igneous rocks are rocks that are formed from melted rocks 1 igneous rocks are one of the three main classes of rocks the others being sedimentary and metamorphic rocks
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Get Pricea pegmatite is a holocrystalline intrusive igneous rock composed of interlocking phaneritic crystals usually larger than 2 5 cm in size 1 inch such rocks are
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Get Pricehome » minerals » corundum corundum corundum has historically been used as an abrasive but it is most famous as the mineral of ruby and sapphire
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