玄武岩(hiân-bú-giâm,英文:basalt)是一種火山岩(volcanic rock),大份烏烏抑鳥鼠仔色,火膏佇地表真緊冷落來就會造成玄武岩,玄武岩有 SiO2 45~52%,結晶較大粒的玄武岩算一種斑岩(porphyritic)的結構,玄武岩本身是烏的,伊的礦物成份大體是斜長石(plagioclase)和輝石(pyroxene),嘛有少少的橄欖石(olivine); 遮的礦物予玄武岩有無仝的特色。

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