Granite Shades

As a generalisation most black granite quarries have varying shades of black. This variation in shading is completely natural and usually occurs with the ground level of the quarry being lighter with the deeper the granite is quarried becoming darker, however some quarries may vary in shade along its length or width. The experienced quarryman knows where the lighter and darker shades are and can supply to the customer's preferences. All of our Indian black granites are from the Deccan Plateau.

NOTE: It is a fact that some unscrupulous dealers will actually dye the lighter shades and try to sell them as the Ultimate Black, Premium Black or Angola Black product at its correspondingly higher price, with totally normal usage these "doctored" blacks will lose their artificially applied darkness. To check for dying try the lemon juice or acetone test. Do ensure that the granite is washed clean before doing this otherwise it may simply be general dirt. Take a clean white rag and apply some lemon juice or acetone to the granite surface. If any residue or black appears on the rag then it has been dyed. Also, if you have several small sample choices, leave a drop of the lemon juice for five minutes on the polished surface, wipe the surface clean and observe the results, once again any dull spot or patch and the material has been doctored.

Needless to say we never use colour enhancers.


To assist all potential black granite purchasers we have produce an Absolute Black Granite Guide.

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, flamed & brushed, water-jet, bush-hammered, sandblast and sawn finish.

Sealing

Test with a small sample. It is most unlikely that a sealant can be used on this granite due to the very tight grain formation, attempts at sealing it could actually create a residue film build-up.

Synonyms

Angola, Black Angola, Lapis Black, Labrador Black, Negro Angola, Negro de Angola, Nero Angola, Preto Angola

Quarry Location

Angola Black granite is quarried near Sa da Bandeira, Lubango, Angola.

Angola Black Granite

Angola Black Granite Sample Image

Granite Slabs

Angola Black granite slabs are available in standard 20mm and 30mm thickness for random slabs, cut-to-size (dimensioned) and prefabricated to the customer's specifications, 40mm thick are produced but are not usually held in stock for immediate despatch.

Standard Slab Sizes
Large Gangsaw(2800mm & above x 1800mm & above)
Medium Gangsaw(2200mm & above x 1200mm & above)
Vertical Cutter(2200mm & above x 600~900mm)

Premium Quality Slab Sizes
When available 3000+mm x 2000+mm

Granite Countertops
Free length or made to your dimensions, standard sizes are
2400~3200 x 600/630/700/900/1000/1200 x 30 mm

Memorial/Monumental Slabs
50mm through to 200mm thick are cut to customer specifications, please Contact Us with the material(s), sizes and finishes you require.

Granite Tiles

Angola Black granite Premium & Commercial quality calibrated, bevelled & grooved matching granite tiles.

Standard Tile Sizes
305 x 305 x 10 mm (12" x 12" x ⅜")
610 x 305 x 10 mm (24" x 12" x ⅜")
400 x 400 x 10 mm (15¾" x 15¾" x ⅜")
457 x 457 x 10/12 mm (18" x 18" x ⅜~½")
610 x 610 x 15/18 mm (24" x 24" x ⅗~¾")

Furthermore 305/400/457/610 mm x Freelength, normally up to 2000mm (78.75") for you to cut to length on site. Longer lengths can easily be produced HOWEVER this could possibly create an on-site handling and cutting production challenge.

As you can see our granite tile production size capabilities are extremely flexible, please Contact Us with the material(s), sizes and finishes you require.

CE Marking Of Natural Stone

Contractors can be responsible for the accuracy of the data, to learn more about this directive please read here.

Technical Specifications

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.

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.

Quarry Blocks

There are several quarries yielding selectable, grades of granite with blocks suitable for gangsaw size down to economical tile-sized and monument blocks. Extraction is beieved to have commenced in the 1970s. For commercial projects it is important to ensure that blocks are selected from the same quarry face, do not try and match-up with alternative black granite sources.

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.

Granite Saws Image
Angola Black  Granite Polished Slab Image
Warehouse Image
Angola Black Granite Rough Blocks Image


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