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basalts common aphanitic igneous extrusive volcanic rocks occur types social mineral prefix raw basalt rock isolated white background stone coal black ore geology carbon piece macro fuel crystal nature material natural fossil granite lava mining volcano specimen grey cutout scoria pyroclastic highly vesicular dark-colored dark colored crystals low silica colour iron magnesium limestone bakground sedimentary composed calcite calcium carbonate wall constructed gray texture form magma molten cools crystallizes volcanoes surface earth melted still inside crust