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Gabbro  can be polished and be sold as black granite 

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Gabbro  can be polished and be sold as black granite 

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It can be used for cemetery markers, kitchen countertops, floor tiles, facing stones, and other stone products

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Later it can be found in Mid-ocean ridges and in ancient mountains composed of compressed and uplifted oceanic crust

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Later it can be found in Mid-ocean ridges and in ancient mountains composed of compressed and uplifted oceanic crust

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Over time it solidifies and makes its way to the surface 

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Over time it solidifies and makes its way to the surface 

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some take thousands or millions of years to fully solidifies

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Or deep plutons form when magma chambers that feed basaltic eruptions crystallize.     

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Or deep plutons form when magma chambers that feed basaltic eruptions crystallize.     

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A flow of thick lava from basaltic compositions (mafic, not a lot of scilica) slowly cools allowing large crystals to form. It cools because it starts to rise to the surface and away from the heat   

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A flow of thick lava from basaltic compositions (mafic, not a lot of scilica) slowly cools allowing large crystals to form. It cools because it starts to rise to the surface and away from the heat   