Calcite crystal
Calcite
Quartz encrusted calcite crystals
Sylvanite crystals
Calcite crystal rosettes
Calcite crystals
Kyanite crystal
Garnet crystal and rock
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
Pseudomorphic crystal growth
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
Jasper polished stone
Brecciated Jasper stone
Yellow Jasper
Labradorite rock crystals
Leopardskin jasper stone
Cut and polished agate
Amethyst filled geode
Agate geode
Fire agate
Red calcite crystals
calcite veining in limestone
Agate
Calcite crystal group
Cut and polished septarian nodule
Zincite in fraklinite
Septarian nodule
Calcium carbonate precipitation
Septarian nodule surface
Spotted Jasper stone
Agate. polarised light micrograph
Calcite globules
Scalenohedral calcite, close-up
Banded calcite \Onyx\" II"
Green calcite crystal
Red calcite, Mexico
Crenulation cleavage in calcite
Skalenoedric calcite crystals
Macrophotograph of crystals of calcite
Aragonite floral crystals
Gypsum stone
Amethyst and chalcedony
Cut agates
Geode interior
Rhyolitic geode
Geode interior section
Slice of agate
Agate Bridge at Petrified Forest, Arizona
Iron dendrites in agate
Chalcedony
Rutilated quartz
Orange crystal
Sample of calcite
Calcite in mudstone
Magnesite crystals in groundmass
Nailhead calcite and galena
Calcium carbonate crystals, SEM
Aragonite crystals with sulphur
Flos-ferri aragonite
Aragonite
Double refraction in a calcite crystal
Pyrolusite in quartz
Hollow agate with crystal
Fluorite crystal specimen
Cross-section slice of Brazilian agate
Schorl tourmaline crystal stone
Emerald crystal in quartz
Silica rock crystal samples
Laguna agate
Moctezuma agate
Agua Nueva agate
Cryptocrystalline agate
Thunder egg agate
Fortification agate
Banded calcite \Onyx\" I"
Celestite crystals
Banded texture in agate
Three calcite crystals
Quartz crystal from Sentis, Switzerland.
Smoky quartz crystals
Rose quartz mineral, artwork
Amethyst crystals
Amethyst geode interior
Deformed calcite crystal
Botryoidal aragonite
Aragonite botryoidal precipitate
Geode, thin section micrograph
Blue sapphire stone
Blue Sapphire uncut stone
Opal gem necklace