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| Janhaugite | Jankovi´cite | Jarosewichite |
| Jarosite | Jask´olskiite | Jasmundite |
| Jeanbandyite | Jedwabite | Jeffersonite |
| Jeffreyite | Jenkinsite | Jennite |
| Jensenite | Jentschite | Jeppeite |
| Jerrygibbsite | Jervisite | Jezekite |
| Jianshuiite | Jimboite | Jimthompsonite |
| Jiningite | Jinshajiangite | Jixianite |
| Joaquinite | Joesmithite | Johachidolite |
| Johannsenite | Johillerite | Johnbaumite |
| Johninnesite | Johnsomervilleite | Johnstonotite |
| Johntomaite | Johnwalkite | Jolliffeite |
| Jonesite | Jørgensenite | Jouravskite |
| Juabite | Juanitaite | Juddite |
| Julgoldite | Julgoldite | Julgoldite |
| Julgoldite-(Mg) | Jungite | Junitoite |
| Junoite | Juonniite | Jurbanite |
| Kozulite | Kaatialaite | Kadyrelite |
| Kaersutite | Kainosite-(Y) | Kalamite |
| Kalborsite | Kalifersite | Kaliglimmer |
| Kali-harmotome | Kalininite | Kalio-magnesio-katophorite |
| Kalipyrochlore | Kalistrontite | Kalithomsonite |
| Kalkharmotome | Kalkkreuzstein | Kamaishilite |
| Kamarezite | Kambaldaite | Kamchatkite |
| Kamiokite | Kamitugaite | Kamotoite-(Y) |
| Kampfite | Kamphaugite-(Y) | Kanaekanite |
| Kanemite | Kankite | Kanoite |
| Kanonaite | Kanonerovite | Kaolinite |
| Kapitsaite-(Y) | Karasugite | Karelianite |
| Karibibite | Karinthin | Karlite |
| Karnasurtite | Karphostilbite | Karpinskyite |
| Karupmøllerite-Ca | Kashinite | Kasolite |
| Kassite | Kastningite | Kataphorite |
| Katayamalite |
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