Dendritic precipitation in an agate
Cut and polished agate
Iron oxide precipitation in agate
Fire agate
Cross-section slice of Brazilian agate
Moss agate
Cut agate
Mineral precipitate in agate
Mineral precipitation in agate
Agate
Pyrolusite in quartz
Agate surface
Agate slice
Slice of agate
Polished Esterel rhyolite agate
Dyed agate slice
Banded texture in agate
Rhyolitic geode
Agate, artificially coloured
Brecciated Agate stone
Turritella agate
Cut agates
Geode interior
Geode interior section
Botswana agate stone
Agate thunderegg
Green calcite crystal
Celestite crystals
Flame agate stone pattern
Agate stone patterns
Agate stone cross section and patterns
Pyrolusite and psilomelane manganese ores
Concentric banding in agate
Laguna agate
Moctezuma agate
Cryptocrystalline agate
Fortification agate
Agate geode
Sard Onyx layered Agate
Slice of dyed agate
Agua Nueva agate
Thunder egg agate
Jasp agate stone
Jasp agate polished surface
Botswana agate stones
Round agate geode
Round agate thunderegg
Two agate thundereggs
Blue lace agate
Moss Agate stone
Iron dendrites in agate
Agate lava geode
Agate mineral rock cross section
Agate Bridge at Petrified Forest, Arizona
Calcite crystal
Calcite
Fuchsite mineral stone
Aragonite crystals
Garnet crystal and rock
Jasper polished stone
Brecciated Jasper stone
Yellow Jasper
Kyanite crystal
Labradorite rock crystals
Dendrites in agate
Three calcite crystals
Chalcedony
Mounted India dendritic agate
Amethyst crystals
Agate. polarised light micrograph
Geode in thin section
Azurite copper ore stone
Chalcopyrite
Chrysocolla specimen
Amber citrine quartz stone
Cabuchon gemstones of jasper
Egyptian jasper stone
Amethyst geode
Amethyst geodes
Amethyst stone
Banded Amethyst stone
Amethyst
Beryl stone
Chiastolite stone
Carnelian gemstone
Garnet gemstone
Leopardskin jasper stone
Amethyst filled geode
Dendritic mineral crystals
Manganese oxide, dendritic form
Smoky quartz crystals
Polished slice of agate
Coloured slices of agate
Sandstone in chalcedony matrix, polarised light micrograph
Agate, variety of mineral quartz
A polished sample of agate
Slice of agate, a form of quartz
Cross section of blue agate, a type of chalcedony
Slice of agate, a chalcedony form of quartz
Vein agate
Carnelian agate
Dendritic crystals in chalcedony
Agate, polarised light micrograph
Agate in amethyst
Spotted Jasper stone
Siberian agate, polarised light micrograph
Amethyst crystals in an agate geode
Thunderegg or Agate Geode
Agate geode slice
Folded strata in gneiss rock
Rock microveins, light micrograph
Thunderegg Geode with Quartz and Agate
Polished sphere of ocean jasper
Turquoise embedded in iron oxide
Botryoidal chalcedony, close-up
Brown granite stone
Panorama in Espumoso