Dr. Axel Gebauer / Bacteria - iron and manganese oxidizers and their complementary reducers, in the mud of an empty fish pond, Upper Lusatia Heath and Pond Landscape, Upper Lusatia UNESCO Biosphere Reserve, Germany

Juergen Freund / Aerial of Sturt Stoney Desert with gibber rocks. Gibber rocks are millions of years wind and water weathered chalcedonised sandstone with a hardened crust of soil cemented silica, iron and manganese,...

Adrian Davies / Coloured film on water surface caused by chemoautotrophic bacteria that oxidise iron and manganese ions in the water. Thursley National Nature Reserve, Thursley, Surrey, England, UK. June.

Sylvain Cordier / Sandstone with oxidation (iron and manganese), Flores island, Indonesia

Sylvain Cordier / Sandstone with oxidation (iron, manganese), Pink rock, Flores island, Indonesia

Sylvain Cordier / Sandstone with oxidation (iron and manganese), Flores island, Indonesia

Sylvain Cordier / Sandstone with oxidation (iron and manganese) Flores island, Indonesia

Sylvain Cordier / Sandstone with oxidation (iron and manganese), Pink rock, Flores island, Indonesia

John Cancalosi / Polymetallic nodule, also called manganese nodule, rock concretions on the sea bottom formed of concentric layers of iron and manganese hydroxides around a core. Blake plateau, Atlantic

John Cancalosi / Rhodochrosite a manganese carbonate mineral with chemical composition MnCO3. In its (rare) pure form, it is typically a rose-red color, but impure specimens can be shades of pink to pale brown, Argent...

John Cancalosi / Polymetallic nodule, also called manganese nodule, rock concretion formed of concentric layers of iron and manganese hydroxides around a core. From Blake Plateau, Atlantic ocean, collected in 1970's.

Alex Hyde / Raft spider (Dolomedes fimbriatus) female on Heathland pool, Surrey, UK. October. The multicoloured film results from chemoautotrophic bacteria that oxidise iron and manganese ions in the water, with...