basalt rock on white background.

aphanitic argillaceous background basalt black boulder carbon carbonate caused clay coal composition crystal distributed environment environmental extrusive felsic foliated forms fossil fuel gem gemmology gemology geological geology glassy grain hard igneous isolated macro marble metamorphic metamorphism minerals natural noise nonfoliated object originally piece porphyritic pure rhyolite rock rocks rough sand science sedimentary shooting single solid specimen spinach stone structure tectonics texture there type volcanic volcano white