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Tuscanite: K(Ca,Na)6(Si,Al)10O22(SO4,CO3,(OH)2)·(H2O) Augite: (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6
Comments: Translucent tuscanite microcrystal in in vug in low-Fe augite (var. fassaite).
Location: Pitigliano Quarry, Grosseto, Tuscany, Italy.
Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species