There is also a single mineral collection, such as natural agate, opal.

也有少数是天然单矿物集合体，如玛瑙、欧泊。

youdao

There is also a single mineral collection, such as natural agate, opal.

也有少数是天然单矿物集合体，如玛瑙、欧泊。

youdao