Paul S. I "think" that much confusion is caused in the main
due to the many different names that different countries call the very same glass-types... These things do not help, but cannot be avoided and nobody is to blame.
Certain terminology can also detract from what is the same: Warm Glow... Firery Glow... etc. A Glow is a glow after all and one will perhaps write "Firery" or "Warm"
when describing a certain glass. "MILKY-WHITE" or "CREAMY WHITE" for opalescent!
Same as Satin Finish... Matt-Frosted... but then again Satin GLASS is yet another term, which say in USA will be nown as Mother of Pearl...
But Mother of Pearl, was also termed by Kralik,
and both galss types are completely different...
The confusion continues to this very day and can become a mine field.
Many French folks will call any glass type Pate de Verre,
when to us here in England, Pate de Verre cannot be applied to every piece of glass...
We do not recognise Depression Glass or Vaseline Glass as terms which we have used...
It is Art Deco era glass or Uranium and not Vaseline.
Who is right or who is wrong is simple....
Neither of us are.Center piece.. or Centrepiece? Color or Colour?
I would suggest that the only thing which truly differentiates, is the actual make-up of any glass-type; the ways in which it was produced, and when etc. which can determine what it is, rather than what "we" all choose to call it, in our own way.
And yes... OPALINE, to "ME" refers to a French glass, and was produced there only...
If or when the term OPALINE became more widespread, then fine, so be it perhaps,
but that is my individual understanding... as learned, and OPALINE glass is NOT Opalescent glass. It is an entirely different glass all together.
"Cranberry glass" ... or is it "Ruby" or "Crystal Cased Ruby Glass???"
Each glass type (it could be argued) is exactly the same...
Only the terms that are used are different,
used by whoever it is that is describing such glass...
I still like that Opalescent-Opal-Opaline Press-Moulded-Flashed-Glass Pike!