felsite

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Felsite

Roccia eruttiva (vulcanica, plutonica) costituita principalmente da quarzo e feldspati (dai quali trae il nome). Può contenere fenocristalli e la compagine della roccia, o solamente la pasta di fondo, è caratterizzata da una struttura microcristallina o criptocristallina.

Felsitico

Termine usato per definire una struttura microcristallina o, più raramente, criptocristallina.