Chalcopyrite and quartz crystals
Cobaltite and chalcopyrite crystals
Chalcopyrite
Chalcopyrite mineral
Sphalerite & chalcopyrite
Pseudomorphic crystal growth
Cuprocassiterite in quartz mica schist
Chalcosite
Tetrahedrite
Sylvanite crystals
Tetrahedrite mineral specimen
Hydrothermal quartz vein
Magnetite in quartz
Chalcopyrite, SEM
Covellite, thin section micrograph
Sphalerite and pyrite
Barite and chalcopyrite crystals
Quartz crystals
Arsenopyrite crystals, close-up
Pyrrhotite crystals, close-up
Glaucodot crystals in groundmass
Smoky quartz crystals
Mining core sample, Kenya
Pyrolusite in quartz
Tourmaline crystals in quartz
Galenite and quartz crystals
Chabazite crystals in quartz
Quartz encrusted calcite crystals
Orthoclase and quartz crystals
Crystals of haematite in quartz
Quartz
Pyrite interspersed with quartz
Covelline
Sulphur crystals
Pyrite crystals
Chalcocite crystals
Iron pyrite crystals
Aragonite crystals with sulphur
Celestine crystals in sulphur groundmass
Bismuthinite crystals in rock groundmass
Arsenopyrite
Pyrite crystals in their host rock
Rose quartz mineral, artwork
Pyritohedral crystals, close up
Hyacinth quartz
Beryl stone
Aragonite crystals
Amethyst crystals
Quartz in sphalerite
Molybdenite in quartz monzonite
Zeolite in quartz
Quartz polished stone
Tiger Eye quartz gemstone
Quartz filled concretion
Tellurium in quartz
Hessite in quartz
Emerald crystal in quartz
Quartz vein in granite
Native gold on quartz
Emerald in quartz
Chalcopyrite specimen
Labradorite rock crystals
Mica in quartz, light micrograph
Hawk's Eye quartz stone
Deformed quartz veins in slate
Colourful crystals
Tennantite
Bournonite
Quartz and cassiterite crystals
Quartz vein
Quartz types
Bismuthinite
Realgar and orpiment
Crystalline sulphur
Iron pyrite
Sulphur crystal
Cobaltine mineral, cobalt ore
Bornite, close-up
Cinnabar on rock surface, close-up
Molybdenite in granite groundmass
Stibnite
Marcasite in chalk groundmass, close-up
Lump of yellow sulphur
Rutilated quartz
Quartz crystal from Sentis, Switzerland.
Pyrite
Quartz mineral stone, light micrograph
Chalcopyrite crystals
Pyrite and quartz, crystalline
Amethyst
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 geode
Round agate thunderegg
Two agate thundereggs
Turritella agate
Agate slice
Blue lace agate
Botswana agate stone
Dyed agate slice
Moss Agate stone
Amethyst geode
Amethyst geodes
Amethyst stone
Banded Amethyst stone
Calcite crystal
Calcite
Chiastolite stone
Carnelian gemstone
Fuchsite mineral stone
Garnet gemstone
Garnet crystal and rock
Jasper polished stone
Brecciated Jasper stone
Yellow Jasper
Kyanite crystal
Leopardskin jasper stone
Amethyst filled geode
Cut and polished agate
Agate geode
Amethyst geode interior
Amethyst and chalcedony
Fire agate
Citrine
Native gold
Siderite mineral
Prasiolite mineral
Avanturine smooth gemstone
Beryl gem, cut stone
Schorl tourmaline crystal stone
Silica rock crystal samples
Glacial sand deposit
Graphic granite rock
Granite