
===1: Cortisis - Ore/Mineral - RARREEEE
Cortosis is a rare mineral from the Star Wars Expanded Universe. It is a somewhat fragile light grey, chalky rock that has the strange property of being impervious to both heat and energy. It is highly resistant to blaster bolts, and cortosis alloys are capable of resisting or outright deactivating lightsabers, the only mineral to do so other than phrik. The process of mining cortosis requires the use of hydraulic jacks, since its properties rendered plasma torches useless.[1]

Cortosis is common in weaponry in the Star Wars universe. Many melee weapons are made from cortosis to fight lightsaber bearing enemies. In the ancient times of the Old Republic, during times of war with the Sith, it was common for fighters to carry cortosis-weave vibroblades and vibroswords, which could be used to fight Jedi and Dark Jedi in close-range combat. Sith in ancient times commonly carried a vibrosword rather than a lightsaber as it would wound opponents in a more painful manner, due to the dicing way the vibroblades cut.

In Jedi Outcast, Galak Fyyar processes cortosis ore into a black armor that is used by his Shadowtroopers. He also builds a suit of power armor that he uses himself. It is unknown whether all cortosis ore deposits are capable of such processing; the ore Fyyar used was smuggled from Cloud City.

===2: Phrik - Not very rare, higher up one?
Phrik is a very dense alloy in Star Wars. It gives resistance to lightsabers. General Grievous traveled with his droid bodyguards, a set of IG-100 series MagnaGuards, who wielded electrified staffs made of Phrik. Darth Sidious' lightsaber had a Phrik alloy covering. The dark troopers also had body armor made of the alloy.

Phrik is mined, as portrayed in Star Wars Droidworks. The alloy was also featured as a component in Dark Trooper manufacture in the game Dark Forces.



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===1: Sygium - Crystal - Rarerish
Stygium was a crystal only found on Aeten II. The Galactic Republic, in 22 BBY, passed a law controlling the trade of stygium, as it was a crystal that, when used properly, could entirely cloak a vehicle. In the Galactic Republic's early years these devices were common, since Aeten II held an abundance of them. These vehicles included the Scimitar, Darth Maul's flagship, which carried an array of stygium crystals in its long prow. During the events from the capture of the Tantive IV to the Battle of Endor, Grand Admiral Martio Batch sent an Empire superweapon to Aeten II, the Tarkin. There, the Tarkin blew open the planet to reveal its stygium core. Using the crystals and the original stygium implementation, he started the Phantom TIE project. However, saboteurs from the Rebel Alliance destroyed the project and Batch fled. The stygium crystal cloakings disappeared after the creation of the New Republic, although they were still available from Aeten II.

Stygium as a Lightsaber Crystal

In its pure, crystal form it was known to be suitable for use as a lightsaber crystal. When a Force-sensitive individual was wielding a weapon with this crystal in it, he was somehow more gifted in natural stealth and dexterity.