Picture would be good if you have one.
If you want to make sure you have clean stuff just recrystallize it. It does not take too long. Have you done evaporation test before extraction ?
If you want to just make sure no naphtha is trapped inside your crystals than just redissolve it in IPA or Acetone and let evaporate. This way you will get rid off any naphtha left in spice.Some people say that spice gets yellow after doing that.
I have never done this my self though. I always recrystallize to make it purer.
Good luck
We are each of us angels with only one wing, and we can only fly by embracing one another.
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We are all living in our own feces.