[Clayart] Unknown glaze materials

[Jeff Abney]

I have been given some glaze materials by another potter and I'm not
familiar with a couple of the names. One container is labeled "nickel
silica." Is it likely that this is just silica or is it something
different?  Another is a full bag from the J.R. Camadil company that says
it is 54% Calcium Carbonate and 43% Magnesium Carbonate. Is this possibly
Dolomite, or is it something else? Thanks for any help.
Jeff in Georgia
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