magnetite

noun 0.589

troctolite

noun 0.583

ilmenite

noun 0.564

tantalite

noun 0.563

pyrrhotite

noun 0.544

titanite

noun 0.544

hematite

noun 0.539

limonite

noun 0.536

catlinite

noun 0.533

titanate

noun 0.528

tar sand

noun 0.526

tantalum

noun 0.526

talc

noun 0.524

black iron

noun 0.523

trachyte

noun 0.522

chromitite

noun 0.522

iron carbide

noun 0.519

bog iron

noun 0.517

coltan

noun 0.515

chromite

noun 0.514

tantalate

noun 0.511

palagonite

noun 0.508

cobaltite

noun 0.508

ferrite

noun 0.507

tennantite

noun 0.506

bornite

noun 0.505

manganite

noun 0.504

tin mine

noun 0.504

pyrolusite

noun 0.503

coal tar

noun 0.502

pitchblende

noun 0.501

siderite

noun 0.501