beraunite

beraunite

[bə′rau̇‚nīt]
(mineralogy)
Fe2+Fe3+(PO4)3(OH)5·3H2O A reddish-brown to blood red, monoclinic mineral consisting of hydrated basic phosphate of ferric and ferrous iron.
References in periodicals archive ?
The Red Ball mine, Calhoun County, Alabama, was once a source of iron for Confederate cannon, and now is a source of colorful strengite, cacoxenite, beraunite, and kidwellite in earthy brown "bog iron" matrixes.