Is it valid in English to use a construction like:
Fog consists of tiny water droplets or, rarely, ice crystals.
If not, how can I elegantly solve this problem?
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I think it's ok how you said it, but you can make it a little easier to read by stating something like this instead:
Fog consists of tiny water droplets and occasionally ice crystals.
Fog consists of tiny water droplets with the rare formation of ice crystals.