Malatium
Malatium is an alloy of atium and gold.[1][2] The exact use is unclear; it allows an Allomancer to see either who another person was in the past, or who they could have become if they had made different choices. This metal is referred to in legend as the Eleventh Metal. It is described as being silvery white in color.
Allomantic Use
Malatium acts as a counterpart to gold, in that it allows an Allomancer to see into another persons past.[3]
Feruchemical Use
Malatium, when used by a Feruchemist, has unknown properties.
Hemalurgic use
When used as a Hemalurgic spike, Malatium steals some unknown trait or quality.
Trivia
Malatium is different from other allomantic metals, in that when it (and presumably the other Atium alloys) is burned, it provides the power rather than Preservation, since it is of Ruin. Plantilla:Annotation ref After becoming Harmony, Sazed thinks that legends about "Eleventh Metal" were made up by Ruin in order to help Kelsier's crew kill Lord Ruler. Sazed made such conclusion because even after becoming god, he didn't find any evidences of existence of this legends before Kelsier's jorney.