dickinsonite
noun
dick·in·son·ite
ˈdikə̇nsəˌnīt
plural -s
: a green mineral H2Na6(Mn,Fe,Ca,Mg)14(PO4)12.H2O consisting of foliated hydrous acid phosphate chiefly of manganese, iron, and sodium (specific gravity 3.34)
Word History
Etymology
William Dickinson, 19th century American clergyman and mineralogist + English -ite