Cross-section of Chambered Nautilus --- Image by © Klaus Hackenberg/Corbis
Cross section of Chambered Nautilus --- Image by © Josh Westrich/Corbis
Nautilus shell against grid background --- Image by © Tetra Images/Corbis
11 Aug 2005 --- Nautilus Shell --- Image by © Frans Lanting/Corbis
Original caption: The Nautilus is nature's most beautiful example of the mathematical principle of the "golden ratio" and the number Phi. --- Image by © Doug Landreth/Science Faction/Corbis
Negative Image of Chambered Nautilus Shell --- Image by © James L. Amos - The Stock Connec/Science Faction/Corbis
Nautilus shell, South Pacific Ocean --- Image by © Frans Lanting/Corbis
03 Oct 2008 --- Found on Cumberland Island, Georgia, a single spiralling Naticid Snail shell with blue and pink hues. --- Image by © Visuals Unlimited/Corbis
Variscite.
Crocoite crystals, Australia
Apatite lilac-colored crystals in Pegmatite, Cornwall, England
Rhodochrosite crystals, Colorado, USA
Scolecite crystals, India.
Cylindrite, Bolivia.
Rhodochrosite (MnCO3), an ore of Manganese, Argentina, South America.
Stibnite crystals, the main ore of Antimony, China.
Fluorite crystals, China.
Wulfenite crystals, Arizona, USA.
04 May 2009 --- X-ray Image, Shell --- Image by © Imagemore Co., Ltd./Corbis
10 Feb 2003 --- Andalusite, cross section of crystals exposed in a cut and polished slate, Morbihan, France --- Image by © Gary Cook, Inc/Visuals Unlimited/Corbis
Nautilus shell --- Image by © Josh Westrich/Corbis
Graphic Design; Snail Shell --- Image by © 68/Ocean/Corbis
A spiral shaped nautilus shell --- Image by © Tetra Images/Corbis
15 May 2007, California, USA --- Borax Crystals --- Image by © Visuals Unlimited/Corbis
Germany --- Ammonite Fossil in Slate --- Image by © Walter Geiersperger/Corbis
Original caption: A fossil ammonite on the Jurassic Coast World Heritage Site in the Lyme Regis area of Dorset, England, UK. --- Image by © Frank Siteman/Science Faction/Corbis
Original caption: Ammonite fossil. Ammonites are extinct marine invertebrates. They first appeared in the Late Silurian to Early Devonian period (around 400 million years ago) and became extinct at the end of the Cretaceous period (65 million years ago). --- Image by © Gavin Kingcome/Science Photo Library/Corbis
Amethyst crystals, a variety of Quartz, Brazil, South America.
Wulfenite, an ore of Molybdenum, Arizona, USA.
Orpiment crystals, Nevada, USA
Mimetite, variety Campylite, orange-colored crystals, Kellogg, Idaho, USA
Rutile in Quartz.
Lapis Lazuli, Pakistan.
Table Salt crystals, Sodium Chloride.
Stibnite crystals, the main ore of Antimony, Japan.
Beryl crystals, variety Aquamarine, on Mica, Pakistan.
Calcite crystals, Mexico.
Mica diorite thin section showing component crystals, polarized view. LM
Close-up of tarnished Silver.
01 Apr 2006 --- Malachite, Arizona, USA --- Image by © Scientifica/Corbis