Mercury is home to exotic glaciers of salt, and they may host life beneath them 

 Salt glaciers uncovered on Mercury, the second planet from the sun, could have implications for the habitability of this tiny planet and similar worlds beyond the solar system. 

https://cdn.mos.cms.futurecdn.net/9Qqpx9XtKGeLzswZLNHkwC.jpg

https://www.space.com/mercury-salt-glaciers-habitability