well heck, we'll get the discussion moving..
there is a big difference between a flintie and flint moonie.
1. flint moonie was a company name. we sold a # 0 'flint moonie' box set to Roger about 15 years back. Only box he has of one in that size.
2. flinties were the red colored ones. Commonly seen with the eyes(although we have a few with '9's) the flint moonies, are not colored.
3. the yellow, green and blue ones were called opals, by akro, again a company name, sold as such.
4. there's also a 'fire opal' named by Roger. thats kind of an orange-y color. and it truly looks like it's on fire!
(there's a picture of a box set of #3 moonies, that will be in our newsletter this month).
5. looking at all our flinties and opals,and moonies, only a very few are hand gathered. however there may be more out there, as they were made around the time of the slags and brick types.
as for the difference between the cac and akros? in hand you can tell the difference. glass is a little diffrent as is the patterning. although hard to see!
Roger shows the box sets in his books.:-)
the main diffrence between a flint moonie and just a moonie? as you said, when a light is cast through the moonie it shows an orange dot. when you do the same thing to a flint moonie it shows a red dot!