Basalt is a common extrusive igneous (volcanic) rock formed from the rapid cooling of basaltic lava. Basalt is usually grey to black in colour, but rapidly weathers to brown or rust-red due to oxidation of its mafic minerals into rust.
It is seen in architecture for hundreds of years, using this kind of volcanic stone. It was used by the ancient Romans to build roads and monuments. it’s also chock full of magnesium, feldspar, pyroxene and iron, with hints of olivine and amphibole – these features make it sort of like granite’s cleaner and sexier. It is a stone quite popular among contemporary designers and a favorite of yours truly’s!
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