antecrysts
plural of antecryst

anthoinite
A white mineral that is a hydrated aluminium tungstate.

anthonyite
A monoclinic mineral containing chlorine, copper, hydrogen, and oxygen.

anthraconite
A coal-black variety of calcite or dolomite, usually emitting a foetid smell when rubbed.

anthraconites
plural of anthraconite

anthracoxene
A mixture of anthracoxenite and schlanite.
A brownish-red resin found in coal beds.

anthracoxenite
The part of anthracoxene that is insoluble in ether.

anthropoclastite
A class of mineral created from human-made materials, such as metal slag or plastic. The mineral class that makes up anthrpoclasts, anthropoclastic rock.

antiblocker
A mineral (such as talc) used to prevent blocking during the extrusion of plastic films.
A kind of software that disrupts the activity of viruses, etc. that attempt to block the activity of a computer.

antiblockers
plural of antiblocker

anticotunnite
An orthorhombic form of cotunnite.

anticrystallization
resistance to crystal formation

antiferrodistortion
distortion to the structure of a crystal lattice due to antiferromagnetism

antifluorite
A mineral crystal structure identical with that of fluorite but with the positions of the cations and anions reversed.

antifluorites
plural of antifluorite

antigorite
A brownish-green variety of serpentine.

antigorites
plural of antigorite

antimonpearceite
A monoclinic-prismatic black mineral containing antimony, arsenic, copper, silver, and sulfur.

antimonselite
An orthorhombic sulfosalt mineral containing antimony and selenium.

antiperovskite
Any crystal with a structure based on a perovskite but with the cations replaced by anions and vice versa.

antiperovskites
plural of antiperovskite

antozonite
A radioactive variety of fluorite, containing traces of elemental fluorine gas.

anyolite
A metamorphic rock composed of intergrown green zoisite, black tschermakite, and ruby.

anyolites
plural of anyolite

anyuiite
A tetragonal-ditetragonal dipyramidal mineral containing antimony, gold, and lead.

apachite
A monoclinic blue mineral containing copper, hydrogen, oxygen, and silicon.

apexite
A colourless triclinic mineral containing hydrogen, magnesium, sodium, oxygen and phosphorus.

apexites
plural of apexite

aphanesite
Synonym of clinoclase.

aphrite
A foliated or chalk-like variety of calcite.

apjohnite
A monoclinic-prismatic mineral containing aluminum, hydrogen, manganese, oxygen, and sulfur.

aplite
A fine-grained granitic rock composed mostly of quartz and feldspars.

aplites
plural of aplite

aplome
A brown or green variety of andradite containing manganese.

aplowite
A monoclinic-prismatic pink mineral containing cobalt, hydrogen, manganese, nickel, oxygen, and sulfur.

apogranite
A granite that has a high concentration of albite.

apuanite
A tetragonal-ditetragonal dipyramidal black mineral containing antimony, iron, oxygen, and sulfur.

aqualite
A pink trigonal mineral containing calcium, chlorine, hydrogen, potassium, sodium, oxygen, silicon, strontium and zirconium.

aquaprase
A bluish-green variety of chalcedony, coloured by chromium and nickel.

arakawaite
veszelyite

arakiite
A monoclinic-domatic mineral containing aluminum, arsenic, hydrogen, iron, magnesium, manganese, oxygen, and zinc.

aramayoite
A triclinic-pinacoidal mineral containing antimony, bismuth, silver, and sulfur.

arapahite
A dark, fine-grained magnetite basalt mineral.

arapahites
plural of arapahite

aravaipaite
A monoclinic-prismatic colorless mineral containing aluminum, fluorine, hydrogen, lead, and oxygen.

archaeogeology
Synonym of geoarchaeology.

arctite
A colourless mineral made of a trigonal crystal system and found in northern Russia.

arcubisite
A sulfosalt mineral occurring with cryolite in Greenland.

ardaite
A monoclinic green gray mineral containing antimony, chlorine, lead, and sulfur.

ardealite
A monoclinic-domatic mineral containing calcium, hydrogen, oxygen, phosphorus, and sulfur.

ardealites
plural of ardealite

arduinite
Synonym of mordenite.

argentobaumhauerite
A brown trigonal mineral containing silver, astatine, lead, and sulphur.

argentojarosite
A trigonal-ditrigonal pyramidal mineral containing hydrogen, iron, oxygen, silver, and sulfur.

argentopentlandite
An isometric-hexoctahedral bronze brown mineral containing iron, nickel, silver, and sulfur.

argentopyrite
An orthorhombic-dipyramidal mineral containing iron, silver, and sulfur.

argentoromeite
A silver-containing antimonite mineral

argentotennantite
An isometric-hextetrahedral mineral containing antimony, arsenic, copper, iron, silver, sulfur, and zinc.

argillite
A fine-grained sedimentary rock, intermediate between shale and slate, sometimes used as a building material

argillites
plural of argillite

argyrite
Synonym of argentite.

arhbarite
A triclinic-pedial dark blue mineral containing arsenic, cobalt, copper, hydrogen, magnesium, nickel, oxygen, and silicon.

aristarainite
A monoclinic-prismatic colorless mineral containing boron, hydrogen, magnesium, oxygen, and sodium.

arizonite
A titanate of iron, Fe₂Ti₃O₉.
A kind of iron-laden silver ore discovered during Arizona's silver rush in the 1870s.

arizonites
plural of arizonite

arkansite
Synonym of brookite.

arkose
An arenite sandstone consisting of at least 25% feldspar grains.

arkoses
plural of arkose

arksudite
Chiolite.

arksutite
chiolite

armalcolite
An orthorhombic mineral first discovered on the Moon.

armalcolites
plural of armalcolite

armangite
A trigonal-rhombohedral black mineral containing arsenic, carbon, hydrogen, manganese, and oxygen.

armenite
An orthorhombic-pyramidal mineral containing aluminum, barium, calcium, hydrogen, oxygen, and silicon.

armenites
plural of armenite

arminite
Synonym of antlerite.

armstrongite
A monoclinic-sphenoidal mineral containing calcium, hydrogen, oxygen, silicon, and zirconium.

arnimite
Synonym of antlerite.

arquifoux
Alternative form of alquifou.

arrojadite
A monoclinic-domatic mineral containing aluminum, calcium, fluorine, hydrogen, iron, manganese, oxygen, phosphorus, potassium, and sodium.

arsenbrackebuschite
A monoclinic-prismatic honey yellow mineral containing arsenic, hydrogen, iron, lead, oxygen, and zinc.

arsendescloizite
An orthorhombic-disphenoidal mineral containing arsenic, hydrogen, lead, oxygen, and zinc.

arseniopleite
A monoclinic-prismatic mineral containing arsenic, calcium, iron, lead, magnesium, manganese, oxygen, and sodium.

arseniosiderite
A monoclinic-prismatic mineral containing arsenic, calcium, hydrogen, iron, and oxygen.

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

arsenocrandallite
A trigonal-ditrigonal pyramidal mineral containing aluminum, arsenic, calcium, hydrogen, oxygen, phosphorus, and strontium.

arsenoferrite
Synonym of cafarsite.

arsenoflorencite
An arsenic-rich variety of the mineral florencite.

arsenogorceixite
A trigonal-hexagonal scalenohedral mineral containing aluminum, arsenic, barium, fluorine, hydrogen, oxygen, and phosphorus.

arsenogoyazite
A trigonal-hexagonal scalenohedral mineral containing aluminum, arsenic, barium, calcium, fluorine, hydrogen, oxygen, phosphorus, and strontium.

arsenohauchecornite
A tetragonal-ditetragonal dipyramidal bronze mineral containing arsenic, bismuth, nickel, and sulfur.

arsenolamprite
A shiny grey-white form of arsenic composed of orthorhombic crystals.

arsenomiargyrite
Synonym of smithite.

arsenopalladinite
A triclinic-pedial silver white mineral containing antimony, arsenic, and palladium.

arsenpolybasite
A monoclinic-prismatic black mineral containing antimony, arsenic, copper, silver, and sulfur.

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

arsenuranospathite
A tetragonal-dipyramidal mineral containing aluminum, arsenic, hydrogen, oxygen, and uranium.