In the mid to late 1990’s, reliable and consistent rock supply was hard to find. Boulder Wall Constructions identified the need to control this resource internally, in order to maintain consistency on our projects. As a result, we have now been operating our own extractive quarries sourcing a variety of rock material for more than 20 years. We are proud to have operated our own quarries all over Queensland, in areas such as Warwick, Yangan, Maroon, Rockhampton, Helidon, Gladstone, Trade Coast and Swanbank. By running our own quarry operations for some types of rock, we are able to guarantee consistent, quality rock supply to all our clients.
For more information on our current supply and rock types available, visit: www.rockworx.com.au
Porphyry is a type of hard, igneous rock that is formed when rising magma in a volcano is cooled near the surface under certain conditions. The result is a composition of tiny matrix crystals (such as quartz) and other much larger crystals called phenocrysts.
The word porphyry comes from the Greek word 'porphura' meaning purple, as porphyry is most commonly recognised by its unique and beautiful colour, which varies from a reddish-brown to purple. It is considered to have a similar appearance to sandstone but with a much harder and more durable texture.
Sandstone is a sedimentary rock composed of very small grains of minerals or rocks, usually the size of grains of sand. It can vary from soft to hard depending on the composition of minerals and environment in which it is formed – generally oceans, lakes and rivers. Over time, layers of sand get buried until it turns into solid rock.
Its colour can vary greatly and is dependent on the minerals it contains, but the most common colours are grey, tan, pink and yellow. It is porous and gritty to touch like sandpaper.
Random sandstone includes random shaped boulders more rounded than cut blocks which are graded into A and B Grade sandstone.
Sawn A-Grade is a cut block of sandstone, with 5 wheel-sawn edges and one smooth faced side. It has the same geological properties as random sandstone.
Granite is a light-coloured igneous rock that is formed as a result of the slow crystallisation of magma below the earth’s surface. It is composed mainly of quartz and feldspar and can range in colour from pink to light or dark grey. The word granite comes from the Latin word ‘granum’ meaning grain, due to its granular appearance.
As one of the most commonly found igneous rocks, granite is widely used in construction due to its high load bearing capacity and fracture resistance. Compared to more porous rock such as sandstone, granite is harder, more weather resistant and deterioriates more slowly.
B-Grade Sandstone are cut blocks with a minimum of 2 opposite sides that are wheel sawn. B Select Sandstone has 4 sawn sides.
It has the same geological properties as random sandstone.
Rough faced A-Grade is a cut block with 5 wheel-sawn edges and one natural face. It has the same geological properties as random sandstone.