Assertion: manganese | /r/AtLocation | nature
Facets:
value: as the dioxide mno2
type: OTHER
value: usually
type: DEGREE
Source sentences:
text: In nature, it is usually found in either its reduced +2 state, which easily dissolves in water or in the +4 state, which forms many types of insoluble oxides.
text: Where it ends up Manganese occurs everywhere and can be found in nature at background levels in air, soil, water and food.
text: Manganese is found in nature chiefly as the dioxide MnO2, called pyrolusite.