Chalcedony
Arnold Fisher/science Photo Library
Coyamito Agate
Natural History Museum, London/science Photo Library
Agate - A Cryptocrystalline Variety Of Quartz.
Sinclair Stammers/science Photo Library
Polished Slice Of Agate
Vaughan Fleming/science Photo Library
Slice Of Agate
Vaughan Fleming/science Photo Library
Chalcedony
Pascal Goetgheluck/science Photo Library
Chalcedony Open Geode
Science Stock Photography/science Photo Library
Chalcedony
Science Stock Photography/science Photo Library
Chalcedony #1
Science Stock Photography/science Photo Library
Agate #8
Natural History Museum, London/science Photo Library
Agate
Natural History Museum, London/science Photo Library
Agua Nueva Agate
Natural History Museum, London/science Photo Library
Brecciated Agate Stone #1
Natural History Museum, London/science Photo Library
Geode Containing Chalcedony #1
Natural History Museum, London/science Photo Library
Geode Containing Chalcedony
Natural History Museum, London/science Photo Library
Tiger's-eye Variety Of Chalcedony
Science Stock Photography/science Photo Library
Sandstone In Chalcedony Matrix
Steve Lowry/science Photo Library
Frieda Thunder Egg Agate
Natural History Museum, London/science Photo Library
Agate Cabuchon Stone
Natural History Museum, London/science Photo Library
Succor Creek Thunder Egg Agate
Natural History Museum, London/science Photo Library
Lake Superior Agate
Natural History Museum, London/science Photo Library
Brecciated Agate Stone
Natural History Museum, London/science Photo Library
Dyed Agate Slice #1
Natural History Museum, London/science Photo Library
Tiger Eye Gemstone
Natural History Museum, London/science Photo Library
Agate. Polarised Light Micrograph #1
Antonio Romero
Iris Agate
Natural History Museum, London/science Photo Library
Carnelian Gemstone
Natural History Museum, London/science Photo Library
Paint Rock Agate
Natural History Museum, London/science Photo Library
Agate. Polarised Light Micrograph #2
Antonio Romero
Botswana Agate Stones #1
Natural History Museum, London/science Photo Library
Garnet Gemstone
Natural History Museum, London/science Photo Library
Zeolite Crystal
Natural History Museum, London/science Photo Library
Chalcopyrite
Natural History Museum, London/science Photo Library
Plume Agate
Natural History Museum, London/science Photo Library
Bubble Lace Agate #1
Natural History Museum, London/science Photo Library
Agate
Pascal Goetgheluck/science Photo Library
Plume Agate #1
Natural History Museum, London/science Photo Library
Pedrara Onyx #1
Natural History Museum, London/science Photo Library
Agate #3
Natural History Museum, London/science Photo Library
Cross Section Of Agate Stone
Natural History Museum, London/science Photo Library
Amethyst #1
Natural History Museum, London/science Photo Library
Agate Mineral Rock Cross Section #5
Natural History Museum, London/science Photo Library
Pedrara Onyx
Natural History Museum, London/science Photo Library
Agate. Polarised Light Micrograph
Antonio Romero
Sweet Home Agate
Natural History Museum, London/science Photo Library
Cabuchon Gemstones Of Jasper
Natural History Museum, London/science Photo Library
Agate Mineral Rock Cross Section #2
Natural History Museum, London/science Photo Library
Round Agate Geode #1
Natural History Museum, London/science Photo Library
Sweetwater Agates
Natural History Museum, London/science Photo Library
Moss Agate Marble Pattern #1
Natural History Museum, London/science Photo Library
Moss Agate
Steve Lowry/science Photo Library
Bloodstone Specimen
Science Stock Photography/science Photo Library
Hollow Agate With Crystal
Natural History Museum, London/science Photo Library
Agate Slice
Natural History Museum, London/science Photo Library
Amethyst
Natural History Museum, London/science Photo Library
Antelope Agate
Natural History Museum, London/science Photo Library
Agate In Amethyst
Natural History Museum, London/science Photo Library
Agua Nueva Agate #1
Natural History Museum, London/science Photo Library
Botswana Agate Stone
Natural History Museum, London/science Photo Library
Lysite Agate
Natural History Museum, London/science Photo Library
Dolomite Mineral
Natural History Museum, London/science Photo Library
Agate Silica Crystals In Stone
Natural History Museum, London/science Photo Library
Agate Stone Cross Section #4
Natural History Museum, London/science Photo Library
Flame Agate Stone Pattern #1
Natural History Museum, London/science Photo Library
Bloodstone
Science Stock Photography/science Photo Library
Agate #6
Natural History Museum, London/science Photo Library
Crater Agate
Natural History Museum, London/science Photo Library
Cut And Polished Agate
George Bernard/science Photo Library
Amethyst Stone
Natural History Museum, London/science Photo Library
Paul Bunyon Plume Agate
Natural History Museum, London/science Photo Library
Lake Superior Agate #1
Natural History Museum, London/science Photo Library
Botswana Agate Stone #1
Natural History Museum, London/science Photo Library