disilicate
Any compound containing two silicate anions.
Synonym of sorosilicate.

disilicates
plural of disilicate

dmisteinbergite
A colourless mineral, a hexagonal polymorph of anorthite, with the chemical formula CaAl₂Si₂O₈.

dufrenoysite
A sartorite mineral with chemical formula Pb₂As₂S₅.

dumortierite
A fibrous aluminium boro-silicate mineral that occurs in various colours.

dumortierites
plural of dumortierite

earthflax
asbestos

ecospecies
ecotype

ekerite
A form of peralkaline alkali-feldspar-granite found in Norway.

elaliite
A mineral with chemical formula Fe₉PO₁₂.

elbaite
A sodium-lithium-aluminium borosilicate mineral of the tourmaline group, prized as a gemstone.

elbaites
plural of elbaite

elkinstantonite
A mineral with chemical formula Fe₄(PO₄)₂O.

emmerichite
A vitreous brown mineral with chemical formula Ba₂Na(Na,Fe²⁺)₂(Fe³⁺,Mg)Ti₂(Si₂O₇)₂O₂F₂.

enigmatite
Alternative form of aenigmatite.

enstatite
A form of pyroxene consisting solely of magnesium silicate.

enstatites
plural of enstatite

epidosite
A metamorphic epidote- and quartz-bearing rock.

epidosites
plural of epidosite

epidote
Any of a class of mixed calcium iron aluminium sorosilicates found in metamorphic rocks.

epidotes
plural of epidote

erionite
A zeolite mineral with a molecular structure similar to chabazite, usually found in weathered volcanic ash.

erionites
plural of erionite

ernstburkeite
A mineral with chemical formula Mg(CH₃SO₃)₂·12H₂O.

erythromannite
erythritol

esperite
A rare complex calcium lead zinc silicate mineral with the formula PbCa₃Zn₄(SiO₄)₄.

esperites
plural of esperite

eucryptite
A lithium-bearing aluminium silicate mineral.

eucryptites
plural of eucryptite

eudialyte
A red silicate mineral that forms in alkaline igneous rocks such as nepheline syenites.

eudialytes
plural of eudialyte

euktolite
An extrusive olivine-melilite-leucite rock with accessory biotite.

eztlite
A monoclinic blood-red mineral with the chemical formula Pb²⁺₂Fe³⁺₃(Te⁴⁺ O₃)₃(SO₄)O₂Cl.

faujasite
A zeolite mineral consisting of sodalite cages connected through hexagonal prisms.

faujasites
plural of faujasite

fayalite
Yellow, olive green, brown or black mineral with orthorhombic crystals of the olivine group, Fe₂SiO₄.

fayalites
plural of fayalite

feldspar
Any of a large group of rock-forming aluminosilicate minerals containing potassium, sodium, or calcium that, together, make up about 60% of the Earth's outer crust.

feldspars
plural of feldspar

feldspath
Alternative form of feldspar.

feldspathoid
Any of a small group of igneous, plutonic, and volcanic minerals formed in magma that did not contain enough silica to satisfy all the chemical bonds. Feldspathoids are silica-poor variants of the feldspar group.

feldspathoids
plural of feldspathoid

feldspaths
plural of feldspath

felspar
Alternative spelling of feldspar.

felspars
plural of felspar

ferrierite
Any of a group of orthorhombic zeolite minerals.

ferrierites
plural of ferrierite

ferroaugite
A ferriferous augite.

foid
Clipping of feldspathoid.

foids
plural of foid

foitite
A trigonal-ditrigonal pyramidal bluish black mineral composed of a basic, hydrated aluminate / borate / silicate of iron and sodium

foitites
plural of foitite

forsterite
A white variety of olivine that is mostly magnesium silicate, Mg₂SiO₄.

forsterites
plural of forsterite

forstorite
A white orthorhombic silicate Mg₂SiO₄ that is usually found in isomorphic mixtures with fayalite to form olivine, chrysolite, or peridot.

fougerite
A trigonal clay mineral that is chemically and structurally related to green rust.

foyaite
A K-feldspar-nepheline syenite mineral containing a proportion of ferromagnesian minerals, usually pyroxene, hornblende, and biotite.

foyaites
plural of foyaite

foyalite
A fine-grained Plutonic syenite made up of orthoclase, nepheline, hornblende, and accessory mica, sodalite, zircon, noselite, and pyroxene.

foyalites
plural of foyalite

frankhawthorneite
A monoclinic mineral with the chemical formula Cu₂Te⁶⁺O₄(OH)₂ and a leaf-green colour.

gadolinite
A dark, vitreous mineral that is a complex mixture of silicates of cerium, lanthanum, neodymium, yttrium, beryllium, and iron, with the chemical formula (Ce,La,Nd,Y)₂FeBe₂Si₂O₁₀.

gadolinites
plural of gadolinite

gagate
Agate.

gagates
plural of gagate

garewaite
An ultrabasic rock consisting mostly of olivine and augite.

garnet
A hard transparent mineral that is often used as gemstones and abrasives.
A dark red color, like that of the gemstone.

garneted
simple past and past participle of garnet

garneting
present participle and gerund of garnet

garnets
plural of garnet

garnierite
A green nickel ore found in fissures of weathered ultramafic rocks

garnierites
plural of garnierite

gehlenite
A sorosilicate with chemical formula Ca₂Al[AlSiO₇].

gehlenites
plural of gehlenite

genthite
A hydrous nickel-magnesium silicate mineral.

georgeericksenite
A vitreous, brittle, yellow mineral with the chemical formula Na₆CaMg(IO₃)6(CrO₄)₂(H₂O)₁₂.

georgerobinsonite
A bright orange-red lead chromate mineral with the chemical formula Pb₄(CrO₄)₂(OH)₂FCl.

gismondine
A zeolite mineral with the chemical formula CaAl₂Si₂O₈·₄(H₂O).

gismondines
plural of gismondine

gismondite
Alternative form of gismondine.

glaucochroite
A calcium manganese nesosilicate mineral occurring in metamorphosed limestones.

glaucochroites
plural of glaucochroite

glauconite
A greenish form of mica found in greensand.

glauconites
plural of glauconite

glaucophane
A blue amphibole mineral, a mixed aluminate of sodium, magnesium and aluminium that exhibits pleochroism, with the chemical formula Na₂(Mg,Fe²⁺)₃Al₂Si₈O₂₂(OH)₂.

glaucophanes
plural of glaucophane

gmelinite
A rare zeolite mineral related to chabazite.

gmelinites
plural of gmelinite

gobbinsite
A tektosilicate of sodium, calcium, magnesium and potassium

godovikovite
A rare mineral with the chemical formula (NH₄)Al(SO₄)₂ (or with aluminium partially replaced by iron).

granate
Archaic form of garnet.

granates
plural of granate

greenalite
A hydrated ferrous silicate related to serpentine.

greenalites
plural of greenalite

grunerite
An iron-rich amphibole related to cummingtonite.

grunerites
plural of grunerite

gunningite
A rare mineral in the kieserite group, having the chemical formula (Zn,Mn²⁺)SO₄·H₂O.

gwihabaite
A rare ammonium potassium nitrate mineral with chemical formula (NH₄,K)(NO₃), orthorhombic in form and colourless with a vitreous lustre.

hafnon
A mineral of hafnium silicate ore, having the chemical formula HfSiO₄, produced synthetically by substituting hafnium for the zirconium in zircon.

hancockite
A mineral of the epidote group, with lead and strontium replacing some of the calcium.

hardystonite
A rare purple fluorescent silicate mineral.

harmotome
A rare zeolite, a hydrated barium silicate that forms vitreous white monoclinic crystals.

harmotomes
plural of harmotome

hartite
A fossil resin (chemically, a mixture of diterpene hydrocarbons) resembling amber

hartites
plural of hartite

haughtonite
A form of mica from granites in the Scottish Highlands.

hawaiite
An olivine basalt intermediate between alkali olivine and mugearite.
A gem variety of olivine peridot.

hawaiites
plural of hawaiite

hectorite
A basic silicate of magnesium and lithium; it is a clay mineral of the montmorillonite group.

hectorites
plural of hectorite

heidornite
A colorless monoclinic-prismatic mineral with the chemical formula Na₂Ca₃B₅O₈(SO₄)₂Cl(OH)₂.

hellandite
A monoclinic borosilicate mineral containing rare earths, aluminium and calcium.

helvite
A yellowish mineral consisting chiefly of silica, beryllium, manganese, iron, and sulfur. Its chemical formula is Mn₄Be₃(SiO₄)₃S.

hemimorphite
An orthorhombic-pyramidal mineral containing hydrogen, oxygen, silicon, and zinc, a hydrated zinc silicate.

hemimorphites
plural of hemimorphite