Haematite, SEM
Calcium carbonate crystals, SEM
Sample of haematite
Pseudomorphic crystal growth
Haematite mineral rock
Haematite mineral specimen
Hematite crystals
Haematite
Haematite crystal
Haematite group of stones
Haematite tumblestone polished stone
Crystals of haematite in quartz
Magnetite and calcite
Hematite, an ore of Iron, Massachusetts
Hematite ore of Iron, Brazil
Hematite, an ore of iron
Hematite, an iron ore
Hematite, an iron ore, Minnesota, USA
Hematite, England
Hematite, Pencil Ore variety, England
Banded iron specimen
Banded iron formation
Magnetite
Sapphire, SEM
Magnetite octahedra
Magnetite octaheders
Ruby crystals, SEM
Crenulation cleavage in calcite
Aragonite crystals with sulphur
Haematite ore
Haematite specimen
Magnetite, SEM
Pink beryl crystal, SEM
Sandstone in chalcedony matrix, polarised light micrograph
Mollusc shell, SEM
Haematite (kidney ore)
Mineral precipitation in agate
Brecciated Agate stone
Hyacinth quartz
Ruby
Chalcopyrite, SEM
Synthetic abalone shell, SEM
Limescale deposit in copper piping
Fossil debris in chalk, SEM
Hematite, close-up
Calcite globules
Septarian nodule surface
Calcite crystals
Coral calcite crystals
Silver crystals in calcite
Brazilianite crystals in calcite
Aragonite crystals
Flos-ferri aragonite
Calcite crystal
Calcite
Graphite on calcite crystals
Cut and polished septarian nodule
Apophyllite on calcite
Pink calcite crystals
Zincite in fraklinite
Quartz encrusted calcite crystals
Septarian nodule
Calcium carbonate precipitation
Macrophotograph of crystals of calcite
Calcite crystal group
Aragonite
Skalenoedric calcite crystals
Scalenohedral calcite crystals
Red calcite, Mexico
Coccolithophore shell, SEM
Coccolithophore, SEM
Copper oxide crystals, SEM
Pyrolusite in quartz
Malachite crystals, SEM
Used water softening pellets
Nautilus siphuncle structure, SEM
Nautilus siphuncle crystals, SEM
Cerussite
Quartz crystals, SEM
Quartz crystal, SEM
Sandstone in dusty matrix, polarised light micrograph
Agate lava geode
Siderite and calcite
Muscovite
Sylvanite crystals
Aragonite floral crystals
Red calcite crystals
Banded iron formation (BIF)
Banded Ironstone Formation (BIF)
Barite crystals, SEM
Lumps of hematite iron ore
Turquoise embedded in iron oxide
Calcareous phytoplankton, SEM
Azurite crystals, SEM
Pyrite and quartz, crystalline
Fluorapatite crystal, SEM
Cassiterite crystals in groundmass
Gas hydrate crystals, SEM
Stromatolite crystals, SEM
Smithsonite
Haematite on Mars, satellite image
Water softening pellets, micrograph
Calcite crystals, SEM
Pisolitic calcium carbonate
Zinc ore under ultraviolet light
Zinc ore
Cerrusite
Barite on Cerusite I
Barite on Cerusite II
Barite on Cerusite, close
Stibnite
Botryoidal aragonite
Aragonite botryoidal precipitate
Cuprite crystals
Hydrated copper sulphate crystals, SEM
Hematite rock
Galena
Ruby crystal and gems
Sapphire crystal
Dendritic mineral crystals
Manganese oxide, dendritic form
Ironstone matrix with potch opal
Cross-section slice of Brazilian agate
Mass of pyramid-shaped amethyst crystals
Single amethyst crystal, close up
Franklinitein calcite groundmass
Amethyst
Sapphire crystals in rock groundmass