Calcite
Calcite crystal
Quartz encrusted calcite crystals
Sylvanite crystals
Calcite crystals
Coral calcite crystals
Silver crystals in calcite
Brazilianite crystals in calcite
Magnetite and calcite
Graphite on calcite crystals
Apophyllite on calcite
Pink calcite crystals
Scalenohedral calcite crystals
Concentric banding in agate
Iron oxide precipitation in agate
Agate mineral rock cross section
Jasp agate stone
Jasp agate polished surface
Cabuchon gemstones of jasper
Egyptian jasper stone
Botswana agate stones
Round agate geode
Round agate thunderegg
Two agate thundereggs
Turritella agate
Agate slice
Blue lace agate
Botswana agate stone
Dyed agate slice
Moss Agate stone
Amethyst geode
Amethyst geodes
Amethyst stone
Banded Amethyst stone
Amethyst
Aragonite crystals
Beryl stone
Chalcopyrite
Chiastolite stone
Carnelian gemstone
Fuchsite mineral stone
Garnet gemstone
Garnet crystal and rock
Jasper polished stone
Brecciated Jasper stone
Yellow Jasper
Kyanite crystal
Labradorite rock crystals
Leopardskin jasper stone
Cut and polished agate
Amethyst filled geode
Agate geode
Fire agate
calcite veining in limestone
Calcite crystal rosettes
Pseudomorphic crystal growth
Cut and polished septarian nodule
Zincite in fraklinite
Septarian nodule
Calcium carbonate precipitation
Septarian nodule surface
Spotted Jasper stone
Agate. polarised light micrograph
Red calcite crystals
Agate
Calcite globules
Scalenohedral calcite, close-up
Crenulation cleavage in calcite
Calcite crystal group
Skalenoedric calcite crystals
Red calcite, Mexico
Macrophotograph of crystals of calcite
Aragonite floral crystals
Gypsum stone
Amethyst and chalcedony
Banded calcite \Onyx\" II"
Green calcite crystal
Cut agates
Geode interior
Rhyolitic geode
Geode interior section
Slice of agate
Agate Bridge at Petrified Forest, Arizona
Iron dendrites in agate
Rutilated quartz
Sample of calcite
Calcite in mudstone
Magnesite crystals in groundmass
Nailhead calcite and galena
Aragonite crystals with sulphur
Flos-ferri aragonite
Aragonite
Chalcedony
Pyrolusite in quartz
Cross-section slice of Brazilian agate
Laguna agate
Moctezuma agate
Agua Nueva agate
Cryptocrystalline agate
Thunder egg agate
Fortification agate
Calcium carbonate crystals, SEM
Celestite crystals
Banded texture in agate
Three calcite crystals
Smoky quartz crystals
Rose quartz mineral, artwork
Amethyst crystals
Amethyst geode interior
Sample of chalk
Sample of limestone
Aragonite-covered crayfish
Zinc ore under ultraviolet light
Zinc ore
Lithographic limestone
Grey limestone and iron oxide
Limestone
Yellow limestone
Geode, thin section micrograph
Blue sapphire stone
Blue Sapphire uncut stone
Opal gem necklace
Jade stone
Double refraction in a calcite crystal