Obsidian flow
Obsidian
Obsidian, a glassy igneous rock
Mahogany obsidian
Snowflake obsidian
Obsidian mineral stone
Obsidian bubbles
Obsidian-rich lava flow, Tenerife
Obsidian lava
Obsidian rock
Obsidian dome
Pebbles of snowflake obsidian rock lying on sand
Obsidian specimen
Density of pumice and obsidian
Snowflake Obisidian
Mahogany Obsidian, Oregon, USA
Variety of Igneous Rocks
Two-mica granite
Lava landscape
Neolithic stone tool
Emeralds
Snowflake obsidian gemstone on white background
Neolithic stone tools
Fuchsite mineral stone
Rhyolite mountain, Iceland
Quartz vein in granite
Titanite bearing granite
Garnet
Graphic granite rock
Peridotite
Garnet in peridotite
Granite
黒曜石
Polished sphere of ocean jasper
Quartz-feldspar porphyry
Pink tourmaline crystals growing on mica
Crystals of green toumaline and pink lepidolite
Aquamarine crystals
Tourmaline pegmatite
Tourmaline Pegmatite
Jasper
Tiger eye
Quartz monzonite
Quartz boulder
Brecciated quartz
Herkimer diamonds
Jasper breccia rock
Asscher cut diamond gemstone
Pink diamonds
Sample of biotite
Brazilianite crystals
Green Tourmaline in Muscovite, Maine
Amphibolite, light micrograph
Sample of muscovite
Brazilianite crystals in calcite
Muscovite mineral sample
Basaltic dyke rock
Cut and polished septarian nodule
Polished sphere of orbicular jasper
Muscovite crystals in rock groundmass
Black tourmaline in mica schist
Native gold
Quartz and schist outcrops
Cubic zirconia
Hertfordshire puddingstone
Quartz filled concretion
Garnet crystals on schist
Quartz vein in gneiss rock
Almandine crystals in schist
Quartz seam in schist
Topaz crystal in albite and microcline
Emerald crystal, close up
Olivine peridot crystal, close up
Schorl and quartz crystals in groundmass
Sphene crystals in groundmass, close-up
Gneiss with garnet
Quartz mineral stone, light micrograph
Olivine mineral sample
Fluorite
Gemstones, composite image
Orthogneiss, light micrograph
TOLOWA dancing head-dress 1923
Rough diamond
Hawk's Eye
Tiger's Eye
Granite specimen
Devonian slates
Diamond in kimberlite
Opalised fossil
Deformed quartz veins in slate
Cordierite crystal
Raw aquamarine crystal
Rutile crystals
Azurite crystals
Carnelian agate
Quartz
Iron oxide precipitation in agate
Quartz crystals
Smoky quartz crystals
Sample of Labradorite
Andradite crystals
Magnetite in quartz
Cuprocassiterite in quartz mica schist
Citrine
Cut and polished jasper
Opal
Peridot
Siderite mineral
Almandine mineral sample
Nephrite crystals
Moonstone gemstones
Pseudomorphic crystal growth
Titanite crystals in actinolite
Quartz in sphalerite
Molybdenite in quartz monzonite
Galenite and quartz crystals
Agate in amethyst
Laguna agate
Moctezuma agate
Agua Nueva agate
Cryptocrystalline agate
Thunder egg agate
Vein agate
Chrysoprase
Mounted India dendritic agate
Rose quartz mineral, artwork
Colourful crystals
Prasiolite mineral
Zeolite in quartz
Pyrolusite in quartz
Topaz crystals
Pyrope sand
Quartz polished stone
Garnet-bearing rock
Opal gem necklace
Jade stone
Indicolite tourmaline faceted stone
Watermelon tourmaline crystalline stone
Hawk's Eye quartz stone
Tiger Eye quartz gemstone
Avanturine smooth gemstone
Beryl gem, cut stone
Schorl tourmaline crystal stone
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