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Heulandite-Na: (Na,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O)
Comments: Orange tabular crystals of heulandite-Na lining a vug. Location: Warm Spring Creek, Challis, Custer County, Idaho, USA. Scale: See Image. © Rruff Database
Heulandite-Sr: (Sr,Na,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O)
Comments: Colorless prismatic-pinacoidal crystal of heulandite-Sr. Location: Campegli mine, Sestri Levante, Genova province, Liguria, Italy. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Hewettite: CaV6O16·9(H2O) Fervanite: Fe+++4(VO4)4·5(H2O)
Comments: Spherical aggregate of acicular microcrystals of fervanite with blocky hewettite. Location: Gold Quarry Mine, Carlin Trend, Eureka County, Nevada, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Hewettite: CaV6O16·9(H2O)
Comments: Red sub-metallic fibrous mats of hewettite on matrix. Location: Cactus Rat Mine, Thompson's District, Grand Count, Utah, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Hexaferrum: (Fe,Os,Ru,Ir)
Comments: Polished section showing a white euhedral crystal of hexaferrum in gray chromite. Location: Pole Corral Pass, Rattlesnake Creek Terrane, Beegum, California, USA. Scale: Picture size 14 mm. © Thomas Witzke
Hexahydrite: MgSO4·6(H2O)
Comments: White fibrous mats and powdery encrustation of hexahydrite on matrix. Location: near Basque, Bonaparte River, British Columbia, Canada. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Hexahydroborite: Ca[B(OH)4]2·2(H2O)
Comments: White to translucent hexahydroborite. Location: Solongo B deposit, Vitim Plateau, Buriatia (Buryatia) Republic, Transbaikalia (Zabaykalye), Eastern-Siberian Region, Russia. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag
Hexamolybdenum: (Mo,Ru,Fe,Ir,Os) Allendeite: Sc4Zr3O12
Comments: BSE image of the refractory inclusion in the Allendeite meteorite containing allendeite (BSE bright phase) and hexamolybdenum (BSE bright phase). Location: Allende meteorite, Pueblito de Allende, Chihuahua, Mexico.. Scale: See Image. © Lunar and Planetary Science Instutute
Heyite: Pb5Fe++2(VO4)2O4
Comments: Mustard yellow colored microcrystalline aggregates of heyite on quartz. Location: Betty Joe Claim, near Ely, White Pine County, Nevada, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Heyrovskyite: Pb10AgBi5S18
Comments: Metallic, gray heyrovskyite in quartz. Location: Hûrky u Cistá, Velká Chmelistná (Großmeleschen), Rakovnik, Stredoceský Kraj, Bohemia, Czech Republic. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag