Lapis lazuli, SEM
Lapis lazuli crystals I
Lapis lazuli crystals II
Lapis lazuli
Lapis lazuli specimen
Lapis lazuli crystals
Polished lapis lazuli stone
Quartz coated with silica
Belt-hook carved in lapis lazuli
Grey limestone and iron oxide
Black tourmaline, SEM
Iron pyrite crystal, SEM
Rhodochrosite and pyrite
Necklace of lapis lazuli
Gneiss with garnet, light micrograph
Lapis lazuli, a rare, deep blue gemstone
Lazurite crystals in a matrix of calcite
Rock strain fringes, light micrograph
Iron pyrite crystals, SEM
Tourmaline crystal, thin section
Hydrothermal quartz vein
Emerald
Gneiss with garnet
Almandine
Fluorite crystals
Banded iron ore
Pyrite
Pyrite crystals
blue apatite
Pink beryl crystal, SEM
Quartz crystals, SEM
Quartz crystal, SEM
Citrine
Lazurite
Garnet
Cut Pyrope gemstone
Cut Watermelon Tourmaline gemstone
Rare bright green Uvarovite Garnet
Yellow-green Tourmaline rough
Trillion cut tourmaline gemstone
Cut green Paraiba Tourmaline gemstone
Pyritohedral crystals, close up
Pyrite mineral stone
Concentric banding in agate
Prehnite and okenite
Iron pyrite, light micrograph
Raw garnet crystal
Yellow crystal
Fire Opal
Oxynoticeras ammonite fossil
Fossil ammonite
Uncut emeralds
Iron pyrite
Pyrite interspersed with quartz
Calcite bladed crystals
Quartz and pyrite
Sphalerite and pyrite
Slate with pyrite
Iron pyrite crystals
Marcasite.
Andelusite crystals in slate
Marcasite
Pyrite crystals in their host rock
Arsenopyrite crystals
Ammonite fossil
Iron pyrites
Octahedral crystals of Pyrite
Orpiment on pyrite
Sample of pyrite
Cut green Tourmaline gemstone
Cut pink Topaz gemstone
Tourmaline cross section
Emerald, SEM
Amethyst, SEM
Microdiamond crystal
Cut pink topaz gemstone
Tourmaline unworked stones
Ruby crystals, SEM
Basalt, light micrograph
Iron pyrite crystal
Jarosite on rock
Deformation structure in schist
Ruby in zoisite
Zircon crystals on host rock
Lazurite birthstone
Cut Cordierite (Iolite) gemstone
Cut Kyanite gemstone
Cut Scapolite gemstone
Rough pinkish-red Rubellite
Tourmaline
Tourmaline on quartz
Calcium carbonate crystals, SEM
Tarquoise.
Turquoise specimen and polished stone
Turquoise mineral
Turquoise
Polished turquoise stone
Turquoise gemstones
Turquoise gemstone
Turquoise stones
Turquoise on rock surface, close-up
Polished and cut turquoise
String of pyrite cubes
Cluster of pyrite cubes
Calcite crystal
Calcite
Quartz encrusted calcite crystals
Galenite in pyrite
Tuff volcanic rock and mineral deposits
Twinned augite crystals
Lizardite in serpentine rock
Sample of feldspar
Pallasite meteorite fragment
Agate
Chalcedony
Iron pyrite cubic crystals in matrix, collected at Mina Victoria, Navajun La Rioja, Spain
Marcasite stepped crystals
Pyrite with Hematite, Italy
Pyrite crystals, New Mexico, USA
Pyrite Sun
Pyrite crystals, Spain
Pyrite crystals on Shale
Pyrite crystals, Peru, South America
Pyrite Stalagtite
Quartz and Pyrite crystals
Sample of the mineral pyrite.
Chalcopyrite specimen