This precious mineral is found as crystals within metamorphic rock.
我们可以在变质岩中发现这种珍贵矿物的结晶体。
Structure-stratigraphic method is an effective method for stratigraphic study in Precambrian metamorphic rock area.
构造地层学方法是变质岩，尤其是前寒武纪变质岩地区地层研究的有效方法。
Structure-stratigraphic method is an effective method for stratigraphic study in Precambrian metamorphic rock area.
构造地层学方法是变质岩，尤其是前寒武纪变质岩地区地层研究的有效方法。
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