火成岩和变质岩比较致密，通常是结晶性的，颗粒之间很少有空隙。
Igneous and metamorphic rocks are more compact, commonly crystalline, and rarely contain spaces between grains.
随着煤变质程度的升高，煤层夹矸中高岭石的结晶度、有序度也随之升高。
With the rise of the coal rank, the crystallinity of kaolinite and its order in the anthracite bed go up.
我们可以在变质岩中发现这种珍贵矿物的结晶体。
This precious mineral is found as crystals within metamorphic rock.
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