Jasper specimen
Manganocalcite specimen
Lapis lazuli specimen
Pink quartz heart
Agate specimen
Prismatic crocoite crystals
Polished sphere of orbicular jasper
Gneiss
Anatextite gneiss
Malachite on jasper
Iron pyrite
Polished sphere of ocean jasper
Sample of marble
Sample of feldspar
Sample of biotite
Sample of serpentine
Sample of gypsum
Sample of rose quartz
Sample of granulite
Native silver
Obsidian specimen
Ocean jasper agate
Calcite on sphalerite
Datolite crystals
Datolite
Hedyphane
Opal
A lump of translucent agate
Botryoidal hematite
Unakite spheres
Pyromorphite crystals
Dioptase crystals
Sodalite
Axinite
Epidote crystals
Sample of andesite
Cinnabar and mercury
Cinnabar
Surface of the Moon, optical image
Round polished Common Opal
Graphite, New Jersey, USA
Paragneiss
Petrified wood specimen
Jasper
rhodonite gemstone
Glaucophane crystals in rock groundmass
Adamite mineral
Kaolinite
Stone polished axe
Neolithic tools
Assortment of Gemstones
Pyrolusite on aplitic rock specimen
Rough columbite
Limestone specimen
Dolomite specimen
Sample of limestone
Sample of chalk
Sample of gneiss
Sample of coal
Samples of sandstone
Sample of talc
Sample of muscovite
Sample of haematite
Sample of calcite
Bauxite and aluminium
Bauxite
Crystal geode
Amethyst geode
Barite crystals
Asbestos fibres
Quartz crystals
Columnar calcite, fluorescent
Fluorite on quartz crystals
Sodalite glowing yellow in UV light
Syenite
Red jasper mineral
Quartzite specimen
Tourmaline specimen
Loess rough
Quartz porphyry rough
Sepiolite clay mineral
Molybdenite specimen
Haematite specimen
Cabuchon gemstones of jasper
Amygdaloidal andesite
Ammolite gemstone
Oval polished green Chrysoprase
Polished oval Hawk's Eye Quartz
Seymchan pallasite
Barringer Crater rock specimen
Tourmaline crystal specimen
Allende meteorite specimen
Banded iron specimen
Dendritic copper specimen
Labradorite
Milky Quartz
Opal specimen and cut stone
Jasper breccia rock
Carnelia
Tiger's Eye
rose quartz
Jasper, a form of chalcedony, close-up
Azurite crystals
Autunite crystals, close-up
Heulandite crystal
Larimar Pectolite
Prismatic Piemontite crystals
Bentonite
Blue Cavansite rosette in rock groundmass
Yellow cancrinite in syenite
Fibrous sillimanite
Translucent golden copal nugget
Lizardite crystal
Brown nontronite
Purple-blue geode
Wad, close-up
Epsomite, close-up
Enargite mineral
Stephanite crystals, close-up
Annabergite on rock surface, close-up
Garnierite crystals on rock surface
Boulangerite, close-up
Cryolite, close-up
Cyanotrichite crystals on rock surface
Diaboleite on rock surface, close-up
Strontianite mineral
Chamosite in rock groundmass
Polybasite crystals, close-up
Datolite crystals, close-up
Porphyritic trachyte rough
Jamesonite in rock groundmass, close-up
Halloysite, a form of Kaolinite
Pectolite crystals
Polyhalite, close-up
Albite crystals, close-up
Corundum, close-up
Amblygonite on rock surface, close-up
Clay
Selenite crystals
Fluorite and barite crystals
Sample of basalt
Fluorite crystals
Barite and chalcopyrite crystals
Native copper
Gibbsite
Graphite
Double-ended quartz crystal
Amethyst
Blue geode
Emerald
Red crystalline mineral
Red crystal
Bismuth crystals
Yellow Jasper
Aragonite crystals
Granite specimen
Haematite
Cut and polished jasper
Widmanstatten pattern I
Widmanstatten pattern II
Egyptian jasper stone
Spotted Jasper stone
Leopardskin jasper stone
Conichalcite and adamite