ˈpirs ə nˌīt, ˈpər- noun
( -s )
Etymology: Louis V. Pirsson died 1919 American mineralogist + -ite
: a mineral Na 2 Ca(CO 3 ) 2 .2H 2 O consisting of a hydrous calcium sodium carbonate and occurring in white or colorless orthorhombic crystals (hardness 3, specific gravity 2.35)