ˌpīrōˈȯˌrīt noun
( -s )
Etymology: Swedish pyroaurit, from pyr- + Latin aurum gold + Swedish -it -ite; from its resemblance to gold after being heated — more at oriole
: a mineral Mg 6 Fe 2 (OH) 16 CO 3 .4H 2 O that is a hydrous basic carbonate of magnesium and iron