The Classical Application Of Basalt In Spain I
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2010-11-08 11:22:20
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Basalt is a common extrusive volcanic rock. It is usually grey to black and fine-grained due to rapid cooling of lava at the surface of a planet. It may be porphyritic containing larger crystals in a fine matrix, or vesicular, or frothy scoria. Unweathered basalt is black or grey.
Basalt is used in construction (e.g. as building blocks or in the groundwork), making cobblestones (from columnar basalt) and in making statues. Heating and extruding basalt yields stone wool, an excellent thermal insulator. Because of its abrasion resistance , less draft, poor conductivity, compression and strong, crushing the value of low, corrosion resistance, it is internationally recognized and regarded as the best material for the road and railway construction .
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