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Yakhontovite: (Ca,K)0.5(Cu,Fe+++,Mg)2Si4O10(OH)2·3(H2O)
Comments: Green coating of yakhontovite in matrix. Location: Granite Gap, Hidalgo Co., New Mexico, USA. Scale: Specimen Size 2x2.5 cm. © Diederik Visser
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
Yanomamite: In(AsO4)·2(H2O)
Comments: Gray-blue waxy yanomamite coatings on quartz. Location: Mangabeira Tin Deposit, Goias, Brazil. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Yarrowite: Cu9S8 Spionkopite: Cu1.4S
Comments: Blue-black metallic granular spionkopite, intermixed with yarrowite altering, with quartz. Location: Yarrow Creek, Alberta, Canada. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Comments: Blue-gray metallic yarrowite grains in granular quartz rock with spionkopite. Location: Yarrow Creek, Alberta, Canada. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Yavapaiite: KFe+++(SO4)2
Comments: Translucent pale pinkish-tan colored crystal fragments. Location: United Verde Mine, Jerome, Verde District, Black Hills (Black Hill Range), Yavapai Co., Arizona, USA. Scale: Fragment Size 1 mm. © Jeff Weissman / Photographic Guide to Mineral Species
Yeatmanite: Mn++9Zn6Sb+++++2Si4O28
Comments: BSE image of willemite (Wil), unaltered yeatmanite (Yeat) and alteration phase (Alt). Location: Garpenberg Norra mine in Dalarna County, Sweden. (CanMin, v41:201). Scale: See Image. © Canadian Mineralogist
Yecoraite: Bi5Fe+++3(Te++++O3)(Te++++++O4)2O9·9(H2O)
Comments: Tan to reddish brown resinous yecoraite coatings on quartz. Location: Marie Elena Mine, Yecora, Sonora, Mexico. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Yedlinite: Pb6CrCl6(O,OH)8 Diaboleite: Pb2CuCl2(OH)4
Comments: Minute cranberry-colored rounded yedlinite crystal with blue diaboleite on yellow-brown wulfenite. Location: Mammoth Mine, Tiger, Pinal County, Arizona, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Yeelimite: Ca4Al6O12(SO4) Ellestadite-(OH): Ca5(SiO4,SO4)3(OH,Cl,F)
Comments: Ye'elimite and hydroxylellestadite intimately intergrown as a brownish aggregate in massive anhydrite. Location: Ronneburg U deposit, Gera district, Thuringia, Germany. Scale: Picture size 6 mm. © Thomas Witzke / Abraxas-Verlag
Yimengite: K(Cr,Ti,Fe,Mg)12O19 Diamond: C
Comments: Birefringence image of diamond displaying the location of yimengite inclusions (1, 2 , 3, 4, and 5) along the different octahedral growth zones. (Lithos, v77:181). Location: Sese kimberlite (50 km) south of Masvingo, Zimbabwe. Scale: See Image. © Lithos
Yimengite: K(Cr,Ti,Fe,Mg)12O19
Comments: SEM image of the yimengite-5 inclusion intergrown with chromite lamellae. (Lithos, v77:181). Location: Sese kimberlite (50 km) south of Masvingo, Zimbabwe. Scale: See Image. © Lithos
Yingjiangite: (K2,Ca)(UO2)7(PO4)4(OH)6·6(H2O)
Comments: Thin coating of yellow yingjiangite on matrix. Location: Kladaske Mine, Erzgeborge, Czech Republi. Scale: Picture size 1.5 cm. © John Veevaert
Yoderite: Mg2(Al,Fe+++)6Si4O18(OH)2
Comments: Dark bluish-black prismatic yoderite in quartz. Location: Mautia Hill, Dodoma, Tanzania. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Yofortierite: (Mn,Mg)5Si8O20(OH)2·8-9(H2O)
Comments: Radial spray of yofortierite in matrix. Location: Mt. St. Hilaire, Quebec, Canada. Scale: Picture size 1.5 cm. © John Veevaert
Yoshimuraite: (Ba,Sr)2(Mn,Fe)2(Ti,Fe)(Si2O7)2(PO4,SO4)(OH)
Comments: Translucent, brown yoshimuraite microcrystal. Location: Toguchi Mine, Shidara, Kitashidara-Gun, Aichi, Japan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Yoshimuraite: (Ba,Sr)2(Mn,Fe)2(Ti,Fe)(Si2O7)2(PO4,SO4)(OH) Katophorite: Na(CaNa)Fe++4(Al,Fe+++)Si7AlO22(OH)2
Comments: Dark green katophorite associated with yoshimuraite. Inset fragment shows the transparency of the katophorite. Location: Toguchi mine, Shidara, Kitashidara-Gun, Aichi, Japan. Scale: See Image. © Rruff Database
Yoshiokaite: (Ca8-(x/2)[ ](x/2)Al16-xSixO32)
Comments: B&W image of the largest yoshiokaite crystal yet found (grain #23); note fracturing probably caused by shock deformation and the groundmass of regolith glass. (AmMin v75:676). Location: At a distance of about 224 m from their Apollo 14 lunar lander, in the bottom of a 30-cm-deep trench, Mitchell and Shepard collected the two-gram rock that is regolith breccia 14076. Scale: Scale Bar 50 µm. © American Mineralogist
Yttrobetafite-(Y): (Y,U,Ce)2(Ti,Nb,Ta)2O6(OH)
Comments: Fragment of the large grain of compact mustard-yellow yttrobetafite-(Y) from the type locality. Associated minerals are black biotite and redish-brown veinlets of gummite. Location: Alakurtti pegmatite, Northern Karelia, Murmanskaja Oblast', Northern Region, Russia. Scale: Specimen size is 4.5x2.8x1.4 cm. © Pavel M. Kartashov
Yttrocerite: CaF2 + (Y,Ce)F3
Comments: Blue/purpley Yttrocerite in matrix. Location: Rockport Granite Company quarry, Rockport, Essex Co., Massachusetts, USA. Scale: Specimen Size 6.9 x 3.7 x 1.8 cm. © Rob Lavinsky