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Augite: (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6
Comments: Clear, dark gray augite prisms in matrix. Location: Isle of Ischia, near Naples, Compania, Italy. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Augite: (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6 Tuscanite: K(Ca,Na)6(Si,Al)10O22(SO4,CO3,(OH)2)·(H2O)
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
Augite: (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6 Calzirtite: CaZr3TiO9 Richterite: Na(CaNa)(Mg,Fe++)5[Si8O22](OH)2
Comments: Gray irregular grain of calzirtite (see arrow) in fibrous augite with dark red richterite. Location: Jacupiranga Mine, Cajati, Sao Paulo, Brazil. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species