Siderite mineral
Agate mineral rock cross section
Siderite specimen
Round agate geode
Rose quartz mineral, artwork
Tourmaline crystals in quartz
Prasiolite mineral
Jasp agate stone
Jasp agate polished surface
Egyptian jasper stone
Botswana agate stones
Round agate thunderegg
Two agate thundereggs
Agate slice
Blue lace agate
Botswana agate stone
Amethyst filled geode
Amethyst geode interior
Dyed agate slice
Banded Amethyst stone
Amethyst
Quartz
Quartz crystals
Citrine
Pseudomorphic crystal growth
Quartz in sphalerite
Molybdenite in quartz monzonite
Colourful crystals
Quartz polished stone
Hawk's Eye quartz stone
Tiger Eye quartz gemstone
Avanturine smooth gemstone
Beryl gem, cut stone
Schorl tourmaline crystal stone
Quartz filled concretion
Tellurium in quartz
Quartz encrusted calcite crystals
Quartz vein
Quartz crystal from Sentis, Switzerland.
Fuchsite mineral stone
Iron oxide precipitation in agate
Smoky quartz crystals
Moss Agate stone
Amethyst stone
Beryl stone
Calcite crystal
Calcite
Chalcopyrite
Chiastolite stone
Garnet gemstone
Jasper polished stone
Cut and polished agate
Agate geode
Amethyst and chalcedony
Native gold
Magnetite in quartz
Cuprocassiterite in quartz mica schist
Galenite and quartz crystals
Zeolite in quartz
Pyrolusite in quartz
Hessite in quartz
Emerald crystal in quartz
Chabazite crystals in quartz
Native gold on quartz
Emerald in quartz
Silica rock crystal samples
Orthoclase and quartz crystals
Glacial sand deposit
Graphic granite rock
Granite
Quartz mineral
Quartz monzonite
Herkimer diamonds
Cabuchon gemstones of jasper
Amethyst geode
Amethyst crystals
Mica in quartz, light micrograph
Crystals of haematite in quartz
Quartz vein in granite
Deformed quartz veins in slate
Prismatic amethyst crystal
Elbaite mineral (tourmaline)
Quartz crystal
Raw citrine crystal
Pyromorphite specimen
Quartzite metamorphic rock
Dendritic crystals in chalcedony
Jasper
Jasper breccia rock
Kyanite crystal
Labradorite rock crystals
Opal gem necklace
Jade stone
Schorl and quartz crystals in groundmass
Quartz boulder
Brecciated quartz
Elbaite mineral
Dravite mineral
Andradite mineral
Cassiterite crystal
Quartz and cassiterite crystals
Turritella agate
Amethyst geodes
Carnelian gemstone
Garnet crystal and rock
Yellow Jasper
Leopardskin jasper stone
Quartz mineral stone
Smoky quartz
Citrine crystals
Geode interior
Agate Bridge at Petrified Forest, Arizona
Amethyst crystals, light micrograph
Quartz types
Chalcopyrite and quartz crystals
Geologist studying a quartz vein
Geologist logging a quartz vein
Petrified Forest National Park, Arizona
Quartz crystal mineral
Raw aquamarine crystal
Topaz specimens
Demantoid
Emerald crystal, close up
Olivine peridot crystal, close up
Grossular garnet crystals on rock surface
Sphene crystals in groundmass, close-up
Cursed amethyst
Almandine mineral sample
Olivine mineral sample
Herkimer diamonds of quartz mineral
Blue sapphire stone
Blue Sapphire uncut stone
Aragonite crystals
Brecciated Jasper stone
Fire agate
Quartz mineral stone, light micrograph
Aventurine
Heat-treated amethyst