1) Calcium mineral 2) Phosphate mineral 
Delvauxite, also known as borickite, is a yellow to brown to dark brown amorphous mineral, sometimes forming a botryoidal mass. Its chemical formula is CaFe4(PO4,SO4)2(OH)8•(4-6)H2O. It may sometimes form stalactites. It was first described in 1838 by Belgian chemist, Dumont and dedicate to J.S.P.J. Delvaux de Feuffe (1782–1863). It was found ...
Delvauxite is a mineral source of phosphate. It has a relative hardness of 2. 5.