andesite stone isolated white background |
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navigate by keyword : andesite aphanitic argillaceous background black carbon clay coal composition environment environmental extrusive foliated fossil fuel gem gemmology gemology geological geology green igneous intermediate isolated macro mineral natural nature ore piece porphyritic raw rock rough science spinach stone texture volcanic white |
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Andesite is an extrusive igneous volcanic rock of intermediate composition, with aphanitic to porphyritic texture. |
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