Sure looks like calcium. Good morning Lynn, are oyster shells that thick? Chicken grit should have calcium for the bones and shells if they lay eggs.
Now here comes the funny part, what is lime stone? http://en.wikipedia.org/wiki/L...
and what is cement? http://en.wikipedia.org/wiki/C...
What is your gravel composed off?
Regards,
Arif.
should have calcium for the bones and shells if they lay eggs.
