Dark Matter is seen used by Fiends to create powerful, destructive golems that exhibit the traits of Shadow-affiliation. An excerpt from the Wiki gives the line "A fabled mineral dark and ominous in color said to contain the essences of both chaos and nothingness."

So what about the other four Minerals? Do their traits of Strength, Faith, Knowledge, and Life enable them to be used in such a form as Dark Matter? Is a "Light Trojan" even feasible?

One last thing. Red, violet, green, and yellow are all damage colors; matching Normal, Shadow, Elemental, and Piercing, respectively. What's Moonstone? Blue has no apparent correspondence to anything in the SK universe as of yet, except maybe electricity as seen in the Anniversary event, or frost as seen in Heart of Ice. Either it's flexible as both or serves another purpose.