Rhyolitic geode
Geode interior
Geode interior section
Polished Esterel rhyolite agate
Cut agates
Slice of agate
Geode in thin section
Amethyst crystals
Fuchsite mineral stone
Amethyst geode
Agate geode
Round agate geode
Amethyst filled geode
Agate, artificially coloured
Agate slice
Polished sphere of ocean jasper
Orbicular jasper
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 thunderegg
Two agate thundereggs
Blue lace agate
Botswana agate stone
Dyed agate slice
Moss Agate stone
Amethyst stone
Banded Amethyst stone
Amethyst
Beryl stone
Chalcopyrite
Chiastolite stone
Garnet gemstone
Jasper polished stone
Agate Bridge at Petrified Forest, Arizona
Cut and polished agate
Geode, thin section micrograph
Cross-section slice of Brazilian agate
Turritella agate
Agate surface
Aragonite crystals
Garnet crystal and rock
Brecciated Jasper stone
Yellow Jasper
Kyanite crystal
Labradorite rock crystals
Fire agate
Agate lava geode
Quartz filled geode
Rhyolite
Green calcite crystal
Celestite crystals
Agate
Banded texture in agate
Amethyst geodes
Calcite crystal
Calcite
Carnelian gemstone
Leopardskin jasper stone
Iron dendrites in agate
Rhyolite mountain, Iceland
Rhyolite, light micrograph
Granite
Polished sphere of orbicular jasper
Dendritic crystals in chalcedony
Amethyst and chalcedony
Dendritic precipitation in an agate
Basaltic dyke rock
Amethyst geode interior
Spotted Jasper stone
Agate. polarised light micrograph
Quartz crystals
Quartz vein in granite
Concentric banding in agate
Large quartz geode
Agate thunderegg
Agate stone cross section and patterns
Flame agate stone pattern
Agate stone patterns
Three calcite crystals
Quartzite metamorphic rock
Rhyolitic nodule
Mica schist folds, light micrograph
Melaphyr rock, light micrograph
Brown granite stone
Graphic granite rock
Agate with round centre
Cut agate
Slice of dyed agate
Azurite copper ore stone
Chrysocolla specimen
Amber citrine quartz stone
Laguna agate
Moctezuma agate
Agua Nueva agate
Cryptocrystalline agate
Thunder egg agate
Fortification agate
Mineral precipitate in agate
Sard Onyx layered Agate
Quartz crystals, SEM
Smoky quartz
Citrine crystals
Quartz crystal
Herkimer diamonds of quartz mineral
Quartz mineral
Tourmaline crystals in quartz
Blue geode
Cut and polished septarian nodule
Mica schist folds, polarised light LM
Raw citrine crystal
Pyromorphite specimen
Siderite specimen
Smoky quartz crystals
Rose quartz mineral, artwork