如果在某一次取样中，所有的锆石里都不含这种矿物，那就是在提示包体的化学成分可能已经发生了改变。
If that type of mineral is missing from all of the zircons in a particular sample, he notes, that's a clue that the inclusions may have been chemically altered.
一些专家认为这些人长寿应归功于他们饮用的明显不含杂质的天然矿物质水。
Some have attributed this longevity to their consumption of a natural mineral water, which is remarkably free from impurities.
Morris和他的同事正在建模，关于那些不含水的矿物和层状硅酸盐的星盘的红外光谱特征。
Morris and her colleagues began by modeling the infrared emission features of dust that did not contain hydrated minerals, or phyllosilicates.
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