kulkeite
A monoclinic colorless mineral containing aluminum, hydrogen, magnesium, oxygen, silicon, and sodium.

kullerudite
An orthorhombic-dipyramidal lead gray mineral containing nickel and selenium.

kunzite
A pink- to lilac-colored gemstone, a variety of spodumene.

kunzites
plural of kunzite

kupcikite
A monoclinic-prismatic gray mineral containing antimony, bismuth, cadmium, copper, iron, lead, silver, and sulfur.

kupletskite
A monoclinic-prismatic mineral containing fluorine, hydrogen, iron, manganese, niobium, oxygen, potassium, silicon, sodium, and titanium.

kuramite
A tetragonal-scalenohedral neutral gray mineral containing copper, sulfur, and tin.

kuranakhite
An orthorhombic mineral containing lead, manganese, oxygen, and tellurium.

kurchatovite
An orthorhombic-disphenoidal light gray mineral containing boron, calcium, iron, magnesium, manganese, and oxygen.

kurgantaite
A triclinic-pedial mineral containing boron, calcium, chlorine, hydrogen, oxygen, and strontium.

kurnakovite
A hydrated borate mineral.

kurnakovites
plural of kurnakovite

kurumsakite
An orthorhombic mineral containing aluminum, copper, hydrogen, nickel, oxygen, silicon, vanadium, and zinc.

kusachiite
A tetragonal-ditetragonal dipyramidal black mineral containing bismuth, copper, and oxygen.

kuskite
A supposed form of scapolite, later found to be quartz.

kusuite
Original name given to the mineral group later renamed wakefieldite.

kusuites
plural of kusuite

kuzelite
A trigonal-pyramidal white mineral containing aluminum, calcium, hydrogen, oxygen, and sulfur.

kuzmenkoite
A labuntsovite mineral.

kuzminite
A tetragonal-ditetragonal dipyramidal mineral containing bromine, chlorine, and mercury.

kuznetsovite
An isometric-tetartoidal mineral containing arsenic, chlorine, mercury, and oxygen.

kvanefjeldite
An orthorhombic-dipyramidal violet pink mineral containing calcium, hydrogen, manganese, oxygen, silicon, and sodium.

kyanoxalite
A pale blue hexagonal mineral containing aluminium, hydrogen, sodium, carbon, oxygen and silicon.

kyschtymite
A medium-grained anorthite rock consisting largely of corundum.

kyujitai
Alternative form of kyūjitai.

kyzylkumite
An opaque black monoclinic mineral.

laachite
A brown monoclinic mineral containing calcium, iron, manganese, niobium, oxygen, titanium and zirconium

labradoritite
An igneous rock composed predominantly of labradorite.

lacroixite
A monoclinic-prismatic mineral containing aluminum, fluorine, oxygen, phosphorus, and sodium.

laffittite
A monoclinic-domatic dark red mineral containing arsenic, mercury, silver, and sulfur.

laflammeite
A monoclinic-prismatic brownish cream mineral containing lead, palladium, and sulfur.

lagonite
An earthy, hydrous iron borate, H¹⁴Fe⁴Bo¹²O³¹ + 2[Fe²]ᵛⁱBo⁶O¹² + 7Aq

lagonites
plural of lagonite

lagunite
Alternative spelling of lagonite.

lagunites
plural of lagunite

laitakarite
A trigonal-hexagonal scalenohedral galena white mineral containing bismuth, selenium, and sulfur.

lakarpite
A kind of nepheline syenite mineral.

laminite
Any sedimentary rock composed of very fine layers.

laminites
plural of laminite

lammerite
A monoclinic-prismatic dark green mineral containing arsenic, copper, oxygen, and phosphorus.

lampadite
A cupreous variety of wad.

lamprophyllite
A monoclinic-prismatic mineral containing barium, fluorine, hydrogen, oxygen, silicon, sodium, strontium, and titanium.

lamprophyllites
plural of lamprophyllite

lamprophyre
An uncommon, small-volume ultrapotassic igneous rock primarily occurring as dikes, lopoliths, laccoliths, stocks and small intrusions.

lamprophyres
plural of lamprophyre

landauite
A trigonal-rhombohedral black mineral containing iron, lead, manganese, oxygen, potassium, sodium, titanium, and zinc.

landesite
An orthorhombic-dipyramidal brown mineral containing hydrogen, iron, magnesium, manganese, oxygen, and phosphorus.

langanite
A piezoelectric crystal variant of langasite, where niobium substitutes for silicon, with formula La₃Ga_(5.5)Nb_(0.5)O₁₄.

langisite
A hexagonal-dihexagonal dipyramidal pinkish buff mineral containing arsenic, cobalt, and nickel.

langite
A monoclinic-domatic mineral containing copper, hydrogen, oxygen, and sulfur.

lanmuchangite
An isometric-diploidal mineral containing aluminum, hydrogen, oxygen, sulfur, and thallium.

lannonite
A tetragonal white mineral containing aluminum, calcium, fluorine, hydrogen, magnesium, oxygen, and sulfur.

laphamite
A monoclinic-prismatic dark red mineral containing arsenic, selenium, and sulfur.

lapieite
An orthorhombic-disphenoidal steel gray mineral containing antimony, copper, nickel, and sulfur.

lardalite
A nepheline monzonite mineral.

lardalites
plural of lardalite

larderellite
A dimorph of ammonioborate. A monoclinic-prismatic mineral containing boron, hydrogen, nitrogen, and oxygen.

larisaite
A monoclinic-sphenoidal yellow mineral containing calcium, hydrogen, oxygen, potassium, selenium, sodium, and uranium.

larosite
An orthorhombic black mineral containing bismuth, copper, lead, silver, and sulfur.

larsenite
An orthorhombic-dipyramidal white mineral containing lead, oxygen, silicon, and zinc.

lasque
A diamond having a flat shape.

lasques
plural of lasque

lassolatite
A fibrous variety of opal.

latrappite
An orthorhombic-dipyramidal black mineral containing calcium, iron, magnesium, niobium, oxygen, sodium, and titanium.

laubmannite
A discredited mineral, found to be a mixture of dufrenite, kidwellite, and beraunite.

laueite
A triclinic-pinacoidal mineral containing hydrogen, iron, manganese, oxygen, and phosphorus.

launayite
A monoclinic-prismatic lead gray mineral containing antimony, lead, and sulfur.

laurdalite
A grey or pinkish nepheline syenite mineral.

laurdalites
plural of laurdalite

laurelite
A hexagonal-trigonal dipyramidal colorless mineral containing chlorine, fluorine, and lead.

laurentthomasite
A cobalt-blue to green-yellow mineral containing magnesium, potassium, beryllium, aluminium, silicon and oxygen.

laurionite
An orthorhombic-dipyramidal mineral containing chlorine, hydrogen, lead, and oxygen.

lausenite
A monoclinic white mineral containing hydrogen, iron, oxygen, and sulfur.

lautarite
A monoclinic-prismatic mineral containing calcium, iodine, and oxygen.

lautenthalite
A monoclinic-prismatic mineral containing copper, hydrogen, lead, oxygen, and sulfur.

lavendulan
An orthorhombic mineral containing arsenic, calcium, chlorine, copper, hydrogen, oxygen, and sodium.

lavrentievite
A monoclinic mineral containing bromine, chlorine, mercury, and sulfur.

lawrencite
A trigonal-hexagonal scalenohedral mineral containing chlorine, iron, and nickel.

lawsonbauerite
A monoclinic-prismatic mineral containing hydrogen, magnesium, manganese, oxygen, sulfur, and zinc.

lazarenkoite
An orthorhombic light orange mineral containing arsenic, calcium, hydrogen, iron, and oxygen.

lazaridisite
A colourless monoclinic mineral containing cadmium, sulfur, hydrogen, and oxygen.

leadamalgam
A tetragonal-ditetragonal dipyramidal silver white mineral containing lead and mercury.

leakeite
A monoclinic-prismatic dark red mineral containing hydrogen, iron, lithium, magnesium, oxygen, silicon, and sodium.

lecontite
An orthorhombic-disphenoidal colorless mineral containing hydrogen, nitrogen, oxygen, potassium, sodium, and sulfur.

ledmorite
A coarse-grained nepheline syenite characteristic of the Ledmore river in Scotland

ledmorites
plural of ledmorite

lefkasbestos
Synonym of chrysotile.

legrandite
A monoclinic-prismatic mineral containing arsenic, hydrogen, oxygen, and zinc.

lehiite
A discredited mineral, now known to be crandallite.

lehnerite
A monoclinic-prismatic mineral containing hydrogen, manganese, oxygen, phosphorus, and uranium.

lehrbachite
A selenide of lead and mercury.

leifite
A trigonal-hexagonal scalenohedral mineral containing aluminum, beryllium, fluorine, hydrogen, oxygen, silicon, and sodium.