Black Galaxy Granite : Information For Users Worldwide
Black Galaxy granite is undoubtedly one of the world's most popular and successful granites and has been exported to every continent. The quarrying area is Chimakurthi, Ongole, Andhra Pradesh, South India (approx. 350 km north of Chennai) where one would find about 50 Galaxy quarries however not all operate 12 months of the year, more...
It is important to stress that for large projects it is essential to source the Black Galaxy granite from the same quarry supply since mixing background colours will be very noticeable.
Black Galaxy Granite Description
Black Galaxy Granite is a fine to medium-grained, black gabbric anorthosite of the Precambrian period usually with golden-yellow sparkling broncite scales however this will vary depending upon the source quarry. Internationally this stone may be nominated as a granite and for the US and Chinese markets this is correct however in Europe the stone must be nominated as a gabbro because the European Standard EN 12440 (Natural Stone, Denomination Criteria) demands a scientific terminology determined with a petrografic examination according to EN 12407 and 4.2 of prEN 12670.
This material can have a dark black background, a dark black/green tinge or black with grey/white pinhead sized spotting. All will have golden specks in them however there are two distinct types: small/medium flake and large flake (popcorn). There are many different quarries of Black Galaxy granite, the background colour and flecking can vary considerably.
First Choice material will have no white lines or veins. Expect to pay a much higher price for large gangsaw-sized slabs. Lower cost Black Galaxy may have black or white lines or clouds however First Choice small blocks suitable for tiles and smaller-sized slab production are usually readily available. Low cost Black Galaxy granite retail tiles are usually of Commercial Quality material, only when placing First Choice alongside Commercial Quality would the layman tell the distinctive difference.Petrography
Gabbro: A dark-coloured, coarse-grained intrusive igneous rock. Gabbro is very similar to basalt in its mineral make up. It is composed mostly of the mineral plagioclase feldspar with smaller amounts of pyroxene and olivine.
Anorthosite: A Precambrian, phaneritic, intrusive igneous rock characterized by a predominance of calcium-rich plagioclase feldspar (90-100%), and a minimal mafic component (0-10%). Pyroxene, ilmenite, magnetite, and olivine are the mafic minerals most commonly present. All anorthosites found on Earth consist of coarse crystals but some samples of the rock taken from the Moon are finely crystalline.Black Galaxy Granite Types
Not all Black Galaxy granite is the same and different markets prefer different types. The gold specks are due to the presence of ferrous rich Enstatine (Bronzite) and can be broadly divided into three types based on the size of the gold coloured specks as:
2. Medium grained Star Galaxy - Our supply
3. Small grained Star Galaxy - Our supply
Also Black Galaxy granites have slightly varying background colours:
2. Dark with a Greenish/Black tinge
3. Dark with a Whiteish/Black background
Some Black Galaxy granites may require an epoxy resin application since they may appear to have a slightly open veining. The integrity of the granite is not affected with the epoxy applied solely for a visual effect to give it the smooth finish demanded by many purchasers. It is most unlikely that any type of sealer can successfully be applied to Black Galaxy granite.Black Galaxy Quality Standards
Grading standards for Black Galaxy Granite is generally accepted to be as follows:
2. Black Galaxy Q2 Standard Quality: Slabs and tiles with one or two visible veins known as mergeable lines.
3. Black Galaxy Q3 Commercial Quality: Slabs and tiles with two, three or more visible veins known as mergeable lines.
These lines do not affect the integrity of the material and are usually only visible from behind or very close up.
Synonyms: Black Ametist, Black Ametista, Black Amethyst, Black Amethysta, Black and Gold, Black Galaxi, Black Galaxy Granite, Black Gold Sands, GA 902, Galaxi Black, Galaxy Black, Galaxy Gold, Galaxy Star, Nero Ametista, Nero Galassia, Nero Galaxy, Nero Star Galaxi, Nero Star Galaxy, Star Galaxi, Star Galaxy Black, Star Galaxy Granite, Star Gallaxy, WG203Black Galaxy Granite Usage
Whilst Black Galaxy is used for many, many kitchen countertop projects and bathroom vanity tops the overwhelming majority of Black Galaxy is processed into calibrated tiles, paving or construction projects. Obviously a polished surface is the most common surface finish to bring out the best colours in the granite plus the glossy surface gives a great contrast to all types of accessories such as taps, sinks or cabinet door handles. Black Galaxy is also suitable for flamed (thermal), honed, river-washed, leather and brushed finishes. To learn more about these please go here.Black Galaxy Granite Durability
It is very hard-wearing, very durable and highly moisture resistant with a low maintenance cost however when used as a flooring material in high traffic areas, like all flooring materials, it can be subject to scratching from road and pavement dust and the worst of all is sand dust and that will have an effect on any surface!Black Galaxy Granite Supplies
Full Container Loads (FCLs) Only
An FCL Of Natural Stone Will Hold Between 18-27 Tonnes Depending On The Port Of Unloading