Lapis lazuli crystals I
Lapis lazuli crystals II
Lapis lazuli, SEM
Lapis lazuli crystals
Lapis lazuli
Polished lapis lazuli stone
Lapis lazuli specimen
Quartz coated with silica
Lazurite crystals in a matrix of calcite
Necklace of lapis lazuli
Lapis lazuli, a rare, deep blue gemstone
Pyrite
Pyritohedral crystals, close up
Raw garnet crystal
Tourmaline crystal, thin section
Almandine
Belt-hook carved in lapis lazuli
Iron pyrites
Sample of pyrite
Iron pyrite crystals
Iron pyrite crystal
Tourmaline cross section
Rare bright green Uvarovite Garnet
Citrine
Turquoise embedded in iron oxide
Turquoise mineral
blue apatite
Concentric banding in agate
Tourmaline unworked stones
Iron pyrite
Pyrite dodecahedrons II
Pyrite dodecahedrons I
Tourmaline on quartz
Iron pyrite crystal, SEM
Iron pyrite crystals, SEM
String of pyrite cubes
Pyrite crystals, Peru, South America
Chalcopyrite specimen
Marcasite.
Iridescent pyrite in a clay nodule
Andelusite crystals in slate
Pyrite crystals in their host rock
Pyrite crystals
Iron pyrite, light micrograph
Fluorite crystals
Arsenopyrite crystals
Cubic pyrite crystals
Marcasite mineral
Calcite bladed crystals
Sphalerite and pyrite
Pyrite interspersed with quartz
Cluster of pyrite cubes
Marcasite stepped crystals
Lazurite
Prehnite and okenite
Amethyst crystals
Tourmaline
Rough pinkish-red Rubellite
Twinned augite crystals
Ruby in zoisite
Zircon crystals on host rock
Smoky quartz
Pallasite meteorite fragment
Quartz and pyrite
Grey limestone and iron oxide
Malachite and chrysocolla minerals
Rhodochrosite and pyrite
Pyrite mineral stone
Rock strain fringes, light micrograph
Hydrothermal quartz vein
Calcite crystal
Yellow crystal
Black tourmaline, SEM
Emerald
Gneiss with garnet, light micrograph
Gneiss with garnet
Fire Opal
Uncut emeralds
Lazurite birthstone
Mars Science Laboratory instrument
Agate
Chalcedony
Pyrite and quartz, crystalline
Rose Quartz
Turquoise stones
Turquoise specimen and polished stone
Axinite
Chrysocolla mineral
Beryl crystals
Green hemimorphite in groundmass
Banded iron ore
Octahedral crystals of Pyrite
Orpiment on pyrite
Apophyllite crystals
Turquoise Crystal Gemstone
Rubies and sapphire
Ammonite, pyritized
Rock Types
Pyritized ammonite
Arsenopyrite with siderite and pyrite crystals
Garnet
Cut green Tourmaline gemstone
Cut Pyrope gemstone
Cut Watermelon Tourmaline gemstone
Yellow-green Tourmaline rough
Trillion cut tourmaline gemstone
Cut green Paraiba Tourmaline gemstone
Cut pink Topaz gemstone
Jarosite on rock
Cut Scapolite round gemstone
Rhodonite
Pink beryl crystal, SEM
Crystals inside dinosaur fossils
Rutilated quartz
Ruby
Sapphire crystal
Marcasite in chalk groundmass, close-up
Sample of the mineral pyrite.
Tarquoise.
Polished turquoise stone
Turquoise gemstones
Turquoise gemstone
Turquoise
Tuff volcanic rock and mineral deposits
Cut pink topaz gemstone
Tetrahedrite
Stibnite
Stilbite crystal group
Scolecite
Quartz in sphalerite
Hornblende crystals
Microcline mineral
Pyroxene crystal, thin section
Quartz crystals, SEM
Kyanite
Diamonds
Cut Kyanite gemstone
Aventurine
Large ruby slice
Ruby crystal and gems
Ironstone matrix with potch opal
Mass of pyramid-shaped amethyst crystals
Single amethyst crystal, close up
Unpolished topaz crystals
Septarian nodule surface
Calcite
Quartz encrusted calcite crystals
Flourite crystal, Kirlian photograph
Fayalite
Galenite in pyrite
Pyrite bead necklace