El terme «feldespat alcalí» es refereix a un feldespat ric en potassi i/o sodi dominant del qual no es coneix la simetria ni la distribució d'Al i Si; pot referir-se a:[1]
- Anortoclasa
- Microclina
- Ortosa
- Pertita
- Sanidina
- Albita sòdica
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