Ichorium is the ingot form of Ichor added by Thaumic Tinkerer. It is mainly used to craft Ichorium Tools.
More endeavours with Ichor reveal its property to blend with most mundane materials. Most of the blends result in absolutely nothing, however, you have managed to blend it with diamonds and fabric in the past, and this time, with thaumium.
This metal is extremely strong and resilient, to a point where mundane materials could never get. You haven't found any uses for it yet, but you know it shouldn't take you too long.