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爱石人中的有眼福者,偶尔可以从破开的圆球体玛瑙石的剖面上,观赏到球形玛瑙内部酷如树木年轮的天然纹样。那是因为有些玛瑙石的形成过程,是当它还作为一团岩浆从火山口喷射出
Occasionally, people who love the stone can see the natural patterns inside the onyx agate such as the tree rings on the profile of the broken round agate stone. That is because some agate stone formation process, when it is also as a mass of magma ejected from the crater