Complex sentence: Hollandite (chemical formula: Ba (Mn 4 + 6 Mn 3 + 2) O 16) is an oxide mineral and is the barium-manganese (III) endmember of the coronadite group.
Split into simpler sentences: Hollandite (chemical formula: Ba (Mn 4 + 6 Mn 3 + 2) O 16) is an oxide mineral. It is the barium-manganese (III) endmember of the coronadite group.