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Yttrocrasite-(Y): (Y,Th,Ca,U)(Ti,Fe+++)2(O,OH)6
Comments: Polished specimen image showing yellow-orange rhombic sections of prismatic yttrocrasite-(Y) crystals along the fissure in almost black chloritoid aggregate. Location: Chudnoe Pd-Au deposit, Grubependity lake, Komi Republic, Northern Region, Russia. Scale: Picture Size 4x5 mm. © Pavel M. Kartashov
Yttropyrochlore-(Y): (Y,Na,Ca,U)1-2(Nb,Ta,Ti)2(O,OH)7
Comments: Vitreous brown metamict yttropyrochlore-(Y). Location: Alakurtti pegmatite, North Karelia, Murmanskaja Oblast', Northern Region, Russia. Scale: See Image. © Rruff Database
Yttrotantalite-(Y): (Y,U,Fe++)(Ta,Nb)O4
Comments: Dark greenish-black crystal of Yttrotantalite-(Y). Location: Ytterby, Resarö, Vaxholm, Stockholm, Sweden. Scale: Picture size 8 mm. © Thomas Witzke / Abraxas-Verlag
Yttrotungstite-(Y): YW2O6(OH)3
Comments: Orange crystals of Yttrotungstite-(Y). Location: Kramat Pulai mine, Kinta, Perak, Malaysia. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Yuanfuliite: (Mg,Fe++)(Fe+++,Al,Mg,Ti,Fe++)(BO3)O
Comments: Black inclusions of yuanfuliite in matrix. Location: Tayeznoye Deposit, 100 km S. of Aldan, Yakutia, Russia. Scale: Specimen Size 1.2x2.2 cm. © Diederik Visser
Yugawaralite: CaAl2Si6O16·4(H2O)
Comments: Pearly translucent colorless yugawaralite microcrystals. Location: Klif Hvalfjordur, Iceland. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Comments: Yugawaralite, in well developed vitreous crystals up to 1 cm. in a large vug on matix. Location: Khandivaly Quarry, Maharastra, India. Scale: Picture size 2 cm. © Sandro Maggia/Minernet.it
Yukonite: Ca7Fe+++11(AsO4)9O10·24.3(H2O)
Comments: dark red brown resinous yukonite on limonite. Location: Venus Gold-Silver mine, Yukon Territory, Canada. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Yuksporite: (Sr,Ba)2K4(Ca,Na)14([ ],Mn,Fe){(Ti,Nb)4(O,OH)4[Si6O17]2[Si2O7]3}(H2O,OH)n, n~3
Comments: Opaque fibrous yuksporite aggregate. Location: Mount Yukspor, Khibiny Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Yushkinite: V1-xS·n(Mg,Al)(OH)2
Comments: Veinlet of purple metallic yushkinite in white calcite. Location: Yushkinite gorge, Yugorskii Peninsula, Polar Urals, Russia. Scale: Picture Size 3 mm. © Jeff Weissman / Photographic Guide to Mineral Species
Yvonite: Cu(AsO3OH)·2(H2O)
Comments: Bluish green or turquoise-colored microcrystals of yvonite on metallic matrix of arsenopyrite & native bismuth. Location: Salsigne mine, Carcassone, Aude, France. Scale: 2 cm. © John Attard