Eroded chalk
Chalk cliffs, south-east England
Chalk cliff
Crumbling cliffs
Sample of chalk
Limestone and shale strata
Stalactites and stalagmites
Eroding coast
Chalk cliffs, Cyprus
Polished limestone
Sample of limestone
Calcite in mudstone
Geothermal limestone terrace
Geothermal limestone deposit
Tufa
Calcareous mudstone
Coral limestone
Oolitic limestone, light micrograph
Stalactites
Limestone cave
Fossil debris in chalk, SEM
Decrotive Paesina stone
Close-up of limestone rock formation, Minerva Terrace, Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA
Calcite rock concretion
Limestone cobbles on shale
Aragonite
calcite veining in limestone
Aragonite crystals
Eroded limestone rock
Patterned sandstone shaped by mineral-rich water
Marble
Stromatolite crystals, SEM
Brazilianite crystals in calcite
Aragonite-covered crayfish
Cut and polished septarian nodule
Ammonite fossils
Aragonite floral crystals
Coquina
Flos-ferris Aragonite
Fossil algae
Shale rock
Calcium carbonate formation at a hot spring, Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA
Chalk outcrop
Tufa rock formation
Pisolitic calcium carbonate
Stalactites and stalagmites in cave
Chalk cliffs and downs west of Lulworth, Dorset, UK
Eroded Gibber Plain
Eroded limestone coast, Newfoundland, Canada
Foraminiferan fossil, SEM
Foraminifera
Planktonic foraminifer (Nodosaria tetragona)
Deformed calcite crystal
Crenulation cleavage in calcite
Calcite globules
Septarian nodule surface
Sample of calcite
Calcite crystals
Coral calcite crystals
Silver crystals in calcite
Magnetite and calcite
Aragonite crystals with sulphur
Flos-ferri aragonite
Pseudomorphic crystal growth
Calcite crystal
Calcite
Graphite on calcite crystals
Apophyllite on calcite
Aragonite (Sprudelstein)
Pisolite
Crystalline calcite
Pink calcite crystals
Zinc ore under ultraviolet light
Zinc ore
Zincite in fraklinite
Quartz encrusted calcite crystals
Septarian nodule
Lithographic limestone
Grey limestone and iron oxide
Limestone
Yellow limestone
Calcium carbonate precipitation
Macrophotograph of crystals of calcite
Calcite crystal group
Skalenoedric calcite crystals
Scalenohedral calcite crystals
Calcium carbonate crystals, SEM
Red calcite crystals
Red calcite, Mexico
Eroded limestone pinnacles
Aragonite botryoidal precipitate
Oyster beds in cliff
Dark sea cave
Coastal limestone platform
Calcareous soil
Atolls, Baa Atoll, Maldives
Jurassic Coast, Isle of Purbeck, Dorset
Terraces at a hot spring, Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA
Botryoidal aragonite
Sylvanite crystals
石灰華
Baredine cave, Croatia
Cliff's Rocks, Abstract, High Angle View
Pile of coal
Kesselspitze, Radstatt Alps, Austria
Sedimentary rock
Badlands
Comb Ridge, Utah, USA
Full frame of eroded sandstone at Silence beach
Full frame of eroded sandstone texture at Silence beach
Full frame of natural eroded sandstone texture at Silence beach
Large Red Rock Formation, Low Angle View, Arches National Park, Moab, Utah, USA
background of coal
Seven Sisters
Chalk cliffs
Chalk grassland with scrub
Chalk-hill blue butterfly
Ronda, Spain
The Palisade, Colorado, USA
Vikos Gorge, Greece
Venetikos River, Greece
Duden Waterfalls, Turkey
39 Steps Waterfall, South Africa
Thomson's Falls, Kenya
Limestone pavement
Aerial view of Porisjokull glacier
Mollusc shell, SEM
Close-up of sandstone formations
Calcite crystal rosettes
Marble, polarised light micrograph
Barytocalcite crystals in rock groundmass
Ankerite crystals in groundmass, close-up
Magnesite crystals in groundmass
Artinite crystals in rock groundmass
Rhombohedral siderite crystals
Magnesite vein in igneous rock
Mammoth Hot Springs, Yellowstone
Tilted Rock Formations-Absract Pattern
Foraminifera, polarised light micrograph
Chunk of coal on fire
Energy