Theories, speculation and headcanons about lightsaber resistant materials
What are your theories, ideas and headcanons you have about the various metals, ores and other materials which are capable of resisting lightsabers such as Beskar, Cortosis, Phrik and others in Star Wars universe whenever it's about their history and origins, where to find them, and the way they are mined or forged or used, their cultural importance for those who use them as well as those they are used against most famously the Jedi?
Which one is the most practical? Which one is the most expensive or cheapest? Who found the best use of them?
I like to imagine that the Morgukai were the ones who found and developped the process of purifying Cortosis which turns the metal which desactivates lightsabers but is otherwise brittle into a nearly-indestructible metal; with said method being later used by Imperial Knights for their armors and gauntlets; through millenias of forging, use and experimentations with the precious metal they use to make their weapons, armor and gauntlets with which they famously fought Jedi for centuries.