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Franckeite: (Pb,Sn)6Fe++Sn2Sb2S14
Comments: Massive franckeite with pockets of small .5 mm crystals. Location: Animas Mine, Atocha-Quechisla district, Sud Chichas Province, Potosí Department, Bolivia. Scale: 25x20x15 mm. © John Betts - Fine Minerals
Freibergite: (Ag,Cu,Fe)12(Sb,As)4S13
Comments: Dark metallic freibergite in white quartz. Location: Freiberg, Freiberg District, Erzgebirge, Saxony, Germany. Scale: 35x20x10 mm. © John Betts - Fine Minerals
Gadolinite-(Ce): (Ce,La,Nd,Y)2Fe++Be2Si2O10
Comments: Sharp, well crystallized single crystal of brown gadolinite. Location: Buer, Bjørkedalen, Porsgrunn, Telemark, Norway. Scale: 18x14x8 mm. © John Betts - Fine Minerals
Geocronite: Pb14(Sb,As)6S23
Comments: Many black geocronite crystals intergrown in milky quartz(?) matrix. Location: Sala Silver Mine, Sala, Västmanland, Sweden. Scale: 17x17x12 mm. © John Betts - Fine Minerals
Goosecreekite: CaAl2Si6O16·5(H2O)
Comments: Large cluster of many rosettes of white goosecreekite. Location: Jalgaon, Maharashtra, India. Scale: 15x14x7 cm. © John Betts - Fine Minerals
Gotzenite: (Ca,Na)3(Ti,Al)Si2O7(F,OH)2
Comments: Yellow-brown, thin crystals of götzenite in white feldspar matrix. Location: Barkevik, Langesundsfjorden, Vestfold, Norway. Scale: 3.5x3x3 cm. © John Betts - Fine Minerals
Hannebachite: 2CaSO3·(H2O)
Comments: Small .5 mm crystals of colorless hannebachite on matrix. Location: Hannebach, Niederzissen, Eifel Mts, Rhineland-Palatinate, Germany. Scale: 35x35x24 mm. © John Betts - Fine Minerals
Heulandite-Ca: (Ca,Na)2-3Al3(Al,Si)2Si13O36·12(H2O) Mordenite: (Ca,Na2,K2)Al2Si10O24·7(H2O)
Comments: Pink heulandite crystals up to 15 mm in fibrous white mordenite matrix. Location: Rats Nest Claim, Challis, Custer Co., Idaho, USA. Scale: 6x6x4 cm. © John Betts - Fine Minerals
Hydroxylwagnerite: Mg2(PO4)(OH)
Comments: Small cavity in white quartzite with several tan-colored hydroxylwagnerite crystals with red arrow pointing to the cavity. Location: Dora Maira Massif, Val Varaita, Piedmont, Italy. Scale: Picture size 3 mm. © John Betts - Fine Minerals
Hydrozincite: Zn5(CO3)2(OH)6
Comments: Well crystallized, colorless hydrozincite crystals encrusting a limonitic gossan matrix. Fluoresces bright blue-white under UV illumination. Location: Ojuela mine, Mapimí, Mun. de Mapimí, Durango, Mexico. Scale: 3x3x2 cm. © John Betts - Fine Minerals
Iddingsite: MgO.Fe2O3.3SiO2·4(H2O)
Comments: Red iddingsite with green olivine. Iddingsite alteration of olivine commonly seen in thin-sections is actually a fine-grained mixture of goethite+quartz+chlorite. Location: Amboy, San Bernadino County, California, USA. Scale: Specimen Size 5x5x3 cm. © John Betts - Fine Minerals
Ishikawaite: (U,Fe,Y,Ca)(Nb,Ta)O4 (?)
Comments: Blocky, metamict crystals of ishikawaite. Location: Spinelli Quarry (Spinelli prospect), South Glastonbury, Hartford Co., Connecticut, USA. Scale: 15x15x10 mm. © John Betts - Fine Minerals
Joseite: Bi4(S,Te)3
Comments: Milky quartz matrix with a 15 mm long group of metallic joseite crystals. Location: Caldbeck Fells, Cumbria, England, UK. Scale: 5x3.5x2.5 cm. © John Betts - Fine Minerals
Lepidocrocite: FeO(OH)
Comments: Translucent, red-brown crystals of lepidocrocite lining cavities in gossan matrix. Location: Eisenzecher Zug Mine, Eiserfeld, Siegen District, North Rhine-Westphalia, Germany. Scale: 7x5x3 cm. © John Betts - Fine Minerals
Leucite: KAlSi2O6
Comments: Large single crystal of dark gray leucite. Location: Roccamonfina, Caserta Province, Campania, Italy. Scale: 20x20x20 mm. © John Betts - Fine Minerals
Levyne-Ca: (Ca,Na2,K2)Al2Si4O12·6(H2O)
Comments: Vesicle in basalt matrix lined with white levyne crystals. Location: Beech Creek Quarry, Mount Vernon, Grant Co., Oregon, USA. Scale: 32x22x20 mm. © John Betts - Fine Minerals
Magnesio-arfvedsonite: NaNa2(Mg4Fe++)Si8O22(OH)2 Vitusite-(Ce): Na3(Ce,La,Nd)(PO4)2
Comments: Translucent beige-colored vitusite-(Ce) in a rim around a black magnesio-arfvedsonite crystal. Location: Yubileinaya Vein, Karnasurt Mountain, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Russia. Scale: Specimen Size 4x3x3 cm. © John Betts - Fine Minerals
Massicot: PbO
Comments: Small nugget of reddish-yellow massicot. Location: Wytheville, Wythe Co., Virginia, USA. Scale: 18x10x5 mm. © John Betts - Fine Minerals
Microlite: (Na,Ca)2Ta2O6(O,OH,F)
Comments: Brown crystal of microlite 10 mm in an albite matrix. Location: Morefield Mine, Winterham, Amelia Co., Virginia, USA. Scale: 5x4x3 cm. © John Betts - Fine Minerals
Minium: Pb++2Pb++++O4
Comments: Bright orange minium with curved, conchoidal surfaces. Location: Santa Fé Mine, Bolaños, Mun. de Bolaños, Jalisco, Mexico. Scale: 33x22x14 mm. © John Betts - Fine Minerals