藍鐵礦，是於1817年時，A.G.Werner為了紀念最早在英國Cornwall地區發現藍鐵礦的英國礦物學家J.G.Vivian，而以此為名。又因其外表發出閃亮的藍顏色故也有Blueironearth的別名。藍鐵礦的化學成分為Fe3(PO4)2．(H2O)8，是一種含水的鐵磷酸鹽類礦物。
Vivianite (Fe2+Fe2+2(PO4)2·8H2O) is a hydrated iron phosphate mineral found in a number of geological environments. Small amounts of manganese Mn2+, magnesium Mg and calcium Ca may substitute for iron Fe2+ in the structure. Pure vivianite is colorless, but the mineral oxidizes very easily, changing the color, and it is usually found as deep blue to deep bluish green prismatic to flattened crystals.
It was named by Abraham Gottlob Werner in 1817, the year of his death, after either John Henry Vivian (1785-1855), a Welsh-Cornish politician, mine owner and mineralogist living in Truro, Cornwall, England, or after Jeffrey G. Vivian, an English mineralogist. Vivianite was discovered at Wheal Kind, in St Agnes, Cornwall.