Grey limestone and iron oxide
Limestone
Lithographic limestone
Yellow limestone
Sample of limestone
Septarian nodule
Lapis lazuli, SEM
Sample of chalk
calcite veining in limestone
Banded iron ore
Quartz coated with silica
Chalk cliffs, Cyprus
Zinc ore under ultraviolet light
Zinc ore
Zincite in fraklinite
Rhodochrosite and pyrite
Lapis lazuli
Fluorite crystals
Calcite in mudstone
Pseudomorphic crystal growth
Apophyllite on calcite
Quartz encrusted calcite crystals
Calcite crystals
Manganese oxide, dendritic form
Pyrite crystals
Pyrite
Coral limestone
Banded calcite \Onyx\" I"
Andelusite crystals in slate
Slate with pyrite
Marcasite
Pyrite crystals in their host rock
Lapis lazuli crystals
Calcite bladed crystals
Aragonite
Sample of calcite
Coral calcite crystals
Silver crystals in calcite
Brazilianite crystals in calcite
Magnetite and calcite
Calcite crystal
Calcite
Aragonite-covered crayfish
Graphite on calcite crystals
Cut and polished septarian nodule
Pink calcite crystals
Calcium carbonate precipitation
Scalenohedral calcite crystals
Jarosite on rock
Lapis lazuli specimen
Oxynoticeras ammonite fossil
Fossil ammonite
Aragonite crystals
Limestone and shale strata
Geothermal limestone terrace
Geothermal limestone deposit
Rock concretions and minerals
Iron pyrite
Iron pyrite crystal, SEM
Iron pyrite crystals
Marcasite.
Hydrothermal quartz vein
Arsenopyrite crystals
Ammonite fossil
Sphalerite and pyrite
Pyrite interspersed with quartz
Quartz and pyrite
Iron pyrites
Octahedral crystals of Pyrite
Orpiment on pyrite
Sample of pyrite
Sylvanite crystals
Aragonite floral crystals
Red calcite crystals
Oolitic limestone, light micrograph
Banded calcite \Onyx\" II"
Red sandstone
Red and white sandstone
Conglomerate rock
Flint
Iron pyrite crystal
Sandstone in chalcedony matrix, polarised light micrograph
Marble
Deformed calcite crystal
Crenulation cleavage in calcite
Calcite globules
Septarian nodule surface
Pisolitic calcium carbonate
Crystalline calcite
Macrophotograph of crystals of calcite
Calcite crystal group
Skalenoedric calcite crystals
Calcium carbonate crystals, SEM
Red calcite, Mexico
String of pyrite cubes
Cluster of pyrite cubes
Lapis lazuli crystals I
Lapis lazuli crystals II
Calcareous mudstone
Glowing limestone chip
Galenite in pyrite
Calcite crystal rosettes
Magnesite crystals in groundmass
Scalenohedral calcite, close-up
Magnesite vein in igneous rock
Aragonite crystals with sulphur
Flos-ferri aragonite
Limestone cobbles on shale
Dolomite rock
Iron pyrite cubic crystals in matrix, collected at Mina Victoria, Navajun La Rioja, Spain
Sample of the mineral pyrite.
Polished lapis lazuli stone
Iron pyrite crystals, SEM
Pyrite with Hematite, Italy
Pyrite crystals, New Mexico, USA
Pyrite Sun
Pyrite crystals, Spain
Pyrite crystals on Shale
Pyrite crystals, Peru, South America
Pyrite Stalagtite
Quartz and Pyrite crystals
Pyrite mineral stone
Chalcopyrite specimen
Rock strain fringes, light micrograph
Iridescent pyrite in a clay nodule
Iron pyrite, light micrograph
Black smoker hydrothermal vent
Deformation structure in schist