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Holmquistite: [ ](Li2Mg3Al2)Si8O22(OH)2 Magnesioholmquistite: Li2(Mg,Fe++)3Al2Si8O22(OH)2
Comments: Dark blue thin bladed crystals of holmquistite (magnesioholmquistite) in amphibolite. Location: Uto, Sodermanland, Sweden. Scale: See Image. © Rruff Database
Holmquistite: [ ](Li2Mg3Al2)Si8O22(OH)2
Comments: Greenish-black prismatic crystals of holmquistite in matrix. Location: Uto, Sodermanland, Sweden. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Holtedahlite: Mg12(PO3OH,CO3)(PO4)5(OH,O)6
Comments: Colorless glassy crystalline granular holtedahlite (appears gray in image) with yellow serpentinite rock and white apatite. Location: Tingelstadtjern, Modum, Buskerud, Norway. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Holtite: Al6(Al,Ta)(BO3)[(SiO4,SbO4,AsO4)]3(O,OH)3
Comments: Pale violet crystalline granular holtite in pegmatite. Location: Vasin-Myl'k Mountain, Voron'i Tundry, Kola Peninsula, Murmansk District, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Homilite: Ca2(Fe++,Mg)B2Si2O10
Comments: Brown crystalline masses of homilite in white feldspar. Location: Aroy, Langesundfjord, Telemark, Norway. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Honessite: Ni6Fe+++2(SO4)(OH)16·4(H2O)
Comments: Medium green honessite pseudomorphous after acicular millerite crystals, in white calcite. Location: Troy, Lincoln County, Missouri, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Hongshiite: PtCu Palladodymite: (Pd,Rh)2As Ruthenium: (Ru,Ir,Os)
Comments: Palladodymite (light gray, in two small grains), hongshiite (pale creamy grayish, tarnished brownish) in massive ruthenium. Polished section (from microprobe analysis) in reflected light. Location: Miass River, Zlatoust, Ilmen Mts, Chelyabinsk Oblast', Urals Region, Russia. Scale: Picture size 0.09 mm. © Thomas Witzke / Abraxas-Verlag
Hopeite: Zn3(PO4)2·4(H2O)
Comments: Brownish pink, transparent crystalline aggregate of hopeite crystals. Location: Broken Hill mine, Kabwe, Central, Zambia. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Hornesite: Mg3(AsO4)2·8(H2O)
Comments: Aggregate of white pearly platy crystals of hornesite on matrix. Location: Bauhaus, Richelsdorf, Hessen, Germany. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Horvathite-(Y): NaY(CO3)F2
Comments: Blocky crystals of horvathite-(Y) in matrix. Location: Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry), Mt Saint-Hilaire, Rouville Co., Québec, Canada. Scale: Picture size 3.5 mm. © Thomas Witzke / Abraxas-Verlag
Howieite: Na(Fe++,Mn++)10(Fe,Al)2Si12O31(OH)13
Comments: Black vitreous radiating crystalline howieite. Location: Longvale Quarry, Mendocino County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species