Traces of what looked like a green clay mineral.

看上去像是某种绿色粘土矿物的痕迹。

Williams says she hopes the study will interest drug companies that want to explore the healing properties of blue and green clays.

威廉姆斯称她希望这项研究能让一些探索蓝色和绿色泥土药效的药品公司感兴趣。

Blue and green clays are found in volcanic areas of the world. Around volcanoes, native peoples used the clays to improve their health. It seems they knew what they were doing.

世界上火山地区发现有蓝色和绿色的泥土，在火山周围，当地人使用这些泥土来促进健康，他们似乎知道自己在做什么。