Here is a worksheet on distinguishing the adjectives envious and jealous. The distinction is thin, but as usual, Paul Brians does a nice job in making the distinction clear: you are envious of what others have, but you become jealous when you are trying to hold on to what you have.
If you find typos in this document, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.