Because they cool slowly the mineral crystals have enough time to grow to a size which can be easily seen with the naked eye. Thus the intrusive igneous rocks usually have a coarse texture.
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美
释义
岩石中矿物晶体就有足够的时间结晶生长,这样,岩石中矿物便足够的大,以致于用肉限也可辨认它们。所以侵入岩通常具有粗粒结构。
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