hydroastrophyllite
A triclinic-pinacoidal dark brown mineral containing aluminum, calcium, fluorine, hydrogen, iron, manganese, niobium, oxygen, potassium, silicon, and titanium.

hydrobasaluminite
A monoclinic white mineral containing aluminum, hydrogen, oxygen, and sulfur.

hydrobiotite
A monoclinic-prismatic mineral containing aluminum, calcium, fluorine, hydrogen, iron, magnesium, oxygen, potassium, and silicon.

hydrobiotites
plural of hydrobiotite

hydroboracite
A hydrated borate mineral with the chemical formula CaMgB₆O₈(OH)₆·3(H₂O).

hydroboracites
plural of hydroboracite

hydrocalcite
Monohydrocalcite.

hydrocalcites
plural of hydrocalcite

hydrocalumite
A monoclinic-sphenoidal mineral containing aluminum, calcium, chlorine, hydrogen, and oxygen.

hydrocerussite
A form of lead carbondate, a trigonal-ditrigonal pyramidal mineral containing carbon, hydrogen, lead, and oxygen.

hydrochlorborite
A monoclinic-prismatic colorless mineral containing boron, calcium, chlorine, hydrogen, and oxygen.

hydrodelhayelite
An orthorhombic-pyramidal mineral containing aluminum, calcium, hydrogen, oxygen, potassium, and silicon.

hydrodresserite
A triclinic-pinacoidal mineral containing aluminum, barium, carbon, hydrogen, and oxygen.

hydroflurocarbon
Misspelling of hydrofluorocarbon.

hydroglauberite
An orthorhombic snow white mineral containing calcium, hydrogen, oxygen, sodium, and sulfur.

hydrogrossular
A variety of garnet sometimes used as a gemstone.

hydrohalite
A monoclinic-prismatic mineral containing chlorine, hydrogen, oxygen, and sodium.

hydrohausmannite
A mixture of hausmannite and feitknechtite.

hydrohetaerolite
A tetragonal-ditetragonal dipyramidal mineral containing hydrogen, manganese, oxygen, and zinc.

hydrohonessite
A hexagonal mineral containing hydrogen, iron, nickel, oxygen, and sulfur.

hydrombobomkulite
A monoclinic sky blue mineral containing aluminum, copper, hydrogen, nickel, nitrogen, oxygen, and sulfur.

hydromica
Synonym of illite.

hydromicas
plural of hydromica

hydromuscovite
illite.

hydromuscovites
plural of hydromuscovite

hydrophane
A semitranslucent variety of opal that becomes translucent or transparent on immersion in water.

hydrophanes
plural of hydrophane

hydroromarchite
A tetragonal-ditetragonal dipyramidal white mineral containing hydrogen, oxygen, and tin.

hydroscarbroite
A triclinic white mineral containing aluminum, carbon, hydrogen, and oxygen.

hydrotalcite
A trigonal-hexagonal scalenohedral mineral containing aluminum, carbon, hydrogen, magnesium, and oxygen.

hydrotungstite
A monoclinic-prismatic mineral containing hydrogen, oxygen, and tungsten.

hydrowoodwardite
A trigonal-hexagonal scalenohedral mineral containing aluminum, copper, hydrogen, oxygen, and sulfur.

hydroxycancrinite
A hexagonal-pyramidal mineral containing aluminum, hydrogen, oxygen, silicon, and sodium.

hydroxykenomicrolite
A microlite mineral that is a basic tantalate of sodium and tin

hydroxylclinohumite
A monoclinic-prismatic mineral containing fluorine, hydrogen, magnesium, oxygen, and silicon.

hydroxylellestadite
A mineral containing calcium, silicon, oxygen, sulfur and hydrogen

hydroxylherderite
A monoclinic-prismatic mineral containing beryllium, calcium, hydrogen, oxygen, and phosphorus.

hypercinnabar
A form of cinnabar that forms hexagonal crystals

hypnopedia
Alternative form of hypnopaedia.

hyposiderite
Synonym of limonite.

iacinct
Obsolete spelling of jacinth

ianthinite
An orthorhombic-pyramidal mineral containing hydrogen, oxygen, and uranium.

ichnusaite
A radioactive thorium molybdate mineral found in Sardinia.

ichthyophthalmite
apophyllite

icosahedrite
A mineral, Al₆₃Cu₂₄Fe₁₃, that represents the only known natural occurrence of quasicrystals.

idaite
A hexagonal-dihexagonal dipyramidal mineral containing copper, iron, and sulfur.

idiomorph
Any idiomorphous mineral.
A pattern word.

idiomorphs
plural of idiomorph

idrialin
A mineral wax obtained by distillation of idrialite.

idrialine
Synonym of idrialite.

idrialines
plural of idrialine

idrialite
A soft, orthorhombic hydrocarbon mineral, usually greenish-yellow to light brown in colour with bluish fluorescence.

idrialites
plural of idrialite

igdloite
Synonym of lueshite.

ihleite
The mineral copiapite.

ijolite
A rare igneous rock consisting essentially of nepheline and augite.

ijolites
plural of ijolite

ijussite
A kind of mafic teschenite mineral.

ikranite
A trigonal-ditrigonal pyramidal brownish yellow mineral containing calcium, cerium, chlorine, fluorine, hafnium, hydrogen, iron, lanthanum, manganese, neodymium, niobium, oxygen, potassium, silicon, sodium, strontium, titanium, and zirconium.

ikranites
plural of ikranite

ikunolite
A trigonal-hexagonal scalenohedral lead gray mineral containing bismuth, selenium, and sulfur.

ikunolites
plural of ikunolite

ilesite
A monoclinic-prismatic mineral containing hydrogen, iron, manganese, oxygen, sulfur, and zinc.

ilinskite
An orthorhombic-dipyramidal emerald green mineral containing chlorine, copper, oxygen, selenium, and sodium.

ilinskites
plural of ilinskite

ilmajokite
A monoclinic mineral containing barium, cerium, hydrogen, lanthanum, oxygen, silicon, sodium, and titanium.

ilmajokites
plural of ilmajokite

ilmenitite
A hypabyssal igneous rock composed of ilmenite with some pyrite, chalcopyrite, pyrrhotite, hypersthene and labradorite

ilmenitites
plural of ilmenitite

ilmenohaematite
Alternative form of ilmenohematite.

ilmenohematite
A solid solution between ilmenite and hematite.

ilsemannite
An amorphous mineral containing hydrogen, molybdenum, and oxygen.

ilsemannites
plural of ilsemannite

iltisite
A hexagonal-trapezohedral mineral containing bromine, chlorine, mercury, silver, and sulfur.

imandrite
An orthorhombic-dipyramidal honey yellow mineral containing calcium, iron, oxygen, silicon, and sodium.

imerinite
Synonym of magnesioarfvedsonite.

imgreite
A hexagonal-dihexagonal dipyramidal pale rose red mineral containing nickel and tellurium.

imhofite
A monoclinic-prismatic copper red mineral containing arsenic, copper, sulfur, and thallium.

imiterite
A monoclinic-prismatic white-gray mineral containing mercury, silver, and sulfur.

inaglyite
A hexagonal-dipyramidal steel gray mineral containing copper, iridium, lead, platinum, and sulfur.

incaite
A triclinic-pinacoidal lead gray mineral containing antimony, iron, lead, sulfur, and tin.

inderborite
A monoclinic-prismatic mineral containing boron, calcium, hydrogen, magnesium, and oxygen.

inderite
A monoclinic-prismatic mineral containing boron, hydrogen, magnesium, and oxygen.

indialite
A hexagonal-dihexagonal dipyramidal mineral containing aluminum, magnesium, oxygen, and silicon.

indianaite
A variety of halloysite found in Indiana.

indicatrices
plural of indicatrix

indicatrix
An ellipsoid whose three axes represent the refractive indices of an anisotropic crystal for light following different directions with respect to the crystal axes

indicolite
An indigo-blue variety of tourmaline.

indigirite
A monoclinic snow white mineral containing aluminum, carbon, hydrogen, magnesium, and oxygen.

indochinite
A tektite originally found in a strewnfield of Indo-China.

inesite
A triclinic-pinacoidal mineral containing calcium, hydrogen, manganese, oxygen, and silicon.

ingersonite
A trigonal-trapezohedral brownish yellow mineral containing antimony, calcium, fluorine, iron, magnesium, manganese, and oxygen.

ingodite
A trigonal-hexagonal scalenohedral silver white mineral containing bismuth, sulfur, and tellurium.

innatism
The view that the mind is born with certain ideas or knowledge, as opposed to the idea of the "blank slate" or tabula rasa.

innelite
A triclinic-pedial mineral containing barium, calcium, fluorine, hydrogen, magnesium, oxygen, potassium, silicon, sodium, sulfur, and titanium.

insizwaite
An isometric-diploidal tin white mineral containing antimony, bismuth, and platinum.