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Panunzite: (K,Na)AlSiO4
Comments: Translucent colorless panunzite crystals lining a small cavity in greenish volcanic matrix. Location: Valle de Diablo, Somma-Vesuvius Complex, Campania, Italy (Type Locality for Panunzite). Scale: Crystal Size 1-1.5 mm. © John Betts - Fine Minerals