Banded Magnetite Quartzeite
Crushers > Banded Magnetite Quartzeite; ... of repeated thin layers a few millimeters to a few centimeters in thickness of silver to black iron oxides either magnetite Fe 3 O 4 or hematite Fe 2 O 3 alternating with bands of ironpoor shales and cherts often red in color of similar thickness and containing microbands submillimeter of iron oxides.