Calcite crystal
Pyrite cubes in host rock
Iron pyrite crystal
Magnetite and calcite
Calcite crystal rosettes
Pseudomorphic crystal growth
Sphalerite and pyrite
Calcite crystal group
Brazilianite crystals in calcite
Calcite
Fluorite crystals
Grey limestone and iron oxide
Magnesite crystals in groundmass
Azurite sample
Iron pyrite crystal, SEM
Pyrite crystals in their host rock
Pyrite crystals
Iron pyrites
Sample of pyrite
Iron pyrite crystals
Calcite crystals
Calcite globules
Quartz coated with silica
Scalenohedral calcite, close-up
Red calcite, Mexico
Red calcite crystals
Crenulation cleavage in calcite
Coral calcite crystals
Silver crystals in calcite
Graphite on calcite crystals
Apophyllite on calcite
Pink calcite crystals
Quartz encrusted calcite crystals
Skalenoedric calcite crystals
Scalenohedral calcite crystals
Macrophotograph of crystals of calcite
Calcite bladed crystals
Aragonite floral crystals
Cut and polished septarian nodule
Siderite and calcite
Pyritohedral crystals, close up
Pyrite crystals, Peru, South America
Pyrite and quartz, crystalline
Iron pyrite crystals, SEM
Andelusite crystals in slate
Pyrite interspersed with quartz
Lapis lazuli crystals I
Lapis lazuli crystals II
Orange crystal
Rock Types
Calcium carbonate crystals, SEM
Septarian nodule surface
Sylvanite crystals
Zincite in fraklinite
Septarian nodule
Calcium carbonate precipitation
Iron pyrite
Nailhead calcite and galena
Lapis lazuli, SEM
Crystals inside dinosaur fossils
Cluster of pyrite cubes
Pyrite
Marcasite stepped crystals
String of pyrite cubes
Chalcopyrite specimen
Marcasite.
Iridescent pyrite in a clay nodule
Iron pyrite, light micrograph
Arsenopyrite crystals
Cubic pyrite crystals
Marcasite mineral
Lapis lazuli crystals
Cerussite
Double refraction in a calcite crystal
Banded iron ore
Franklinitein calcite groundmass
Oxynoticeras ammonite fossil
Fossil ammonite
Aragonite botryoidal precipitate
Botryoidal aragonite
calcite veining in limestone
Calcite spherulites
Fluorite crystal
Pyrite on quartz
Quartz and pyrite
Cobalt calcite mineral sample
Deformed calcite crystal
Calcite rock concretion
Calcite in mudstone
Barite on Cerusite I
Barite on Cerusite II
Barite on Cerusite, close
Cerrusite
Calcite crystal specimen
Aragonite crystals
Smithsonite
Prehnite and calcite in groundmass
Sylvanite crystals in calcite groundmass
Limestone and shale strata
Galenite in pyrite
Pisolitic calcium carbonate
Zinc ore under ultraviolet light
Zinc ore
Rhodochrosite and pyrite
Lapis lazuli specimen
Lapis lazuli
Millerite in calcite groundmass, close-up
Lazurite crystals in a matrix of calcite
Sample of chalk
Artinite crystals in rock groundmass
Rhombohedral siderite crystals
Ammonite, pyritized
Pyritized ammonite
Arsenopyrite with siderite and pyrite crystals
Silver wire, mine specimen
Pyrites Ammonite spiral Calcite crystals
Haematite, SEM
Rhodochrosite showing crystal twinning
Rock concretions and minerals
Pyrite crystals.
Crystalline calcite
Pyrite dodecahedrons II
Pyrite dodecahedrons I
Kyanite and Staurolite crystals
Sample of calcite
Marcasite in chalk groundmass, close-up
Aragonite
Aragonite crystals with sulphur
Flos-ferri aragonite
Calcite bifringence
Calcite on amethyst
Wollastonite and calcite
Hemimorphite
Berzeliite mineral
Mollusc shell, SEM
Octahedral crystals of Pyrite