tirse -tir- gismu

x1 is a quantity of/contains/is made of iron (Fe); [metaphor: strong, durable, tarnishing].

Also (adjective:) x1 is ferric/ferrous. See also jinme, gasta, molki.


In notes:

gasta
x1 is a quantity of/is made of/contains steel of composition including x2.
jinme
x1 is a quantity of/contains/is made of made of metal of composition including x2.
molki
x1 is a mill/foundry/industrial plant/[assembly line] performing process x2.
furtirse
t1=f1 is a quantity of/contains/is made of rust.