I think it could be reintroduced as also a sort of glass like material as is the malachite and the ebony in Skyrim , tough with a corrispondence in real life coudl be another kind of titanium / aluminium mineral that worked coudl lead to this kind of cristaline material almoust a diamond in hardness ....
Anyway http://media.criticstudio.com/wp-content/uploads/2012/06/game-of-thrones-valar_undead.jpgis how I imagine a Stalhrim sword or spear , and this is what I am probably introducing in my mod as well ... I would like ot put a Stalhrim ore but I want to find a plausible name or way to introduce it , should it be an alloy or an actual ore?
if alloy what to refine etc?