closeup sample natural basalt rock extrusive igneous |
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navigate by keyword : background basalt closeup comprises construction environment environmental extrusive gemmology gemology geological geology grained granite harmonious himalayas homogeneous igneous isolated macro mafic material mineral mineralogy more most natural nature nobody object outdoor pebble piece raw rock rocks rocky rough sample science shale single specimen stone stones structure surface texture than volcanic white widespread |
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Basalt is a mafic extrusive rock, is the most widespread of all igneous rocks, and comprises more than 90% of all volcanic rocks. |
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