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Fluoro-ferroleakeite: NaNa2(Fe++2Fe+++2Li)Si8O22F2
Comments: Heavy mineral concentrate of dark blue to black fluoro-ferroleakeite grains, co-type sample. Location: Questa, Taos County, New Mexico, USA. Scale: See Image. © Rruff Database
Fluoro-magnesio-arfvedsonite: NaNa2(Mg,Fe++)4Fe+++[Si8O22](F,OH)2
Comments: Heavy mineral concentrate of small dark green fragments of fluoro-magnesio-arfvedsonite. Location: Unknown. Scale: See Image. © Rruff Database
Gadolinite-(Y): Y2Fe++Be2Si2O10 Calciogadolinite: CaREE(Fe+++)Be2Si2O10
Comments: Black vitreous, metamict massive gadolinite-(Y) also known as calcian gadolinite. Location: Ytterøya Mine, Røvika, Ytterøya (island), Levanger, Nord-Trondelag, Norway. Scale: See Image. © Rruff Database
Gedrite: [ ]Mg5Al2Si6Al2O22(OH)2 Magnesiogedrite: (Mg,Fe++)5Al2Si6Al2O22(OH)2
Comments: Dark gray cleavage fragment of magnesiogedrite (gedrite). Location: Bamble, Telemark, Norway. Scale: See Image. © Rruff Database
Georgbokiite: Cu5O2(SeO3)2Cl2
Comments: Deep reddish brown polished fragment of georgbokiite embedded in epoxy, co-type material. Location: Tolbachik Volcano, Kamchatka Peninsula, Russia. Scale: Picture Size 300 µm. © Rruff Database
Hafnon: HfSiO4
Comments: Colorless unconsolidated hafnon grains, sample is from Speer and Cooper (1982). Location: Synthetic from Alex Speer. Scale: See Image. © Rruff Database
Haxonite: (Fe,Ni)23C6
Comments: Dark gray metallic haxonite fragment embedded in epoxy. Location: Egvekinot meteorite, Chukot Province, Russia. Scale: See Image. © Rruff Database
Hellandite-(Ce): (Ca3REE)4Ce2Al[ ]2[Si4 B4O22](OH)2
Comments: Pale yellow platy hellandite-(Ce) crystals in a vug. Location: Campo Pefella, near Capranica, Viterbo, Latium, Italy. Scale: See Image. © Rruff Database
Heulandite-K: (K,Na,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O)
Comments: Coating of orange heulandite-K crystals on matix. Location: Albero Bassi, Vicenza, Veneto, Italy. Scale: See Image. © Rruff Database
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
Holdawayite: Mn++6(CO3)2(OH)7(Cl,OH)
Comments: Compact platy crystalline holdawayite. Colorless when thin, but brown when thick. Location: Kombat, Namibia. Scale: See Image. © Rruff Database
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
Hydroxylbastnasite-(Ce): Ce(CO3)(OH)
Comments: Orangy brown hexagonal tablet of hydroxylbastnasite-(Ce). Location: Trimouns, Luzenac, France. Scale: See Image. © Rruff Database
Hydroxylclinohumite: Mg9(SiO4)4(OH,F)2
Comments: Deep red tabular hydroxylclinohumite crystal. Location: Koksha Valley, Badakshan Province, Afghanistan. Scale: See Image. © Rruff Database
Iltisite: HgSAg(Cl,Br)
Comments: Reddish brown acicular iltisite crystals associated with baryte, cornwallite, strashmirite and quartz. Location: Cap Garonne Mine, Pradet, Var, Provence-Alpes-Cote d'Azur, France. Scale: See Image. © Rruff Database
Jahnsite-(CaMnFe): CaMn++Fe++2Fe+++2(PO4)4(OH)2·8(H2O)
Comments: Orange-brown microcrystalline jahnsite-(CaMnFe) associated with quartz. Location: Voron'i Tundry, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: See Image. © Rruff Database
Jamesite: Pb2Zn2Fe+++5(AsO4)5O4 Duftite-beta: PbCu(AsO4)(OH)
Comments: Reddish-brown bladed jamesite crystals overgrown with white dolomite and associated with dark green duftite. Location: Tsumeb mine, Tsumeb, Otavi District, Oshikoto, Namibia. Scale: See Image. © Rruff Database
Jerrygibbsite: (Mn,Zn)9(SiO4)4(OH)2
Comments: Pale pink interlocking anhedral jerrygibbsite grains associated with black zincite and franklinite. Co-type specimen. Location: Parker Shaft, Franklin Mine, Franklin, Franklin Mining District, Sussex Co., New Jersey, USA. Scale: See Image. © Rruff Database
Kamaishilite: Ca2Al2SiO6(OH)2
Comments: Colorless crystalline massive kamaishilite. Location: Kamaishi mine, Iwate Prefecture, Tohoku Region, Honshu Island, Japan. Scale: See Image. © Rruff Database
Karchevskyite: [Mg18Al9(OH)54][Sr2(CO3,PO4)9(H2O,H3O)11]
Comments: Colorless hexagonal plates of karchevskyite, co-type material, associated with phlogopite, dolomite, pyrite, and magnetite. Location: Zheleznyi mine, Kovdor Massif, Kola Peninsula, Russia. Scale: See Image. © Rruff Database