这颗晶洞切开后，露出了内部美丽的紫色水晶。

When we split open the ___geode, beautiful purple crystals were revealed inside.

我在矿石展上买了一个漂亮的水晶洞，里面的紫水晶闪闪发光。

I bought a beautiful ___geode at the mineral show, with sparkling amethyst crystals inside.