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?

1 Answer 1


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.

  • Thanks for the fast response! +1 for the "occasioanlly". But do you think it is clear to the reader from your formulation, that ice crystals are only rarlely appearing? Couldn't I use "and, occasionally, ice crystals"?
    – matheburg
    Sep 19, 2015 at 10:55
  • Maybe my edit is better @matheburg Sep 19, 2015 at 11:02

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