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Kampfite: Ba12(Si11Al5)O31(CO3)8Cl5
Comments: Light, bluish-gray crystalline kampfite. Location: Esquire #1 Claim, Rush Creek, Fresno Co., California, USA. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag
Kamphaugite-(Y): (Ca1.84REEx)(Y1.46REE0.54-x)(CO3)4(OH)1.65·2(H2O)
Comments: Small white crystals of kamphaugite-(Y). Location: Tørdal (Hjøndalen), Telemark, Norway. Scale: Picture size 3 mm. © Thomas Witzke / Abraxas-Verlag
Kankite: Fe+++AsO4·3.5(H2O)
Comments: Greenish botryoidal aggregates of kankite. Location: Reiche Zeche Mine, Freiberg, Freiberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag
Karpatite: C24H12
Comments: Pale greenish karpatite with minor red cinnabar. Location: 4th of July mine, New Idria district, San Benito Co., California, USA. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Kashinite: (Ir,Rh)2S3 Laurite: RuS2
Comments: Gray kashinite with darker gray laurite. Polished section (from microprobe analysis) 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
Kastningite: (Mn++,Fe++,Mg)Al2(PO4 )2(OH)2·8(H2O)
Comments: Colorless crystals of kastningite. Location: Silbergrube Quarry, Waidhaus, Vohenstrauß, Oberpfalz, Bavaria, Germany. Scale: Picture size 1 mm. © Thomas Witzke / Abraxas-Verlag
Kettnerite: CaBi(CO3)OF
Comments: Brown crystals of kettnerite. Location: Shaft 250, Schlema-Hartenstein area, Erzgebirge, Saxony, Germany. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag
Keystoneite: Mg0.5[Ni++Fe++(TeO3)3]·4.5(H2O)
Comments: Yellow, feathery keystoneite on quartz. Location: Mcalpine Mine, Moccasin, Tuolumne Co., California, USA. Scale: Picture size 2 mm. © Thomas Witzke / Abraxas-Verlag
Kingite: Al3(PO4)2(F,OH)2·8(H2O,OH)
Comments: White flakes of kingite in matrix. Location: Ronneburg U deposit, Gera district, Thuringia, Germany. Scale: Picture size 1.3 mm. © Thomas Witzke / Abraxas-Verlag
Klebelsbergite: Sb+++4O4(OH)2(SO4)
Comments: Small, acicular sprays of klebelsbergite with yellow crystals of sulfur on stibnite. Location: Pereta Mine, Grosseto Province, Tuscany, Italy. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag