Obsidian
Obsidian flow
Obsidian, a glassy igneous rock
Mahogany obsidian
Obsidian bubbles
Snowflake obsidian
Obsidian mineral stone
Density of pumice and obsidian
Obsidian lava
Obsidian rock
Obsidian dome
Obsidian-rich lava flow, Tenerife
Pebbles of snowflake obsidian rock lying on sand
Obsidian specimen
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
Titanite bearing granite
Garnet
Graphic granite rock
Peridotite
Garnet in peridotite
Granite
黒曜石
Polished sphere of ocean jasper
Tourmaline Pegmatite
Tourmaline pegmatite
Quartz-feldspar porphyry
Pink tourmaline crystals growing on mica
Crystals of green toumaline and pink lepidolite
Aquamarine crystals
Asscher cut diamond gemstone
Pink diamonds
Jasper
Tiger eye
Quartz monzonite
Quartz boulder
Brecciated quartz
Herkimer diamonds
Jasper breccia rock
Quartz vein in granite
Sample of biotite
Brazilianite crystals
Green Tourmaline in Muscovite, Maine
Amphibolite, light micrograph
Muscovite crystals in rock groundmass
Polished sphere of orbicular jasper
Brazilianite crystals in calcite
Muscovite mineral sample
Basaltic dyke rock
Cut and polished septarian nodule
Sample of muscovite
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
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
Cordierite crystal
Olivine mineral sample
Fluorite
Gemstones, composite image
Polished Esterel rhyolite agate
Orthogneiss, light micrograph
TOLOWA dancing head-dress 1923
Rough diamond
Hawk's Eye
Tiger's Eye
Granite specimen
Devonian slates
Diamond in kimberlite
Geode, thin section micrograph
Opalised fossil
Deformed quartz veins in slate
Raw aquamarine crystal
Imperial Jade streaked with green
Ironstone matrix with potch opal
Prismatic amethyst crystal
Potch opal with smooth and rough surface
Grossular garnet crystals on rock surface
Turquoise on rock surface, close-up
Elbaite mineral (tourmaline)
Five polished ruby gemstones
Lapis lazuli specimen
Chrysocolla
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