My crystals were covered in ants...

I sleep with crystals in my pillow and I decided to give them a charge by digging (I used my fingers and pushed dirt aside) a small hole, placing them inside and covering with a few leaves. Mind you there were no ants in sight.

I just went to go get them and they were swarming with ants. Like I had covered them in sugar and buried them in a nest. I know it's dirt, I know ants are outside, but it just felt weird. There is no food on the crystals. They have been inside a bag inside my pillowcase.

Thoughts?