allemontites
plural of allemontite

allochalcoselite
A brown monoclinic mineral containing chlorine, copper, oxygen, selenium, and lead.

allochroite
a type of Garnet.

alloclasite
A brittle monoclinic sulfosalt mineral of the arsenopyrite group.

alloformation
The fundamental allostratigraphic unit, which may be considered part of an allogroup and may be made up of smaller allomembers; A mappable stratiform body of sedimentary rock that is bounded by discontinuities.

alloformations
plural of alloformation

allomorphite
A pseudomorph of baryte.

allopalladium
Synonym of stibiopalladinite.

allothiomorph
A constituent of a metamorphic rock retaining the original shape and crystal structure.

allotriomorph
A mineral that did not develop its otherwise typical external crystal form because of late crystallization between earlier formed crystals, typical of matrix minerals in rapidly crystallizing volcanic lavas and shallow igneous intrusions.

allotriomorphs
plural of allotriomorph

allotwin
A twin crystal whose individuals are oriented crystal associations of different polytypes of the same compound

allotwins
plural of allotwin

alluaivite
A trigonal-hexagonal scalenohedral mineral containing calcium, chlorine, hydrogen, manganese, niobium, oxygen, silicon, sodium, and titanium.

almagras
plural of almagra

almandite
Almandine.

almandites
plural of almandite

almarudite
A hexagonal-dihexagonal dipyramidal mineral containing aluminum, beryllium, calcium, iron, magnesium, manganese, oxygen, potassium, silicon, sodium, and zinc.

almeidaite
A rare mineral that belongs to the crichtonite group and contains silver, germanium, and sulfur.

almeriite
Synonym of natroalunite.

almondines
plural of almondine

almondite
Alternative form of almandite.

almondites
plural of almondite

alquifou
A lead ore found in Cornwall, England, and used to give a green glaze to pottery.

alquifoux
Alternative form of alquifou.

altaite
Lead telluride, an isometric yellowish-white mineral of the galena group.

althausite
An orthorhombic-pyramidal gray mineral containing fluorine, hydrogen, magnesium, oxygen, and phosphorus.

althupite
A triclinic-pinacoidal yellow mineral containing aluminum, hydrogen, oxygen, phosphorus, thorium, and uranium.

altisite
A monoclinic-prismatic white mineral containing aluminum, chlorine, oxygen, potassium, silicon, sodium, and titanium.

alumian
natroalunite

alumohydrocalcite
A triclinic-pinacoidal mineral containing aluminum, calcium, carbon, hydrogen, and oxygen.

alumoklyuchevskite
A monoclinic-sphenoidal dark green mineral containing aluminum, copper, oxygen, potassium, and sulfur.

alumopharmacosiderite
An isometric-hextetrahedral white mineral containing aluminum, arsenic, hydrogen, oxygen, and potassium.

alumotantite
An orthorhombic-dipyramidal mineral containing aluminum, oxygen, and tantalum.

alumotungstite
An isometric greenish yellow mineral containing aluminum, hydrogen, oxygen, and tungsten.

alumstone
alunite

alumstones
plural of alumstone

alvanite
A monoclinic-prismatic mineral containing aluminum, hydrogen, nickel, oxygen, vanadium, and zinc.

alvar
A limestone pavement.

alvars
plural of alvar

alvikite
A fine-grained form of sovite

alvikites
plural of alvikite

amakinite
A trigonal-hexagonal scalenohedral mineral containing hydrogen, iron, magnesium, manganese, and oxygen.

amarantite
A triclinic-pinacoidal mineral containing hydrogen, iron, oxygen, and sulfur.

amarillite
A monoclinic-prismatic mineral containing hydrogen, iron, oxygen, sodium, and sulfur.

amazonite
A gem variety of microcline feldspar, varying from bright verdigris green to a bluish green.

amazonites
plural of amazonite

ambonite
A mineral consisting of cordierite-bearing hornblende-biotite-andesite.

ambonites
plural of ambonite

ameghinite
A soft monoclinic mineral found in Argentina.

amesite
A triclinic-pedial mineral containing aluminum, hydrogen, magnesium, oxygen, and silicon.

amethysts
plural of amethyst

ametrine
A naturally occurring variety of quartz, with zones of purple and yellow or orange.

ametrines
plural of ametrine

aminoffite
A tetragonal-ditetragonal dipyramidal mineral containing beryllium, calcium, hydrogen, oxygen, and silicon.

ammolite
A rare and valuable opal-like gemstone, made of the fossilized shells of ammonites.

ammolites
plural of ammolite

ammonioalunite
A trigonal-hexagonal scalenohedral mineral containing aluminum, hydrogen, nitrogen, oxygen, and sulfur.

ammonioborite
A monoclinic-prismatic white mineral containing boron, hydrogen, nitrogen, and oxygen.

ammoniojarosite
A trigonal-ditrigonal pyramidal yellow mineral containing hydrogen, iron, nitrogen, oxygen, and sulfur.

ammonioleucite
A tetragonal-dipyramidal white mineral containing aluminum, hydrogen, nitrogen, oxygen, potassium, and silicon.

ammonioleucites
plural of ammonioleucite

amosite
A variety of grunerite asbestos, once used in insulation.

amosites
plural of amosite

ampangabeite
Synonym of samarskite.

ampelite
An earth abounding in pyrites, used by the Ancients Greeks as a pesticide on vines.
A carbonaceous alum schist.

ampelites
plural of ampelite

amphibolite
Any of a class of metamorphic rocks composed mainly of amphibole with some quartz etc.

amphibolites
plural of amphibolite

amphigene
Leucite.

ampholite
Any of a class of metamorphic rock composed mainly of amphibole and olivine.

amstallite
A monoclinic-prismatic colorless mineral containing aluminum, calcium, chlorine, hydrogen, oxygen, and silicon.

analcite
Analcime.

analcites
plural of analcite

anapaite
A triclinic-pinacoidal mineral containing calcium, hydrogen, iron, oxygen, and phosphorus.

andesite
Any of a class of fine-grained intermediate igneous rock, of volcanic origin, containing mostly plagioclase feldspar.

andesyte
Alternative spelling of andesite.

andesytes
plural of andesyte

andorite
A white mineral containing antimony, lead, silver, and sulfur.

andorites
plural of andorite

andradite
A nesosilicate mineral of the garnet group with chemical formula Ca₃Fe₂Si₃O₁₂.

andradites
plural of andradite

andremeyerite
A monoclinic-prismatic emerald green mineral containing barium, iron, magnesium, manganese, oxygen, and silicon.

andrewsite
A now-discredited mineral, reported in Cornwall and later shown to be a mixture of hentschelite and rockbridgeite, with minor chalcosiderite.

andrianovite
A very rare mineral of the eudialyte group.

anduoite
An orthorhombic-dipyramidal lead gray mineral containing arsenic, osmium, and ruthenium.

angelaite
A monoclinic-prismatic gray mineral containing bismuth, copper, lead, silver, and sulfur.

angelardite
Synonym of vivianite.

angelellite
A triclinic-pinacoidal black brown mineral containing arsenic, iron, and oxygen.

angrite
An achondrite consisting mostly of augite with some olivine and troilite

anilite
An orthorhombic-dipyramidal bluish gray mineral containing copper and sulfur.

anilites
plural of anilite

animikite
A silver telluride.

ankangite
A tetragonal-dipyramidal black mineral containing barium, chromium, oxygen, titanium, and vanadium.

ankinovichite
A monoclinic-prismatic mineral containing aluminum, copper, hydrogen, iron, nickel, oxygen, silicon, vanadium, and zinc.

anomalite
A dark brown variety of jeffersonite.

anorganology
The scientific study of inorganic entities: geology, mineralogy, etc.

anorthominasragrite
A triclinic-pinacoidal blue green mineral containing hydrogen, oxygen, sulfur, and vanadium.

anorthose
Synonym of anorthoclase.

anorthosite
A phaneritic, intrusive igneous rock characterized by a predominance of plagioclase feldspar.

anorthosites
plural of anorthosite

ansermetite
A monoclinic-prismatic carmine red mineral containing hydrogen, manganese, oxygen, and vanadium.

antarcticite
A trigonal-trapezohedral colorless mineral containing calcium, chlorine, hydrogen, and oxygen.

antecryst
A crystal formed from an earlier phase of the magmatic system, different from later forming crystals.