Halkonite puzzle boxes were made from Halkonite steel. They were impenetrable. Nothing could escape them, not even thoughts. In 2008, Sarah Jane Smith used a box made of Halkonite steel to contain a fragment of the Weserbergland meteorite where the Pied Piper had been trapped. (TV: The Day of the Clown) Behind the scenes Edit According to the official SJA website the box is from a place called Halkon. Footnotes Edit ↑ SJA - Alien Objects Retrieved from "https://tardis.fandom.com/wiki/Halkonite_puzzle_box?oldid=2976786" Categories: Sarah Jane Smith's possessions Puzzles Prisons + cat Cancel Save Community content is available under CC-BY-SA unless otherwise noted.