Chalcedony is the generic name for "cryptocrystalline quartz", meaning the individual crystals are too small to see. The term is frequently used when the specific variety is uncertain (for example, a sample that would be called an agate if it showed banding), or in technical references.
The primary varieties of chalcedony are as follows:
|
Rockhound, |
is Steve's pro-humanity, pro-space, pro-future blog,
and a forum to discuss his talks at the International Space Development Conference (sponsored by the
National Space Society).
|
You can make a difference!
Help President Obama, NASA, and
the people of Earth. See theApophis Challenge for solutions to: - Global Warming - Global Energy - Man in Space - Preventing the next Extinction Level Event |