K
- Kassite: CaTi2O4(OH)2 – Russian geologist Nikolai Grigor’evich Kassin (1885–1949)
- Kieserite: MgSO4•H2O and cobaltkieserite – Dietrich Georg von Kieser (1779–1862), former President, Jena Academy
- Kleberite: FeTi6O13•4H2O – German professor Will Kleber (1906–1970)
- Kobellite: Pb22Cu4(Bi,Sb)30S69 – German mineralogist Wolfgang Franz von Kobell (1803–1882)
- Kogarkoite: Na3(SO4)F – Russian scientist Lia Nikolaevna Kogarko
- Kolbeckite: ScPO4·2H2O – German mineralogist Friedrich LW Kolbeck
- Kostovite: AuCuTe4 – Bulgarian mineralogist Ivan Kostov (1913-2004)
- Krennerite: AuTe2 varying to (Au0.8,Ag0.2)Te2 – Hungarian mineralogist Joseph Krenner (1839–1920)
- Kukharenkoite-(Ce): Ba3CeF(CO3)3 – Russian mineralogist Alexander A. Kukharenko (1914–1993)
- Kunzite: – American mineralogist George Frederick Kunz (1856–1932)
Read more about this topic: List Of Minerals Named After People