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One of my favorite sellers from Australia is Black Opal Direct; Justin Thomas, who also has great how to cut opal videos on his Youtube channel, uploaded a explanatory video for the word Crystal when referring to opals. This doesn't go into some other words used for similar opals such as jelly or Girasol or water opals which have also been used to describe opals you can see light thru or similar categories or common transparent rough with no play of color. We all need to settle on a single set of descriptions for opals features for listings:

Justin's videos are always good, and his explanation agrees with what my own head has always told me a crystal opal is. You and OS are right about the need to synchronize the terminology of color patterns as well as definitions such as this, so I'm sure he's going to appreciate you posting it, too. Thanks!