Thanks Bill. My guess is that those researchers would answer by
saying that the older host rock is mixed into the melt of the new
host rock so completely that they cannot be differentiated (otherwise
the ore body would be conglomerate-like or breccia-like).
How much detail do jewellers think their customers would like to
know about the origins of stone which they are buying in general?
The Xinjiang book on gems and jades makes me wonder if the Chinese
jade market has more interest in this matter than we find in the
West. After all, they have thousands of years behind them as jade
sellers and buyers. Xinjiang provides three major descriptions with
maps, petrographic analyses and assay profiles to tell the customer
where these stones originate. Perhaps the food and wine market is
analogous. Most people do not want to know very much about what they
eat and drink. The gourmet wants to know quite a lot more. The
Kelowna million dollar emerald would not have earned one line of
newsprint if gem buyers here had higher disclosure expectations.
Perhaps the promoters would have been disappointed.