Floris van Breugel / Various fluorescent minerals : 1Willemite, New Jersey, 2: Willemite and Calcite, New Jersey, 3: Fluorite, Ohio, 4: Willemite and Calcite, New Jersey. 5: Fluorite, California. 6: Scheelite, California....

Paul D Stewart / Ammonite (Pleuroceras sp) fossilized in pyrite, from the Jurrassic period found in Buttenheim, Germany .

Paul D Stewart / Ammonite (Cosmoceras proniae) from Jurrasic period, 165 million years ago, from Russia. Shown ithin the shell of modern Abalone (Haliotis sp.) This illustrates the preservation in the ammonite fossil...

Paul D Stewart / Ammonite (Placenticeras) shell from upper Cretaceous period 75 million year ago, showing iridescent ammolite gem skin, cracked and flaked in the typical 'dragon skin' pattern.

Floris van Breugel / Various minerals that fluoresce under UV light including, Willemite, Aragonite, Fluorite and Zircon. See image 1434814 for specific identifications and country of origins.

Floris van Breugel / Various fluorescent minerals, under UV light including, Willemite, Aragonite, Fluorite and Zircon. See image 1434814 for specific identifications and country of origins.

Jean E. Roche / Calcite and Aragonite deposits in the Clamouse caves, Herault, Languedoc, France, August 2008

John Cancalosi / Aragonite crystals (Ca CO3 / Calcium carbonate) from China

Graham Eaton / Aragonite, calcium carbonate, CaCO3, from the Yorkshire Dales, UK