pyrochroite
noun
py·rochro·ite
ˌpīrəˈkrōˌīt,
pīˈräkrəˌwīt
plural -s
: a mineral Mn(OH)2 that is a natural manganous hydroxide
Word History
Etymology
Swedish pyrochroit, from pyr- + Greek chrōs color + Swedish -it -ite; from the fact that it becomes colored when heated