We know that each shard has a metal. Ruin: Atium; Preservation: Lerasium; Harmony: Harmonium; Odium: Raysium;
Cultivation: Shardblades; Honor: shardblades and honorblades. Devotion and Dominion: The Dor (kind of). So... if shardblades are ten alloys of cultivation and honors metals, then theoretically a Mistborn could burn them, and a hemulargist could make a spike from them, so would a shardblade of honor blade make a really useful spike because they already damage the spiritweb (I think). Also for an allomancer, would shardblades/plates be less functional because they are alloys? and last but not least, if The Dor can be a god metal alloy, could it be turned into a nugget somehow and be burned? Just thinking.
(I got this info from here)