I am an igneous rock. I am very hard and durable. I am used in buildings and worktops. - I am granite., I am a metamorphic rock. I look polished and smooth - I am marble., I am a sedimentary rock.   I can be used for roads, statues and buildings. - I am sandstone., I am easily moldable when wet. I am made of fine-grain minerals. I am used for pottery. - I am clay., I am formed near volcanoes. I have lots of air bubbles. I can be used for cleaning homes or humans. - I am pumice., I am a sedimentary rock. I am soft and usually white. I can be used to write with. - I am chalk.,

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