Chiralite

Category:Resources
The first of the transdimensional elements, this crystal can invert free electrons into positrons for energy production.
Used in: Reactors
(spoilers!)
 
Common sources: Bonuses from surveying Anomalies -- especially abandoned Pyramids, salvage from destroying Burst Relays, purchases from Trade factions on the cheap (e.g. Ermyr Defenders, Island Traders).
Remarks: Energy production appears to be (mathematically, at least, and ignoring energy efficiency losses due to heat buildup) directly related to Chiralite unit count. The highest density, therefore, of energy-production-per-hex on your ship will be achieved with the highest reactor tech you can afford.
If you cannot afford to purchase the extra Chiralite to equip a higher-tech reactor, then you still benefit from installing all your Chiralite in lower-tech reactors until your energy needs are met (though you use up more hull hexes this way).
Because of the need for Chiralite in the game to resolve a handful of Anomalies, it's suggested that you carry a reserve of at least one or two units until you've completed e.g. Derelict Refinery, Stranded CXTA, and Secret Passage.