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Basalt is an igneous extrusive, volcanic rock. It can be be found in the world as raw basalt in the Igneous Extrusive layer. When mined it drops rock items instead of raw blocks.
It can be knapped into heads for a stone hammer, stone shovel, stone hoe, stone axe, stone knife and a stone javelin. Igneous extrusive rock produces the most durable stone tools.
Raw basalt can be used to make a Stone Anvil.