Tom;-
  CaCO3 does precipitate out of ordinary water sourses---such as our faucett water in Cincinnati. In movement (my aqua-filter) it regularly builds up around the edges of the filter and on the rim of the aquarium. Possibly (but not definately) the same stuff.
    Art
>
> From: "Thomas E. Eichhorst" <[log in to unmask]>
> Date: 2004/07/25 Sun AM 10:27:45 EDT
> To: [log in to unmask]
> Subject: Re: Encrusted Shells
>
> Thanks all for the help with the encrusted nerite.  I have scans of the
> Vittina variegata from the stream on Vanuatu John Wolff talked about (thanks
> John), including the encrusted specimen.  It appears to be the same material
> as the Clithon I have from the Philippines.  A coralline algae makes sense,
> except these are freshwater shells, and thanks Jose, I will send you a
> specimen to examine.  Thanks Andrew, John, and Jose - nice to have some
> "outside" expertise!
>
> Tom Eichhorst in New Mexico, USA
>
>

PLEASE NOTE: My new, long-term, and correct email address is: [log in to unmask] Please update your records!

----------------------------------------------------------------------
[log in to unmask] - a forum for informal discussions on molluscs
To leave this list, click on the following web link:
http://listserv.uga.edu/cgi-bin/wa?SUBED1=conch-l&A=1
Type your email address and name in the appropriate box and
click leave the list.
----------------------------------------------------------------------