Fluorite crystals on quartz, close up
Green fluorite cubic crystal twins
Fluorite mineral
Quartz crystals
Fluorite in dolomite
Fluorite crystals
Fluorite
Schorl and quartz crystals in groundmass
Pseudomorphic crystal growth
Twinned fluorite crystals
Orange crystal
Fluorite crystal specimen
Tourmaline crystals in quartz
Smoky quartz crystals
Quartz vein
Quartz encrusted calcite crystals
Mass of pyramid-shaped amethyst crystals
Quartz crystal from Sentis, Switzerland.
Smoky quartz
Quartz crystal
Quartz mineral
Quartz crystals, SEM
Tourmaline quartz
Citrine crystals
Tourmaline in quartz
Rose quartz mineral, artwork
Elbaite on albite and quartz
Rhyolitic geode
Geode, thin section micrograph
Amethyst crystals
Fluorspar crystals
Dendritic crystals in chalcedony
Amethyst crystals, light micrograph
Quartzite metamorphic rock
Cross-section slice of Brazilian agate
Single amethyst crystal, close up
Pyrolusite in quartz
Fluorite crystal
Galenite and quartz crystals
Chabazite crystals in quartz
Orthoclase and quartz crystals
Quartz filled concretion
Quartz vein in granite
Purple fluorite crystals
Flourite crystal, Kirlian photograph
Crystals of haematite in quartz
Deformed quartz veins in slate
Herkimer diamonds of quartz mineral
Quartz
Cut agates
Geode interior
Geode interior section
Geode in thin section
Slice of agate
Amethyst
Flourite crystals
Raw amethyst crystal
Raw citrine crystal
Agate geode
Pyromorphite specimen
Siderite specimen
Iron oxide precipitation in agate
Blue sapphire stone
Blue Sapphire uncut stone
Opal gem necklace
Jade stone
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
Agate slice
Blue lace agate
Botswana agate stone
Dyed agate slice
Moss Agate stone
Amethyst geode
Amethyst stone
Banded Amethyst stone
Beryl stone
Chalcopyrite
Chiastolite stone
Garnet gemstone
Jasper polished stone
Amethyst filled geode
Agate Bridge at Petrified Forest, Arizona
Cut and polished agate
Amethyst geode interior
Amethyst and chalcedony
Calcite on amethyst
Prismatic amethyst crystal
Concentric banding in agate
Calcite crystal
Calcite
Labradorite rock crystals
Citrine
Cubic fluorite
Chalcopyrite and quartz crystals
Fluorite and barite crystals
Quartz filled geode
Fuchsite mineral stone
Heat-treated amethyst
Magnetite in quartz
Quartz in sphalerite
Molybdenite in quartz monzonite
Zeolite in quartz
Quartz polished stone
Tiger Eye quartz gemstone
Tellurium in quartz
Hessite in quartz
Emerald crystal in quartz
Native gold on quartz
Emerald in quartz
Quartz crystal cluster
Mica in quartz, light micrograph
Cuprocassiterite in quartz mica schist
Hawk's Eye quartz stone
Geologist studying a quartz vein
Geologist logging a quartz vein
Colourful crystals
Native gold
Granite
Graphic granite rock