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Description: Brazilian Black granite is a medium-grained, dark grey to black diorite of the Precambrian period. This stone internationally may be nominated as a granite and in the area of application of the European Standard this stone must be nominated as a diorite. A small sample of Brazilian 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. Brazilian 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: Brazilian 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 Brazilian 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: Brazilian Black granite is quarried in Brazil.

Synonyms: Nero Brasile, Preto Brasile

Diorite: A medium to coarse-grained intrusive igneous rock that commonly is composed of about two-thirds plagioclase feldspar and one-third dark-coloured minerals such as hornblende or biotite. The presence of sodium-rich feldspar, oligoclase or andesine, in contrast to calcium-rich plagioclase, labradorite or bytownite, is the main distinction between diorite and gabbro.

Mineral Composition: Average by % Plagioclase: 60%, Biotite: 15%, Hypersthene: 15%, Hornblende: 5%, Quartz: 5%

Technical Specifications

Compression Tensile Strength: kg/cm2

Tensile Strength After Freeze-Thaw Cycles: kg/cm2

Unitary Modulus Of Bending Tensile Strength: kg/cm2

Heat Expansion Coefficient: mm/m°C

Water Imbibition Coefficient:

Impact Strength: cm

Frictional Wear: mm

Mass By Unit Of Volume: 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.


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