Sand, SEM
Amethyst, SEM
Mica in quartz, light micrograph
Rose quartz crystals, SEM
Jasper
Jasper breccia rock
Quartz monzonite
Quartz boulder
Brecciated quartz
Herkimer diamonds
Quartzite mineral, light micrograph
Agate. polarised light micrograph
Quartz crystals, SEM
Microdiamond crystal
Jasper, polarised light micrograph
Sand grains, SEM
Tourmaline crystals in quartz
Quartz crystals
Sand
Pile of sand
Glacial sand deposit
Cat litter, SEM
Mica schist folds, light micrograph
Granodiorite rock, light micrograph
Melaphyr rock, light micrograph
Malachite, SEM
Graphic granite rock, light micrograph
Iron oxide precipitation in agate
Smoky quartz crystals
Cut and polished jasper
Laguna agate
Moctezuma agate
Agua Nueva agate
Cryptocrystalline agate
Thunder egg agate
Vein agate
Chrysoprase
Rose quartz mineral, artwork
Agate mineral rock cross section
Jasp agate stone
Jasp agate polished surface
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 stone
Banded Amethyst stone
Amethyst
Beryl stone
Calcite crystal
Calcite
Chalcopyrite
Chiastolite stone
Garnet gemstone
Jasper polished stone
Amethyst filled geode
Fortification agate
Agate
Cut and polished agate
Agate geode
Amethyst geode interior
Cursed amethyst
Concentric banding in agate
Amethyst and chalcedony
Quartz mineral stone
Quartz polished stone
Green Avanturine Quartz gemstone
Smokey Quartz gemstone
Milky Quartz gemstone
Green calcite crystal
Celestite crystals
Specimen of rose quartz from Brazil
Banded texture in agate
Rutile crystals
Quartz
Native gold
Magnetite in quartz
Cuprocassiterite in quartz mica schist
Citrine
Siderite mineral
Quartz and schist outcrops
Pseudomorphic crystal growth
Quartz in sphalerite
Molybdenite in quartz monzonite
Galenite and quartz crystals
Colourful crystals
Prasiolite mineral
Zeolite in quartz
Pyrolusite in quartz
Hertfordshire puddingstone
Hawk's Eye quartz stone
Tiger Eye quartz gemstone
Avanturine smooth gemstone
Beryl gem, cut stone
Schorl tourmaline crystal stone
Quartz filled concretion
Aventurine
Tellurium in quartz
Hessite in quartz
Emerald crystal in quartz
Quartz vein in gneiss rock
Chabazite crystals in quartz
Native gold on quartz
Emerald in quartz
Quartz encrusted calcite crystals
Silica rock crystal samples
Two-mica granite
Orthoclase and quartz crystals
Red sandstone
Red and white sandstone
Conglomerate rock
Quartz seam in schist
Graphic granite rock
Granite
Quartz stalactites
Aventurine gemstone
Garnets in micaschist, light micrograph
Amethyst gemstones
Quartz vein
Quartzite rocks
Quartzite rocks covered in lichens
Tiger's eye mineral, light micrgraph
Mylonite, light micrograph
Mica inclusion
Quartz crystal from Sentis, Switzerland.
Quartz crystal mineral
A specimen of quartz
Pietersite semi-precious rock
Crackle quartz
Quartz mineral stone, light micrograph
Gneiss, thin section, polarised LM
Citrine.
Citrine crystals
Rock strain fringes, light micrograph
Granite rock, light micrograph
Aragonite crystals
Cabuchon gemstones of jasper
Amethyst geode
Fuchsite mineral stone