Gene, you may want to signify coral sand.  Quartz sand (freshwater beaches)
weighs more than ocean sand (calcium carbonate).  It also depends on how
fine the sand is.

Oolitic sand (formed by precipitation and very fine) weighs more than the
coarser sand found near mollusk beds and reef tracts.
The very fine sand produced by parrotfish would be closer to the oolitic.

     Linda Wilson                    Visitor Studies and Evaluation
     Shedd Aquarium                  1200 S. Lake Shore Drive
     Chicago, IL 60605
     PH (312) 692 3261  FAX (312) 939 8677     [log in to unmask]

This feels a little strange, doesn't it, working a few hundre yards apart
and communicating over a list.  Isn't electronic science wonderful!

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