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- Varieties that are not valid species:
- Palagonite (basaltic volcanic glass)
- Perlite (volcanic glass)
- Phosphorite (name given to impure, massive apatite.)
- Plessite (mixture of kamacite and taenite)
- Pitchblende (a massive impure form of uraninite)
- Pumicite (synonym of pumice)
Read more about this topic: List Of Minerals