Guy Edwardes / Dawn mist around Hambledon Hill from Bullbarrow Hill, Cranbourne Chase, Dorset, England, UK. February 2016.

Eric Baccega / Dallol hot spring with salt concretions coloured by sulphur, potassium and iron, Dallol Volcano, Danakil Depression, Ethiopia, March 2015.

Eric Baccega / Dallol hot spring with salt concretions coloured by sulphur, potassium and iron, Dallol Volcano, Danakil Depression, Ethiopia, March 2015.

Eric Baccega / Dallol hot spring with salt concretions coloured by sulphur, potassium and iron, Dallol Volcano, Danakil Depression, Ethiopia, March 2015.

Pascal Kobeh / Giant clam (Tridacna) on 'Lotus' artificial reef, built in 2001 with a steel frame using mild electric currents to encourage coral growth, with diver in the background. Vabbinfaru Island in North Male...

Aflo / Stray cats, on black and one tabby, peering out of hole in rusty corrugated iron. Chiyoboinari Shrine, Kaizu, Japan.

Sergey Gorshkov / Snow goose (Chen caerulescens caerulescens) brooding chicks, with rusty orange face from iron rich soil in which it forages. Wrangel Island, Far Eastern Russia, June.

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

Jurgen 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,...

Luke Massey / 2020VISION / Two Turtle doves (Streptopelia turtur) perched on a rusting iron rail in a rain shower, Essex, England, UK, June.

Luke Massey / 2020VISION / Little owl (Athene noctua) perched on a rusting iron wheel, Essex, England, UK, June.

Luke Massey / 2020VISION / Little owl (Athene noctua) perched on a rusting iron wheel, Essex, England, UK, June.

Juan Carlos Munoz / Red waters of the Rio Tinto, coloured by dissolved minerals, primarily iron. Andalusia, Spain, December 2011.

Juan Carlos Munoz / Red waters of the Rio Tinto, coloured by dissolved minerals, primarily iron. Andalusia, Spain, December 2011.

Juan Carlos Munoz / Red waters of the Rio Tinto, coloured by dissolved minerals, primarily iron. Andalusia, Spain, December 2011.

Juan Carlos Munoz / Red waters of the Rio Tinto, coloured by dissolved minerals, primarily iron. Andalusia, Spain, December 2011.

Juan Carlos Munoz / Red waters of the Rio Tinto, coloured by dissolved minerals, primarily iron. Andalusia, Spain, December 2011.

Konrad Wothe / Magnificent riflebird (Ptiloris magnificus) male perched in rainforest, Iron Range National Park, Cape York Peninsula, North Queensland, Australia, November

Konrad Wothe / Common green tree frog (Litoria caerulea) in rainforest, Iron Range National Park, Cape York Peninsula, North Queensland, Australia, October

John Cancalosi / Staurolite (iron aluminum silicate hydroxide), always crystallized often with two indivuals intergrown at right angles forming a cross. Sometimes used as amulets or ornaments. A fairly common metamorh...

John Cancalosi / Pyrite (FeS2, iron sulfide), known as 'Fool's Gold'. Formerly used in the production of sulfuric acid. Sample from Concepcion de Oro, Zacatecas State, Mexico.

Chadden Hunter / Dallol hot springs where water heated by magma laden with potassium, sulphur and iron spews up through salt pans staining the salt deposits with vivid colours, in the bottom of the Rift Valley, 120 me...

Luiz Claudio Marigo / Turtle Rock, created by erosion in Sete Cidades National Park, municipality of Piracuruca, Piaua­ State, Northeastern Brazil. Darkening of the rock is due to the iron oxide. March 2009

Angelo Gandolfi / Las Medulas, Cordillera Cantabrica, Castilla y Leon, Spain. The landscape, now a natural reserve, is man-made: the rock formations are the result of iron mining since Roman times and the wood is culti...

Jack Dykinga / Concretion balls lining fracture lines in petrified sand dune formation, with lichen scaring calcification marks, Colorado Plateau, Arizona, USA

Wild Wonders of Europe / Smit / River Danube flowing through the Iron Gate Gorge, on the border between Romania and Serbia, Djerdap National Park, Serbia, June 2009

Wild Wonders of Europe / Smit / Photographer, Ruben Smit, above the River Danube flowing through the Iron Gate Gorge, on the border between Romania and Serbia, Djerdap National Park, Serbia, June 2009

Wild Wonders of Europe / Smit / Low clouds over the River Danube flowing through the Iron Gate Gorge, Djerdap National Park, Serbia, June 2009 WWE BOOK PLATE.

Guy Edwardes / Tre'r Ceiri Iron Age hill fort, Yr Eifl, looking towards the Menai Straits, Lleyn peninsula, Gwynedd, Wales, UK, December 2008

Jose B. Ruiz / Fig leaf in water from the Río Tinto, or Red River, very acidic and coloured deep red by iron dissolved in the water that drains from the local Riotinto mines causing severe environmental problems. Hu...

Jose B. Ruiz / Dead Libellula dragonfly in the Rio Tinto, or Red River, very acidic and coloured deep red by iron dissolved in the water, causing severe environmental problems. Huelva, Spain

Jose B. Ruiz / Río Tinto, or Red River, very acidic and coloured deep red by iron dissolved in the water that drains from the local Riotinto mines causing severe environmental problems. Huelva, Spain .

Flip Nicklin / Bearded Seal (Erignathus barbatus) male resting on ice floe with head dyed red from the high iron content of ocean mud in which he hunts for shrimp and clams, Svalbard, arctic Norway

Flip Nicklin / Bearded Seal (Erignathus barbatus) with head stained red from iron-rich soil sediments in which it forages for food, Svalbard, Norway

Fred Olivier / Spontaneous ignition of pyrite rich rocks, Smoking Hills, Inuvik, Canada's Northwest Territories, September.

Fred Olivier / Spontaneous ignition of pyrite rich rocks, Smoking Hills, Inuvik, Canada's Northwest Territories, September.

Graham Eaton / Opencast copper mine, rocks stained by copper and iron sulphide minerals. Parys Mountain was the world's largest copper mine in the 18th century. Amlwch, Anglesey, Wales, UK. July 2019.

Ashley Cooper / Photovoltaic panel on side of house. Near Puerto Natales, Magallanes, Chile. January 2020.

Ashley Cooper / Ironbridge, the world's first cast iron bridge. River Severn in flood conditions following Storm Ciara and Storm Dennis, the wettest February recorded in the UK. Shropshire, England, UK. February...

Philippe Clement / Corundum, crystalline form of aluminium oxide containing traces of iron, titanium, vanadium and chromium, found in Mysore, India on white background

Philippe Clement / The mineral pyrite / iron pyrite / fool's gold, iron sulfide found in Huaron, Peru against white background

Philippe Clement / Strunzite, phosphate triclinic-pinacoidal mineral containing hydrogen, iron, manganese, oxygen, and phosphorus against white background

Fred Olivier / Raft Point iron rich sandstone formation glowing in sunset light, Kimberley coast, Western Australia

Fred Olivier / King George River iron stained sandstone cliffs, Kimberley, Western Australia

Marie Lochman / Helena Aurora Range is Banded Iron Stone formation saved recently from mining and currently proposed A Class Reserve, Great Western Woodlands, Western Australia, August 2012

Marie Lochman / Kalamina Gorge showing Banded Iron formation, Karijini National Park, Western Australia. June 2014

Marie Lochman / Kalamina Gorge showing Banded Iron formation, Karijini National Park, Western Australia. June 2014

Marie Lochman / View into Dales Gorge at sunset, geologically ancient landscape showing Banded Iron Formation, Karijini National Park, Western Australia, June 2014