basalt stone white background |
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| navigate by keyword : argillaceous background basalt black carbon clay coal commonly composed darkcolored environment environmental extrusive finegrained foliated forms fossil fuel gem gemmology gemology geological geology igneous macro mainly mineral minerals most natural nature ore piece plagioclase pyroxene raw rock rough science spinach stone white |
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| Basalt is a dark-colored, fine-grained, igneous rock composed mainly of plagioclase and pyroxene minerals. It most commonly forms as an extrusive rock, |
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