Wulfenite
Wulfenite crystals
Cassiterite tin ore
Quartz and pyrite
Wulfenite crystals in dark groundmass
Pyrite on quartz
Amethyst crystals
Molybdenite mineral, molybdenum ore
Wulfenite mineral
Molybdenite
Cubic perovskite crystals in groundmass
Andradite
Light reflection
Autunite crystals, close-up
Sulphur crystal
Periklin crystals
Hedyphane
Pyrolusite
Calcite crystals
Hessonite
Mercury
Arsenic
Soap films on a pyramid
Molybdenite in pegmatite
Crystalline sulphur
Lump of yellow sulphur
Ullmannite mineral crystals
Rhombohedral siderite crystals
Zircon crystals on host rock
Vanadinite crystals
Microdiamond crystal
Cluster of pyrite cubes
Grossular
Crystalline manganese, SEM
Prismatic Piemontite crystals
Fibrous sillimanite
Prismatic crocoite crystals
Lizardite crystal
Purple-blue geode
Enargite mineral
Stephanite crystals, close-up
Adamite mineral
Garnierite crystals on rock surface
Cyanotrichite crystals on rock surface
Strontianite mineral
Polybasite crystals, close-up
Datolite crystals, close-up
Pectolite crystals
Albite crystals, close-up
Quartz crystals
Tourmaline crystals in quartz
Smoky quartz crystals
Rhodochrosite mineral
Dodecahedral crystal of spessartine
Quartz coated with silica
Spinel in Schist
Molybdenum, Arizona, USA
Halite hopper crystals
Red calcite crystals
Pyrrhotite crystals, close-up
Antimony, close-up
Heulandite in rock groundmass, close-up
Cinnabar on rock surface, close-up
Cobaltite and chalcopyrite crystals
Glaucodot crystals in groundmass
Borax (Sodium tetraborate decahydrate)
Bismuthinite crystals in rock groundmass
Calcium carbonate precipitation
Diaspore crystals in emery groundmass
Ankerite crystals in groundmass, close-up
Daisy Gypsum
Magnesite crystals in groundmass
Franklinitein calcite groundmass
Artinite crystals in rock groundmass
Microlite crystals in groundmass
Chromite in serpentinite groundmass
Crystalline brucite in groundmass
Carnallite, close-up
Chalcanthite crystals in rock groundmass
Anatase mineral (titanium oxide)
Atacamite and malachite crystals
Manganite crystals, close-up
Boleite crystals in gypsum groundmass
Cuprite crystals, close-up
Stibiconite
Nitratine mineral (sodium nitrate)
Jamesonite
Feldspar and quartz
Kyanite
Wavellite
Diaspore
Copper sulphate crystal
Sodalite glowing yellow in UV light
Fluorite crystals
Apatite crystal
Twinned staurolite crystals
Malachite mineral sample
Cobalt calcite mineral sample
Selenite mineral sample
Thulite mineral
Berzeliite mineral
Twinned fluorite crystals
Clinochlore
Chromite
Apatite crystals
Fluorspar crystals
Kyanite mineral
Torbernite
Scolecite mineral
Selenite crystals
Porphyritic texture in an igneous rock
Prehnite and okenite minerals
Calcite spherulites
Childrenite crystal in quartz
Heulandite crystal
Analcime or analcite crystal
Baryte crystals
Prismatic parallel crystals of allanite
Willemite crystal
Prismatic beryl crystal
Bladed radial form of desert rose gypsum
Monazite crystal
Ilvaite crystal
Dolomite in Quartz Groundmass
Milky Quartz
Clinochlore crystals in rock groundmass
Witherite mineral in crystal form
Rock Crystal
Aegirine crystal in rock groundmass
Mercury, close-up
Smoky Quartz in Milky Quartz Groundmass
Riebeckite crystals in groundmass
Astrophyllite
Pyrargyrite crystals, close-up
Microcline in rock groundmass
Axinite
Uvarovite crystals
Sulphur crystals
Analcime crystal group
Cube-forming galena, close-up
Graphite
Iron pyrite
Iron pyrite crystals
Chalcopyrite and quartz crystals
Aragonite crystals with sulphur
Vanadinite mineral sample
Scapolite mineral sample
Apophyllite crystals
Beryl stone
Graphite on calcite crystals
Apophyllite on calcite
Pyrite crystals in their host rock
Pyrite crystals
Chalcocite crystals
Crushed diamond, SEM
Cobaltine mineral, cobalt ore