Assertion: manganese | /r/CapableOf | occur as pyrolusite
Facets:
value: principally
type: OTHER
Source sentences:
text: Manganese occurs principally as pyrolusite (MnO 2 ), braunite, (Mn2+Mn3+ 6 )(SiO 12 ), psilomelane (Ba,H 2 O) 2 Mn 5 O 10 , and to a lesser extent as rhodochrosite (MnCO 3 ).