fillowite
A trigonal-rhombohedral mineral containing calcium, iron, manganese, oxygen, phosphorus, and sodium.

fingerite
A very rare triclinic-pinacoidal black mineral containing copper, oxygen, and vanadium.

finnemanite
A hexagonal-pyramidal mineral containing arsenic, chlorine, lead, and oxygen.

fiorite
A variety of opal occurring in the cavities of volcanic tuff, having a pearly lustre and forming botryoidal masses.

fireblende
Synonym of pyrostilpnite.

fischesserite
An isometric-gyroidal silver white mineral containing gold, selenium, and silver.

fiveling
A twin crystal formed from five individuals

fivelings
plural of fiveling

flagstaffite
An orthorhombic-pyramidal yellowish white mineral containing carbon, hydrogen, and oxygen.

flajolotite
An iron antimonate mineral.

fleischerite
A hexagonal-dihexagonal dipyramidal mineral containing germanium, hydrogen, lead, oxygen, and sulfur.

flexodomain
Any of a set of regions of a nematic liquid crystal formed in the presence of an alternating electric field

flexodomains
plural of flexodomain

flexoelectricity
The mechanoelectrical production of electricity by bending a material (especially some types of liquid crystal)

flinkite
A mineral containing arsenic, hydrogen, manganese, and oxygen.

flinkites
plural of flinkite

florenskyite
An orthorhombic-dipyramidal cream white mineral containing iron, nickel, phosphorus, and titanium.

florensovite
An isometric-hexoctahedral black mineral containing antimony, chromium, copper, and sulfur.

flowtop
The solid crust on a moving lava flow.

fluckite
A triclinic-pinacoidal mineral containing arsenic, calcium, hydrogen, manganese, and oxygen.

fluellite
An orthorhombic-dipyramidal mineral containing aluminum, fluorine, hydrogen, oxygen, and phosphorus.

fluellites
plural of fluellite.

fluoborite
A hexagonal-dipyramidal mineral containing boron, fluorine, hydrogen, magnesium, and oxygen.

fluocollophanite
Synonym of apatite.

fluor
The mineral fluorite.
A flow or flux.
Menstrual periods.

fluorannite
A fluorine analog of annite

fluorannites
plural of fluorannite

fluorcaphite
A hexagonal-pyramidal mineral containing calcium, cerium, fluorine, oxygen, phosphorus, sodium, and strontium.

fluorhydroxyapatite
The tooth mineral formed by the action of fluoride on hydroxyapatite

fluornatromicrolite
An isometric-hexoctahedral green mineral containing bismuth, calcium, fluorine, oxygen, sodium, and tantalum.

fluorocannilloite
A monoclinic-prismatic greenish gray mineral containing aluminum, calcium, fluorine, magnesium, oxygen, and silicon.

fluorohydroxyapatite
Alternative form of fluorhydroxyapatite.

fluoroid
A tetrakis hexahedron.

fluoroids
plural of fluoroid

fluoroperovskite
Any of a group of minerals of general formula MM^'F₃ where M and M^' are manganese, barium or any alkali metal

fluoroperovskites
plural of fluoroperovskite

fluorophlogopite
A fluorine-rich variety of phlogopite.

fluorophlogopites
plural of fluorophlogopite

fluorphlogopite
Alternative form of fluorophlogopite.

fluors
plural of fluor

fluorvesuvianite
A tetragonal-ditetragonal dipyramidal mineral containing aluminum, calcium, fluorine, hydrogen, iron, magnesium, manganese, oxygen, and silicon (a fluorine analog of vesuvianite.

foggite
An orthorhombic-disphenoidal mineral containing aluminum, calcium, hydrogen, oxygen, and phosphorus.

folgerite
Synonym of pentlandite.

fontanite
A monoclinic-prismatic honey yellow mineral containing calcium, carbon, hydrogen, oxygen, and uranium.

foordite
A monoclinic-prismatic brownish yellow mineral containing niobium, oxygen, tantalum, and tin.

formicaite
A tetragonal-trapezohedral mineral containing calcium, carbon, hydrogen, and oxygen.

foshagite
A monoclinic-prismatic snow white mineral containing calcium, hydrogen, oxygen, and silicon.

foshallasite
A monoclinic snow white mineral containing calcium, hydrogen, oxygen, and silicon.

foucherite
Synonym of delvauxite.

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

fowlerite
A variety of rhodonite that contains zinc.

fowlerites
plural of fowlerite

fraipontite
A monoclinic-domatic mineral containing aluminum, hydrogen, oxygen, silicon, and zinc.

francevillite
An orthorhombic-dipyramidal mineral containing barium, hydrogen, lead, oxygen, uranium, and vanadium.

franciscanite
A brownish-red trigonal mineral containing manganese and vanadium found in California.

francisite
An orthorhombic-dipyramidal light green mineral containing bismuth, chlorine, copper, oxygen, and selenium.

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

francoanellite
A trigonal yellowish white mineral containing aluminum, hydrogen, iron, oxygen, phosphorus, potassium, and sodium.

francolite
Synonym of lewistonite (“variety of fluorapatite”)

francolites
plural of francolite

franconite
A monoclinic white mineral containing hydrogen, niobium, oxygen, and sodium.

frankamenite
A triclinic-pedial mineral containing calcium, fluorine, hydrogen, manganese, oxygen, potassium, silicon, and sodium.

frankdicksonite
An isometric-hexoctahedral colorless mineral containing barium and fluorine.

franklinfurnaceite
A monoclinic-sphenoidal dark brown mineral containing aluminum, calcium, hydrogen, iron, manganese, oxygen, silicon, and zinc.

franklinite
An isometric-hexoctahedral mineral containing iron, manganese, oxygen, and zinc.

franklinites
plural of franklinite

franklinphilite
A triclinic mineral containing aluminum, hydrogen, iron, magnesium, manganese, oxygen, potassium, silicon, sodium, and zinc.

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

franzinite
A trigonal-trapezohedral pearl white mineral containing aluminum, calcium, hydrogen, oxygen, potassium, silicon, sodium, and sulfur.

freboldite
A hexagonal-dihexagonal dipyramidal mineral containing cobalt and selenium.

fredrikssonite
An orthorhombic-dipyramidal reddish brown mineral containing boron, iron, magnesium, manganese, and oxygen.

fredrikssonites
plural of fredrikssonite

freedite
A monoclinic-prismatic greenish yellow mineral containing arsenic, chlorine, copper, lead, and oxygen.

freibergite
A complex cubic sulfosalt mineral of silver, copper, iron, antimony, and arsenic.

freibergites
plural of freibergite

fresnoite
A tetragonal-ditetragonal pyramidal mineral containing barium, oxygen, silicon, and titanium.

freudenbergite
A monoclinic-prismatic mineral containing iron, oxygen, sodium, and titanium.

friedelite
A monoclinic-prismatic mineral containing chlorine, hydrogen, manganese, oxygen, and silicon.

friedrichite
An orthorhombic-pyramidal silver gray mineral containing bismuth, copper, lead, and sulfur.

frohbergite
An orthorhombic-dipyramidal mineral containing iron and tellurium.

frolovite
A triclinic-pinacoidal mineral containing boron, calcium, hydrogen, and oxygen.

frondelite
An orthorhombic-dipyramidal mineral containing hydrogen, iron, manganese, oxygen, and phosphorus.

frondellite
Alternative form of frondelite.

froodite
An opaque metallic grey mineral containing bismuth and palladium.

froodites
plural of froodite

fruchtschiefer
A local variety of contact metamorphic rock derived from argillite.

fuchsite
A green variety of muscovite

fuchsites
plural of fuchsite

fuenzalidaite
A trigonal-hexagonal scalenohedral mineral containing hydrogen, iodine, magnesium, oxygen, potassium, sodium, and sulfur.

fukalite
A mineral comprising mostly calcium, oxygen, and silicon.

fullerite
The solid form of a fullerene.

fullerites
plural of fullerite

funkite
Synonym of hedenbergite.

fupingqiuite
Synonym of varulite.

furongite
A triclinic-pinacoidal mineral containing aluminum, hydrogen, oxygen, phosphorus, and uranium.

furutobeite
A monoclinic-domatic gray mineral containing copper, lead, silver, and sulfur.