Quartz crystals
Quartz vein
Tourmaline crystals in quartz
Quartz crystal
Smoky quartz crystals
Quartz crystal from Sentis, Switzerland.
Quartz encrusted calcite crystals
Amethyst crystals
Smoky quartz
Quartz mineral
Dendritic crystals in chalcedony
Citrine crystals
Rose quartz mineral, artwork
Pyromorphite specimen
Siderite specimen
Botswana agate stones
Agate slice
Blue lace agate
Amethyst geode interior
Quartz
Quartz mineral stone
Quartz polished stone
Amethyst crystals, light micrograph
Quartz in sphalerite
Quartz crystals, SEM
Galenite and quartz crystals
Chabazite crystals in quartz
Orthoclase and quartz crystals
Raw citrine crystal
Agate mineral rock cross section
Jasp agate stone
Jasp agate polished surface
Egyptian jasper stone
Round agate geode
Round agate thunderegg
Two agate thundereggs
Botswana agate stone
Amethyst filled geode
Agate geode
Moss Agate stone
Banded Amethyst stone
Amethyst
Beryl stone
Chalcopyrite
Garnet gemstone
Jasper polished stone
Geode interior
Green Avanturine Quartz gemstone
Smokey Quartz gemstone
Milky Quartz gemstone
Molybdenite in quartz monzonite
Tiger Eye quartz gemstone
Quartz filled concretion
Tellurium in quartz
Magnetite in quartz
Emerald crystal in quartz
Emerald in quartz
Hawk's Eye quartz stone
Fluorite crystals on quartz, close up
Schorl and quartz crystals in groundmass
Colourful crystals
Quartzite metamorphic rock
Iron oxide precipitation in agate
Dyed agate slice
Amethyst stone
Chiastolite stone
Agate Bridge at Petrified Forest, Arizona
Cut and polished agate
Amethyst and chalcedony
Herkimer diamonds of quartz mineral
Zeolite in quartz
Pyrolusite in quartz
Hessite in quartz
Native gold on quartz
Quartz and cassiterite crystals
Crystals of haematite in quartz
Citrine
Cuprocassiterite in quartz mica schist
Geologist studying a quartz vein
Geologist logging a quartz vein
Specimen of rose quartz from Brazil
Celestite crystals
Calcite crystal
Calcite
Deformed quartz veins in slate
Geode interior section
Quartz crystal mineral
Cut agates
Rhyolitic geode
Slice of agate
Siderite mineral
Pseudomorphic crystal growth
Avanturine smooth gemstone
Beryl gem, cut stone
Schorl tourmaline crystal stone
Green calcite crystal
Tourmaline quartz
Petrified Forest National Park, Arizona
Granite
Cabuchon gemstones of jasper
Amethyst geode
Tourmaline in quartz
Quartz monzonite
Crackle quartz
Quartz vein in granite
Prismatic amethyst crystal
Chalcopyrite and quartz crystals
Mica in quartz, light micrograph
A specimen of quartz
Tourmaline gemstones in quartz
Quartz crystal cluster
Amethyst gemstones
Iron dendrites in agate
Geode in thin section
Native gold
Prasiolite mineral
Silica rock crystal samples
Glacial sand deposit
Graphic granite rock
Jasper
Agate
Banded texture in agate
Jasper breccia rock
Fuchsite mineral stone
Aragonite crystals
Raw amethyst crystal
Opal gem necklace
Jade stone
Labradorite rock crystals
Quartz boulder
Brecciated quartz