一种硬的、致密的、黑色的火山岩。它主要由斜长石、辉石和橄榄石组成，外表经常很光滑。
A hard, dense, dark volcanic rock composed chiefly of plagioclase, pyroxene, and olivine, and often having a glassy appearance.
一种硬的、致密的、黑色的火山岩。它主要由斜长石、辉石和橄榄石组成，外表经常很光滑。
A hard, dense, dark volcanic rock composed chiefly of plagioclase, pyroxene, and olivine, and often having a glassy appearance.
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