Prophets tell of the mystical nature endowed in luminous kernite. To the rest of us, it's an average looking ore that has 5% more yield than normal kernite and can make you rich if you mine it 24/7 and live to be very old.
Kernite is a fairly common ore type that yields a large amount of mexallon. Besides mexallon the kernite also has a bit of tritanium and isogen.
This ore is a compressed and much more dense version of the original ore.