On the compositional variability of dalyite, K2ZrSi6O15; a new occurrence from Terceira, Azores
Macaronesia, Océano Atlántico, Mineralogy, Azores, cations, potassium, sodium, volcanic rocks, Terceira, Atlantic Ocean Islands, igneous rocks, metals, silicates, pyroclastics, chemical composition, crystal chemistry, Terceira Island, alkali metals, alkali syenites, Caldeira-Castelinho Ignimbrite Formation, dalyite, electron probe data, formula, ignimbrite,...