ironness

ironness

(ˈaɪənnəs)
n
the state or quality of being iron
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in classic literature ?
Red-bearded it was, and red-haired, but even in dried death there was an ironness of feature and a massive brow that hinted to him of mastery of secrets beyond his ken.