Beryl crystals
Pink beryl crystal, SEM
Quartz crystals, SEM
Quartz crystal, SEM
Axinite
Chrysocolla mineral
Apophyllite crystals
Citrine
Concentric banding in agate
Quartz coated with silica
Apophyllite on calcite
Zircon crystals on host rock
Malachite and chrysocolla minerals
Prismatic beryl crystal
Hornblende crystals
Aragonite crystals
Malachite crystals, SEM
Rose Quartz
Tourmaline
Tourmaline on quartz
Sample of feldspar
Lizardite in serpentine rock
Almandine
Rare bright green Uvarovite Garnet
Kyanite
Emerald
Twinned augite crystals
Agate
Chalcedony
Microcline mineral
Tourmaline unworked stones
Feldspar and quartz
Pyroxene crystal, thin section
Smoky quartz
Quartz encrusted calcite crystals
Pallasite meteorite fragment
Pseudomorphic crystal growth
Septarian nodule
Calcite crystals
Aragonite crystals with sulphur
Graphite on calcite crystals
Raw garnet crystal
Tourmaline crystal, thin section
Rough pinkish-red Rubellite
Uncut emeralds
Coral calcite crystals
Brazilianite crystals in calcite
Pink calcite crystals
Scalenohedral calcite crystals
Magnesite crystals in groundmass
Sample of muscovite
Gneiss with garnet
Beryl gem, cut stone
Fluorite crystals
Prehnite and okenite
Beryl in rock groundmass, close-up
Stilbite crystal group
Zinnwaldite mineral group
Tourmaline cross section
Ruby in zoisite
Silver crystals in calcite
Emerald crystal in quartz
Emerald in quartz
Rough emeralds
Magnetite and calcite
Flos-ferri aragonite
Gypsum stone
Cut and polished septarian nodule
Calcite
Zincite in fraklinite
Calcium carbonate precipitation
Aragonite
Cerussite
Scalenohedral calcite, close-up
Scolecite
Scapolite crystals in rock groundmass
Scapolite mineral sample
Asbestos veins in serpentinite
Graphite
Barytocalcite crystals in rock groundmass
Artinite crystals in rock groundmass
Chalcanthite crystals in rock groundmass
Ankerite crystals in groundmass, close-up
Enstatite
Diamond in host rock
Amethyst crystals
Sphalerite crystals
Sulphur crystals
Pyrite crystals
Chalcocite crystals
Beryl stone
Clinochlore
Chromite
Kyanite mineral
Prehnite and okenite minerals
Stibnite
Hydrated copper sulphate crystals
Pyrite crystals in their host rock
Gneiss with garnet, light micrograph
Calcite crystal
Lapis lazuli, SEM
Stilbite crystals
Selenite crystals
Scapolite crystals
Dendritic mineral crystals
Atacamite and malachite crystals
Apatite crystals
Fluorspar crystals
Baryte crystals
Twinned staurolite crystals
Twinned fluorite crystals
Hydrated copper sulphate crystals, SEM
Flourite crystals
Rhombohedral siderite crystals
Fire Opal
Skalenoedric calcite crystals
Raw aquamarine crystal
Emeralds
Emerald crystal, close up
Celestine crystals in sulphur groundmass
Macrophotograph of crystals of calcite
Rutilated quartz
Nailhead calcite and galena
Anatase mineral (titanium oxide)
Linarite in rock groundmass, close-up
Lapis lazuli crystals I
Lapis lazuli crystals II
Chalcopyrite, SEM
Azurite crystals, SEM
Scolecite crystals
Nephrite crystals
Tremolite crystals
Colourful crystals
Pyrargyrite crystals
Celestine crystals
Fluorite in dolomite
Moss agate
Titanite crystals in actinolite