Minerals identify

Know how to recognize them

Akaganéite

Oxide mineral

Akaganeite, also written as the deprecated Akaganéite, -containing iron(III) oxide-hydroxide , formed by the weathering of pyrrhotite (Fe1−xS).

Akaganeite is often described as the β phase of anhydrous ferric oxyhydroxide (or fluoride so a more accurate formula is FeO 0.833(OH) 1.167Cl 0.167. may substitute for iron, yielding the more general formula (Fe3+,Ni2+ ) 8(OH,O) 16Cl 1.25

Akaganeite has a metallic and a brownish yellow streak. Its crystal structure and similar to that of hollandite BaMn 8O 16, characterised by the presence of tunnels parallel to the c-axis of the tetragonal lattice. These tunnels are partially occupied by chloride anions that give to the crystal its structural stability.

Identification

Color of mineral

Brown
Yellow

The streak

Yellow

Crystal ( diaphaneity )

Monoclinic