Devonian slates
Quartz vein in granite
Granite specimen
Graphic granite rock
Granite
Quartz mineral stone, light micrograph
Ancient Roman columns
Granite rock, light micrograph
Coastal rocks and pebbles
Graphic granite rock, light micrograph
Titanite bearing granite
Graphic tourmaline, light micrograph
Red sandstone
Deformed quartz veins in slate
Zircon crystals on host rock
Luxulyanite, thin section, LM
Rock types
Rough topaz
Molybdenite in granite
Microcline
Molybdenite in granite groundmass
Amazonite
Brixen granite
Granite, light micrograph
Granodiorite, light micrograph
Granodiorite
Variety of Igneous Rocks
Obsidian lava
Obsidian rock
Fuchsite mineral stone
Red and white sandstone
Two-mica granite
Rhyolite mountain, Iceland
Brown granite stone
Sample of granite
Muscovite and feldspar
Yellow Pollucite in coarse granite
Granite, polarised light micrograph
Aplite, polarised light micrograph
Forbach granite
Quartz and schist outcrops
Hertfordshire puddingstone
Quartz filled concretion
Devonian Old Red Sandstone quartz conglomerate, Gower, UK
Jasper
Jasper breccia rock
Cubic zirconia
Quartz monzonite
Quartz boulder
Brecciated quartz
Herkimer diamonds
Peridotite, polarised light micrograph
Garnet
Diamond in kimberlite
Peridotite
Garnet in peridotite
Granite Tor on Bodmin Moor
Porphyritic microgranite
Muscovite, polarised light micrograph
Forbach granite, light micrograph
Turritella agate
Aplite, light micrograph
Brixen granite, light micrograph
Sigillaria plant fossil
Cyclostigma plant fossil
Diamond blade saw cutting through granite
Native gold
Quartz vein in gneiss rock
Quartz seam in schist
Quartz-feldspar porphyry
A weathered granite boulder
花崗岩
御影石
Polished sphere of ocean jasper
Orthogneiss, light micrograph
Emerald in host rock
Rhyolitic geode
Quartz crystals
Rose quartz crystals, SEM
Amethyst
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
Cabuchon gemstones of jasper
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 geode
Amethyst geodes
Amethyst stone
Banded Amethyst stone
Aragonite crystals
Beryl stone
Calcite crystal
Calcite