"Green beryl" is either too light colored to be called "emerald" or does not contain Cr - as the official definition goes. As far as I know, these green beryls chemically different from typical emerald are also lighty colored - but there must have been some exceptions to the rule. Some time back, Mogoc wrote a very good intro to the topic - it is somewhere around here.
As an aside, allot of aquamarine is greenish before heating and some such stones do not acquire the desired blue color at all after the usual heat treatment. These may be presented as "green beryl" along with some quite attractive, large, clean and light green gems such as a couple on THIS page.
"Green Morganite" sounds like just another commercial name...
There is a mint green beryl that is very pretty, not as included as it's cousin emerald. Be aware of new treatments that take worthless colorless beryl and diffuse color into it which is permanant but adds only pennies to cost but will be shown all over the internet and tv channels soon. Of course at a very large profit.
Scott
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