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Hochelagaite: (Ca,Na,Sr)Nb4O11·8(H2O)
Comments: White aggregate of small fibrous crystals of hochelagaite in matrix. Location: Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry), Mt Saint-Hilaire, Rouville Co., Québec, Canada. Scale: Picture size 4.5 mm. © Thomas Witzke / Abraxas-Verlag
Hoelite: (C6H4)2(CO)2
Comments: Yellow acicular crystals of hoelite with blocky yellow crystals of sulfur. Location: Carola Mine, Freital, near Dresden, Saxony, Germany. Scale: Picture size 10 mm. © Thomas Witzke / Abraxas-Verlag
Hollandite: Ba(Mn++++,Mn++)8O16
Comments: Gray, feathery aggregates of hollandite. Location: Sieben Brüder Mine, Langenberg, Schwarzenberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Hollingworthite: (Rh,Pt,Pd)AsS Laurite: RuS2
Comments: Gray grain of hollingworthite (in the center of the picture) with very slightly darker gray laurite (at the right margin). Polished section (from microprobe analysis). Location: Konder Mine, Konder alkaline-ultrabasic massif, Aldan shield, Saha (Sakha) Republic (Yakutia), Eastern-Siberian Region, Russia. Scale: Picture size 0.1 mm. © Thomas Witzke / Abraxas-Verlag
Comments: Gray laurite with two smaller grains of hollingworthite (left and right from the laurite, very slightly lighter gray). Polished section (from microprobe analysis) in reflected light. Location: Konder Mine, Konder alkaline-ultrabasic massif, Aldan shield, Saha (Sakha) Republic (Yakutia), Eastern-Siberian Region, Russia. Scale: Picture size 0.15 mm. © Thomas Witzke / Abraxas-Verlag
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
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
Humboldtine: Fe++(C2O4)·2(H2O)
Comments: Yellow crystals of humboldtine. Location: Lomnice, Sokolov, Západoceský Kraj, Bohemia, Czech Republic. Scale: Picture size 1.5 mm. © Thomas Witzke / Abraxas-Verlag
Hummerite: KMgV+++++5O14·8(H2O)
Comments: Orange-yellow hummerite on fossil wood. Location: Ronneburg U deposit, Gera district, Thuringia, Germany. Scale: Specimen size 65 mm. © Thomas Witzke / Abraxas-Verlag
Hunchunite: (Au,Ag)2Pb
Comments: Bluish-gray hunchunite in a polished section in reflected light. Location: Nizhne-Tagil'skoye (Mednorudyanskoye) Cu Deposit, Nizhnii Tagil, Sverdlovskaya Oblast', Urals Region, Russia. Scale: Picture size 0.2 mm. © Thomas Witzke / Abraxas-Verlag
Hydromagnesite: Mg5(CO3)4(OH)2·4(H2O)
Comments: White, blocky crystals of hydromagnesite. Location: Lobming, Styria, Austria. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Hydroniumjarosite: (H3O)Fe+++3(SO4)2(OH)6
Comments: Yellow, earthy hydronium-jarosite. Location: Reiche Zeche Mine, Himmelfahrt Mine, Freiberg, Freiberg District, Erzgebirge, Saxony, Germany. Scale: Specimen size 3.3 cm. © Thomas Witzke / Abraxas-Verlag
Hydrowoodwardite: Cu1-xAlx(OH)2(SO4)x/2·n(H2O) with 0 < x < 0.67 and n > 3x/2
Comments: Massive blue to greenish-blue hydrowoodwardite. Location: St Christoph Mine, Bärenhecke, Glashütte, Erzgebirge, Saxony, Germany. Scale: Specimen size 3.4 cm. © Thomas Witzke / Abraxas-Verlag
Hydroxycancrinite: Na4(AlSiO4)3(OH)·(H2O)
Comments: Pale grayish-blue, massive hydroxycancrinite. Location: Alluaiv Mt, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Picture size 6 mm. © Thomas Witzke / Abraxas-Verlag
Iimoriite-(Y): Y2(SiO4)(CO3)
Comments: Nearly colorless prismatic crystal of immolate-(Y) on dolomite. Location: Trimouns Talc Mine, Luzenac, Ariège, Midi-Pyrénées, France. Scale: Picture size 1.2 mm. © Thomas Witzke / Abraxas-Verlag
Ilesite: (Mn,Zn,Fe++)SO4·4(H2O)
Comments: Botryoidal to earthy, cream-colored ilesite. Location: Chvaletice, Kutná Hora, Stredoceský Kraj, Bohemia, Czech Republic. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag
Ilinskite: NaCu5O2(SeO3)2Cl
Comments: Dark green crystals of ilinskite on matrix. Location: Great Fissure (Main Fracture) eruption, Tolbachik volcano, Kamchatka Oblast', Far-Eastern Region, Russia. Scale: Picture size 1 mm. © Thomas Witzke / Abraxas-Verlag
Ilsemannite: Mo3O8·n(H2O) (?)
Comments: Dark blue ilsemannite. Location: Glückauf Shaft, Himmelsfürst Mine, Brand-Erbisdorf, Freiberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Imhofite: Tl6CuAs16S40
Comments: Dark red crystals and aggregates of imhofite in matrix. Location: Lengenbach quarry, Binntal, Wallis (Valais), Switzerland. Scale: Picture size 1.2 mm. © Thomas Witzke / Abraxas-Verlag
Indium: In
Comments: A grain of native indium. Location: Transbaikalia (Zabaykalye), Eastern-Siberian Region, Russia. Scale: Picture size 1.2 mm. © Thomas Witzke / Abraxas-Verlag