Iron may not be rare but the value of iron ores is subtly dependent on eg, non-iron content "A few smelting companies formed in the late 19th and early 20th ce

Iron may not be rare but the value of iron ores is subtly dependent on eg, non-iron content "A few smelting companies formed in the late 19th and early 20th centuries, but were unable to process the ore with any economic success due to the sandy nature and high titanium content, which tended to form hard, brittle carbides in the steel." https://en.wikipedia.org/wiki/Ironsand#:~:text=%5D%20A%20few%20smelting%20companies%20formed%20in%20the%20late%2019th%20and%20early%2020th%20centuries%2C%20but%20were%20unable%20to%20process%20the%20ore%20with%20any%20economic%20success%20due%20to%20the%20sandy%20nature%20and%20high%20titanium%20content%2C%20which%20tended%20to%20form%20hard%2C%20brittle%20carbides%20in%20the%20steel.%20In https://en.wikipedia.org/wiki/Ironsand#:~:text=%5D%20A%20few... Even today's "economic" process wastes all that titanium (which should be even more valuable for a lunar economy - Ti burning is a major thorn on earth!)