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