||Aragonite is a form of Calcium Carbonate or limestone. At ordinary temperatures and pressures it changes to the more common calcite in as little as a few hours. Many shelled organisms use aragonite. When such an organism dies, the aragonite shell normally changes to calcite, but retains the characteristic needle shape of the aragonite crystals, which give the shell both lightness and great strength.
photo: USGS MII
To support this research with your donations, click here.
|This photo is part of a series called "Petrified Rose". Click here to view the whole series
This photo is free to use for educational purposes.
For permission to use this image, send an email to email@example.com