Khalk is the letter K
There is no stanza in the rune poem for Khalk, it is Northumbrian Rune.
Khalk, typically translated to mean cup or chalice, is one of the northumbrian runes. Most early esoteric rune lore interepreted Khalk as being the a refernce to the Holy Grail.
To me Khalk is a cup, the Cup of Victory and Attainment, but also the Cup of Dreams and Desires. In a reading it shows either reaching your goals, or realizing what those goals might be, and how much farther your need to go to reach them. As I was engaging in some dreaming work today, I also had the insight that Khalk might also beneficial to dreams, useful in engaging in dream work, but also in as an indicator that you should look to your dreams for answers or insight to your question or needs. Not only night dreams, but your day dreams of success of attainment as well.