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Black Galaxy Granite

Black Galaxy Granite Image
Black Galaxy Granite is a black gabbric anorthosite of the Precambrian period quarried Near Chimakurthi, Ongole, Andhra Pradesh, South India. It is fine to medium-grained with golden-yellow sparkling broncite scales however the density and size of these scales will vary depending upon the source quarry. Internationally Black Galaxy Granite 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 granite can have a dark black background, a dark black/green tinge or black with grey/white pinhead sized spotting. All types 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 therefore 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.

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 approximately 350 km north of Chennai where one would find about 50 Galaxy quarries but 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.

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:

    1. Large grained Black Galaxy (a.k.a. Popcorn)
    2. Medium grained Star Galaxy - Our supply
    3. Small grained Star Galaxy - Our supply

Also Black Galaxy granites have slightly varying background colours:

    1. Dark Black
    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 Granite Slab Sizes

Black Galaxy Granite Slab Image

Premium Quality Slab 2 & 3cm: When available 3000+mm x 2000+mm
Large Gangsaw Slabs: 2800mm & above x 1800mm & above
Medium Gangsaw Slabs: 2200mm & above x 1200mm & above
Vertical Cutter Slabs: 2200mm & above x 600~900mm

It must be noted that when suitable blocks are available we can produce slabs of 3200 mm x 2000 mm (126" x 79") however these will be very expensive and especially so when Premium quality.

A reasonable cost saving can usually be made when buying slightly smaller gangsaw slabs say 2600+ mm x 1400+ (102" x 55") and bear in mind that these are still large, heavy slabs weighing 220+ Kgs in 20 mm and 330 kgs in 30 mm (485 lbs & 730 lbs). When ordering crate loads of slabs it is important that you tell us the maximum weight crate you can handle safely since we normally pack 3~4 tonnes per crate.

Black Galaxy Granite Slab Image

Cutter Sawn Slab Sizes: Depending upon the finished slab sizes you require, cutter sawn sizes can represent a huge cost saving and especially so for kitchen worktops / countertops. Cutter sawn slabs are produced from the same quality blocks as the gangsawn slabs, quite simply they are the smaller blocks extracted at the same time from the quarry. These slabs are traditionally exported at 2400+ mm x 600~900 mm (95" x 24"~36") however if your requirement is for a shorter length, say 1200 mm x 600~900 mm (48" x 24"~36"), then even a bigger cost saving may be achieved.

Cutter slab crates are usually about half the height of gangsawn slab crates therefore expect three or four more crates per Full Container Load (FCL) yet more slabs per crate. These crates are invariably much easier to unload from a container and also are subject to much less in-transit damage. If the majority of your requirements are for producing cladding, flooring or strips, then this could be your best cost-saving solution.

Dimensioned Slabs: For project work we can supply already produced to your sizes or select suitable random-sized slabs for your own production. please let us know precisely your specifications.

Black Galaxy Granite Slab Inspection Video

We can accommodate any inspection service whether be it yourselves or a suitably qualified independent company.

Our inspection is included in the slab cost whereas an independent company may charge upwards of USD 300.00 for this service. It is very important to note that any independent company needs to be fully briefed as to your expectations since they are normally very experienced with this type of work and understand the Black Galaxy Granite agreed standards (shown below).


Black Galaxy Quality Standards

Grading standards for Black Galaxy Granite is generally accepted to be as follows:

    1. Black Galaxy Q1 First Choice: Slabs and tiles clean of any visible veining
    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 Galaxy granite known trading names include 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, WG203

Black 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

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