Geode in thin section
Slice of agate
Geode interior
Geode interior section
Rhyolitic geode
Cut agates
Amethyst crystals
Geode, thin section micrograph
Polished Esterel rhyolite agate
Amethyst geode
Agate geode
Round agate geode
Amethyst filled geode
Agate, artificially coloured
Agate slice
Agate
Quartz crystals
Tourmaline crystals in quartz
Dendritic crystals in chalcedony
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
Amethyst and chalcedony
Agate surface
Amethyst geode interior
Smoky quartz
Citrine crystals
Quartz crystal
Quartz mineral
Aragonite crystals
Garnet crystal and rock
Brecciated Jasper stone
Yellow Jasper
Kyanite crystal
Labradorite rock crystals
Fire agate
Quartz filled geode
Quartz nodule, polarised light micrograph
Agate lava geode
Raw citrine crystal
Cross-section slice of Brazilian agate
Turritella agate
Amethyst geodes
Calcite crystal
Calcite
Carnelian gemstone
Fuchsite mineral stone
Leopardskin jasper stone
Iron dendrites in agate
Green calcite crystal
Celestite crystals
Banded texture in agate
Herkimer diamonds of quartz mineral
Quartz crystals, SEM
Concentric banding in agate
Quartz vein
Quartz crystal from Sentis, Switzerland.
Quartz
Quartzite metamorphic rock
Pyromorphite specimen
Siderite specimen
Smoky quartz crystals
Rose quartz mineral, artwork
Amethyst crystals, light micrograph
Blue sapphire stone
Blue Sapphire uncut stone
Opal gem necklace
Jade stone
Polished carnelian stone
Red jasper mineral
Spotted Jasper stone
Agate. polarised light micrograph
Citrine gemstones and crystal
Large quartz geode
Blue geode
Dendritic precipitation in an agate
Chalcedony rose
Chalcedony crystals
Mica schist folds, polarised light LM
Quartz crystal structure
Quartz vein in granite
Orange crystal
Raw amethyst crystal
Folded strata in gneiss rock
Rock microveins, light micrograph
Quartzite mineral, light micrograph
Mica schist folds, light micrograph
Rock strain fringes, light micrograph
Granodiorite rock, light micrograph
Melaphyr rock, light micrograph
Granite rock, light micrograph
Agate thunderegg
Agate geode slice
Cut agate
Slice of dyed agate
Azurite copper ore stone
Chrysocolla specimen
Amber citrine quartz stone
Laguna agate
Moctezuma agate
Agua Nueva agate