What is explosive antimony and why does it change when scratched?

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A labeled periodic table entry for antimony shows its symbol Sb, atomic number 51, atomic weight 121.76, electron configuration, and name. It is a solid, weakly acidic other metal with a rhombohedral crystal structure at room temperature. — antimony Properties of antimony.

Explosive antimony is an unstable, amorphous form of the chemical element antimony that is produced through electrolytic deposition under specific conditions.1

It is referred to as "explosive" because it is in a metastable state; when it is bent or scratched, it undergoes a rapid, mildly explosive transition into the more stable, metallic form of the element.1