Natural mineral hackmanite can change color almost indefinitely enabling numerous applications

While investigating hackmanite, a natural wonder material, researchers found that it, in addition to two other minerals, can change their color upon exposure to UV radiation repeatedly without wearing out. The results show that the inexpensive hackmanite, which is easy to synthesise, is also an excellent material because of its high durability and applicability for different purposes.

from Top Technology News -- ScienceDaily https://www.sciencedaily.com/releases/2022/06/220621105621.htm