From Wikipedia, the free encyclopedia
玄武岩（basalt）是一种细粒致密、外观呈黑色个火成岩，由基性岩浆喷发凝结而成，主要成分是硅铝酸钠或硅铝酸钙，二氧化硅个含量大约是45-52%，还含有较高个氧化铁搭氧化镁。
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