məˈgəvə(r)ˌnīt noun
( -s )
Usage: often capitalized M&G
Etymology: J.J. McGovern died 1915 American mine foreman + English -ite
: a mineral Mn 5 (AsO 3 ) 2 SiO 3 (OH) 2 consisting of a basic silicate and arsenite of manganese that is found at Sterling Hill, N.J.