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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. Main colors are black and grey, inculding some black granite and Lava stone, which are very strong enough for countertops, vanity tops, sinks etc. besides, flamed and bush hammered basalt is very popular in public building paving and walling.
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