Tufa rock formation
Tufa
Limestone cave
Tufa formations at Mono Lake, USA
Aragonite crystals
石灰華
Limestone and shale strata
Aragonite
calcite veining in limestone
Cave of Swords, Naica Mine, Mexico
Eroded limestone coast, Newfoundland, Canada
Coquina
Flos-ferris Aragonite
石灰華 二股温泉
Calcareous soil
Pisolitic calcium carbonate
Chalk cliffs, south-east England
Chalk cliffs, Cyprus
Malachite
Brochantite
Sulphur deposits, Mount Iwo, Japan
Botryoidal hematite
Banded iron formation
Fossil debris in chalk, SEM
Polished limestone
Marble
Deformed calcite crystal
Crenulation cleavage in calcite
Calcite globules
Decrotive Paesina stone
Septarian nodule surface
Sample of chalk
Sample of limestone
Stromatolite crystals, SEM
Sample of calcite
Calcite crystals
Coral calcite crystals
Silver crystals in calcite
Brazilianite crystals in calcite
Magnetite and calcite
Aragonite crystals with sulphur
Flos-ferri aragonite
Pseudomorphic crystal growth
Calcite crystal
Calcite
Aragonite-covered crayfish
Graphite on calcite crystals
Cut and polished septarian nodule
Apophyllite on calcite
Aragonite (Sprudelstein)
Pisolite
Crystalline calcite
Pink calcite crystals
Zinc ore under ultraviolet light
Zinc ore
Calcite in mudstone
Zincite in fraklinite
Quartz encrusted calcite crystals
Septarian nodule
Geothermal limestone terrace
Geothermal limestone deposit
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
Ammonite fossils
Red calcite, Mexico
Fossil algae
Calcareous mudstone
Coral limestone
Oolitic limestone, light micrograph
Calcite rock concretion
Sulphur rocks
Baredine cave, Croatia
Folded rock strata
Phosphorite
Eroded limestone rock
Chrysocolla
Frost polygons, Canada
Malachite, SEM
Oil Shale specimen
Copper Ore
Siderite, and iron ore
Fossil Cystoid
Slate mining
Opencast coal mine
Silver wire, mine specimen
Sapphire mining, Madagascar
Malachite in host rock
Azurite in host rock
Azurite
Azurite and malachite
Mineral exploration drilling, Kenya
Diamond drill bit
Mining core samples, Kenya
Mining core sample, Kenya
Venetia Diamond Mine, South Africa
Diamond processing, Siberia, Russia
Quartz crystal cluster
Manganosite
Gypsum crystal group
Copper mine mill, Arizona, USA
Limestone cobbles on shale
Calcium carbonate crystals, SEM