Minerals

Kaatialaite

Kadyrelite

Hardness: 2.5 - 3

Kaersutite

Hardness: 5 - 6

Kahlenbergite

Kahlerite

Hardness: 2 - 2.5

Kainite

Hardness: 2.5 - 3

Kainosite

Kainosite-(y)

Hardness: 5 - 6

Kainotropite

Kaitianite

Kalborsite

Hardness: 6

Kalgoorlieite

Kaliborite

Hardness: 4 - 4.5

Kalicinite

Hardness: 1 - 2

Kalifersite

Hardness: 2

Kalininite

Hardness: 5

Kalinite

Hardness: 2

Kaliochalcite

Hardness: 4

Kaliophilite

Hardness: 5.5 - 6

Kalistrontite

Hardness: 2

Kalithallite

Kalsilite

Hardness: 6

Kalungaite

Kamaishilite

Kamarizaite

Hardness: 3

Kambaldaite

Kamchatkite

Hardness: 3.5

Kamenevite

Kamiokite

Hardness: 4.5

Kamitugaite

Kamotoite-(y)

Kampelite

Hardness: 1

Kampfite

Hardness: 3

Kamphaugite-(y)

Hardness: 2 - 3

Kanemite

Hardness: 4

Kangite

Kaňkite

Hardness: 2 - 3

Kannanite

Hardness: 6

Kanoite

Hardness: 6

Kanonaite

Hardness: 6.5

Kanonerovite

Hardness: 2.5 - 3

Kapellasite

Kapitsaite-(y)

Hardness: 5.5

Kapundaite

Hardness: 3

Kapustinite

Hardness: 6

Karasugite

Karchevskyite

Hardness: 2

Karelianite

Hardness: 8 - 9

Karenwebberite

Karibibite

Karlite

Hardness: 5.5

Karnasurtite-(ce)

Hardness: 2

Karpenkoite

Karpinskite

Hardness: 2.5 - 3

Karpovite

Hardness: 2

Karupmøllerite-ca

Hardness: 5

Kasatkinite

Kashinite

Hardness: 7.5

Kaskasite

Hardness: 1

Kasolite

Hardness: 4 - 5

Kassite

Hardness: 5

Kastningite

Hardness: 1 - 2

Katayamalite

Katerinopoulosite

Hardness: 2.5

Katiarsite

Katoite

Hardness: 5 - 6

Katophorite

Hardness: 5

Katoptrite

Hardness: 5.5

Katsarosite

Kawazulite

Hardness: 1.5

Kayrobertsonite

Kazakhstanite

Hardness: 2.5

Kazakovite

Hardness: 4

Kazanskyite

Hardness: 3

Keckite

Hardness: 4.5

Kegelite

Kegginite

Hardness: 2

Keilite

Keithconnite

Hardness: 5

Keiviite-(y)

Hardness: 4 - 5

Keiviite-(yb)

Hardness: 4 - 5

Keldyshite

Hardness: 3.5 - 4.5

Kellyite

Hardness: 2.5

Kelyanite

Hardness: 3 - 3.5

Kemmlitzite

Hardness: 5.5

Kempite

Hardness: 3.5

Kenhsuite

Hardness: 2 - 3

Kenngottite

Hardness: 4 - 5

Kenoargentotennantite-(fe)

Kenoargentotetrahedrite-(fe)

Kenoargentotetrahedrite-(zn)

Kenoplumbomicrolite

Hardness: 6

Kenotobermorite

Kentbrooksite

Hardness: 5 - 6

Kentrolite

Hardness: 5

Kenyaite

Keplerite

Kerimasite

Hardness: 7

Kermesite

Hardness: 1 - 1.5

Kernite

Hardness: 2.5

Kernowite

Kesebolite-(ce)

Hardness: 5 - 6

Kesterite

Hardness: 4.5

Kettnerite

Keutschite

Keyite

Hardness: 3.5 - 4

Keystoneite

Khademite

Khaidarkanite

Hardness: 2.5

Khamrabaevite

Hardness: 9 - 9.5

Khanneshite

Hardness: 3 - 4

Kharaelakhite

Khatyrkite

Hardness: 5

Khesinite

Hardness: 6

Khibinskite

Hardness: 4.5 - 5.5

Khinite

Hardness: 3

Khmaralite

Hardness: 7

Khomyakovite

Hardness: 5 - 6

Khorixasite

Khrenovite

Khristovite-(ce)

Hardness: 5

Khurayyimite

Khvorovite

Hardness: 5 - 5.5

Kiddcreekite

Hardness: 4

Kidwellite

Hardness: 3

Kieftite

Hardness: 5 - 5.5

Kieserite

Hardness: 3.5

Kihlmanite-(ce)

Hardness: 3

Kilchoanite

Killalaite

Kimrobinsonite

Hardness: 2.5

Kimuraite-(y)

Hardness: 2.5

Kimzeyite

Hardness: 7

Kingite

Kingsgateite

Kingsmountite

Hardness: 2.5

Kingstonite

Kinichilite

Hardness: 2

Kinoite

Hardness: 2.5

Kinoshitalite

Hardness: 2.5 - 3

Kintoreite

Hardness: 4

Kipushite

Hardness: 4

Kircherite

Hardness: 5.5

Kirchhoffite

Hardness: 6 - 6.5

Kirkiite

Hardness: 3.5

Kirschsteinite

Hardness: 5.5

Kishonite

Kitagohaite

Hardness: 3.5

Kitkaite

Hardness: 3.5

Kittatinnyite

Hardness: 4

Kladnoite

Klajite

Hardness: 2 - 3

Klaprothite

Hardness: 2.5

Klebelsbergite

Hardness: 3.5 - 4

Kleberite

Kleemanite

Kleinite

Hardness: 3.5

Klöchite

Klockmannite

Hardness: 2 - 2.5

Klyuchevskite

Hardness: 3.5

Knasibfite

Knebelite

Knorringite

Hardness: 6 - 7

Koashvite

Hardness: 6

Kobeite-(y)

Hardness: 5.5

Kobellite

Hardness: 2.5 - 3

Kobokoboite

Hardness: 2

Kobyashevite

Hardness: 2.5

Kochite

Hardness: 5

Kochkarite

Hardness: 2 - 2.5

Kochsándorite

Hardness: 2 - 2.5

Kodamaite

Koechlinite

Koenenite

Hardness: 1.5

Kogarkoite

Hardness: 3.5

Kojonenite

Kokchetavite

Kokinosite

Hardness: 1.5

Koksharovite

Hardness: 4.5

Koktaite

Kolarite

Kolbeckite

Hardness: 3 - 5

Kolfanite

Hardness: 2.5

Kolicite

Hardness: 4.5

Kolitschite

Hardness: 4

Kollerite

Kolovratite

Hardness: 2 - 3

Kolskyite

Hardness: 3

Kolwezite

Hardness: 4

Kolymite

Hardness: 4

Komarovite

Hardness: 1 - 2

Kombatite

Hardness: 2 - 3

Komkovite

Hardness: 3 - 4

Konderite

Hardness: 5.5

Koninckite

Hardness: 3.5 - 4

Kononovite

Hardness: 3

Konyaite

Hardness: 2.5

Koragoite

Hardness: 4 - 5

Koritnigite

Hardness: 2

Kornelite

Kornerupine

Hardness: 7

Korobitsynite

Hardness: 5

Korshunovskite

Hardness: 2

Koryakite

Korzhinskite

Kosmochlor

Hardness: 6

Kosnarite

Hardness: 4.5

Kostovite

Hardness: 2 - 2.5

Kostylevite

Hardness: 5

Kotoite

Hardness: 6.5

Kottenheimite

Hardness: 2 - 2.5

Köttigite

Hardness: 2.5 - 3

Kotulskite

Hardness: 4 - 4.5

Koutekite

Hardness: 3.5

Kovdorskite

Hardness: 4

Kozoite-(la)

Kozoite-(nd)

Kozyrevskite

Hardness: 3.5

Kraisslite

Hardness: 3 - 4

Krasheninnikovite

Hardness: 2.5 - 3

Krásnoite

Krasnoshteinite

Krasnovite

Hardness: 2

Kratochvílite

Krausite

Hardness: 2.5

Krauskopfite

Hardness: 4

Krautite

Hardness: 3 - 4

Kravtsovite

Kreiterite

Kremersite

Krennerite

Hardness: 2 - 3

Krettnichite

Hardness: 4.5

Kribergite

Krieselite

Hardness: 5.5 - 6.5

Krinovite

Hardness: 5.5 - 7

Kristiansenite

Hardness: 5.5 - 6

Krivovichevite

Hardness: 3

Kröhnkite

Hardness: 2.5 - 3

Krotite

Kroupaite

Hardness: 2

Kruijenite

Krupičkaite

Krupkaite

Hardness: 3.5 - 4

Krut'aite

Hardness: 4

Krutovite

Hardness: 5.5

Kryachkoite

Kryzhanovskite

Hardness: 3.5 - 4

Ktenasite

Hardness: 2 - 2.5

Kuannersuite-(ce)

Hardness: 4.5 - 5.5

Kudriavite

Kudryavtsevaite

Hardness: 6

Kufahrite

Kukharenkoite

Kukharenkoite-(ce)

Hardness: 4.5

Kukharenkoite-(la)

Hardness: 4

Kukisvumite

Hardness: 5.5 - 6

Kuksite

Hardness: 5

Kulanite

Hardness: 4

Kuliginite

Kuliokite-(y)

Hardness: 4 - 5

Kulkeite

Hardness: 2

Kullerudite

Hardness: 5.5 - 6.5

Kumdykolite

Kummerite

Kumtyubeite

Hardness: 5 - 6

Kunatite

Kupčíkite

Hardness: 3

Kupletskite

Hardness: 4

Kupletskite-(cs)

Hardness: 4

Kuramite

Hardness: 5

Kuranakhite

Hardness: 4 - 5

Kuratite

Kurchatovite

Hardness: 4.5

Kurgantaite

Hardness: 6 - 6.5

Kurilite

Hardness: 3

Kurnakovite

Hardness: 2.5 - 3

Kurumsakite

Kusachiite

Hardness: 4.5

Kushiroite

Kutinaite

Hardness: 4.5

Kutnohorite

Hardness: 3.5 - 4

Kuvaevite

Kuzelite

Hardness: 1.5 - 2

Kuzmenkoite-mn

Hardness: 5

Kuzmenkoite-zn

Hardness: 5

Kuzminite

Hardness: 1.5

Kuznetsovite

Hardness: 2.5 - 3

Kvanefjeldite

Hardness: 5.5 - 6

Kyanoxalite

Kyawthuite

Hardness: 5.5

Kyrgyzstanite

Hardness: 2 - 2.5

Kyzylkumite