Basalt is a volcanic stone, from the igneous class – a stone with a fire sign. Although basalts boast the durability of granite, they have a restrict color palette, even with a consistent coloration, markings and subtlety. Basalt lava flows tend to cool and crack into hexagonal columns, like a giant bundle of pencil-shaped stone – a familiar well done selection.
As an extrusive igneous stone, basalt has crystallized from the erupted lava in a volcanic chimney. Basalt is a young stone, cools and crystallizes quickly at the Earth’s surface resulting in very small, microscopic crystals. As a mafic igneous stones are iron and magnesium rich. It naturally solidifies into hexagonal columns, sometimes creating an extraordinary pattern structure.
This stone is minimally sensitive to acids. It will not acid etch or lose its surface sheen when exposed to acidic liquids. However, it has a medium to high absorption rate. Basalt, as a porous stone, with naturally-occurring holes that may remain unfilled or be manufacturer-filled with resin or cement. However, without experience, do not use resin-filled material outside, as the resin will discolor over time. Always seal this stone prior to grouting or use. Oil and highly-pigmented liquids can penetrate and stain the stone.
Blocks and slabs vary in appearance and dimension. As this is natural stone, all pictures are a rough guide.