Chrysocolla
Malachite
Brochantite
Chrysocolla mineral
Malachite and chrysocolla minerals
Silver wire, mine specimen
Quartz crystal cluster
Cornetite mineral on chrysocolla
Cuprite crystals
Chrysocolla specimen
Chrysocolla, macrophotograph
Chrysocolla, Arizona, USA
Chrysocolla with azurite
Polished vivid blue chrysocolla pebble
Chrysocolla in groundmass, close-up
Cave of Swords, Naica Mine, Mexico
Chrysocolla, a minor ore of Copper
Manganosite
Azurite on Chrysocolla substrate
Copper oxide crystals, SEM
Polished Chrysocolla cabochons
Gypsum crystal group
Botryoidal hematite
Cave of Crystals, Naica Mine, Mexico
Malachite, SEM
Sapphire mining, Madagascar
Malachite in host rock
Azurite in host rock
Azurite
Azurite and malachite
Mineral exploration drilling, Kenya
Diamond drill bit
Mining core samples, Kenya
Mining core sample, Kenya
Banded iron formation
Venetia Diamond Mine, South Africa
Diamond processing, Siberia, Russia
Sulphur rocks
Gold core sample
Ruby
Pyrolusite in quartz
Ruby crystal and gems
Sapphire crystal
Dendritic mineral crystals
Ruby crystals, SEM
Ironstone matrix with potch opal
Cross-section slice of Brazilian agate
Mass of pyramid-shaped amethyst crystals
Single amethyst crystal, close up
Franklinitein calcite groundmass
Sapphire crystals in rock groundmass
Hematite crystals
Rubies and sapphire
Galenite cubes
Sulphur deposits, Mount Iwo, Japan
Bauxite
Diamond miners, South Africa
Manganese oxide, dendritic form
Galena
Entrance to Naica Mine crystal caves
Volcanic crater lake with sulphur deposits
Men carrying mined sulphur from volcanic crater
Zebraite
Desert rose barite
Dioptase mineral sample
Cordierite
Fluorite in dolomite
Tufa rock formation
Oil Shale specimen
Copper Ore
Siderite, and iron ore
Fossil Cystoid
Slate mining
Opencast coal mine
Copper mine mill, Arizona, USA
Synthetic gemstones
Spine crystals in quartz groundmass
Pyrite and quartz, crystalline
Haematite, SEM
Amethyst
Dendritic mineralisations in chalcedony
Quartz coated with silica
Turquoise embedded in iron oxide
Rough Diaspore
Siderite and calcite
Microlite crystals in groundmass
Chromite in serpentinite groundmass
Cuprite crystals, close-up
Cubic perovskite crystals in groundmass
Cassiterite crystals in groundmass
Selenite crystal from Cave of Crystals
Fluorapatite crystal, SEM
Iron pyrites
Fluorite crystals
Apatite crystal
Twinned staurolite crystals
Malachite mineral sample
Cobalt calcite mineral sample
Selenite mineral sample
Thulite mineral
Berzeliite mineral
Twinned fluorite crystals