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Yakovenchukite-(Y): K3NaCaY2(Si12O30)·4H2O
Comments: B&W image of a druse of yakovenchukite-(Y) crystals in a void within sodalite-aegirine-microcline veinlet in ijoliteurtite. (AmMin v92:1527). Location: Mt. Kukisvumchorr (Khibiny Massif), Russia. Scale: Picture size 3.0 x 2.4 mm. © American Mineralogist