albite
A plagioclase feldspar, the first member of the Albite-Anorthite solid solution series.

albites
plural of albite

albitite
Any rock composed mostly of albite

albitites
plural of albitite

alboranite
A hypersthene-basalt without olivine.

alboranites
plural of alboranite

aliettite
A basic magnesium aluminosilicate.

allanite
Any of a group of silicate minerals that are a source of rare earth metals.

allanites
plural of allanite

allophane
An amorphous hydrous aluminium silicate clay mineral

alloriite
A rare silicate mineral of the cancrinite group, found in Italy, with the chemical formula Na₅K_(1.5)(Al₆Si₆O₂₄)(SO₄)(OH)_(0.5) * H₂O.

almagate
An antacid containing aluminium and magnesium.

almandin
Alternative form of almandine.

almandine
A type of garnet having a deep red color, inclining to purple, with the chemical formula Fe₃Al₂(SiO₄)₃.

almandines
plural of almandine

alterite
A rare yellow-green mineral with the chemical formula Zn2Fe3+4(SO4)4(C2O4)2(OH)4·17H2O.

aluminoceladonite
A bluish-green mineral that is a basic silicate of potassium, aluminium, magnesium and ferrous iron.

alurgite
A manganese mica that occurs in purplish colours.

alurgites
plural of alurgite

alvite
A silicate of hafnium, thorium and zirconium

alvites
plural of alvite

amazonstone
A bluish-green variety of microcline feldspar used as a gemstone. The best known occurrences are at Crystal Peak and Pike's Peak in Colorado.

amazonstones
plural of amazonstone

amicite
A monoclinic-sphenoidal zeolite mineral containing aluminum, hydrogen, oxygen, potassium, silicon, and sodium.

amphibole
Any of a large group of structurally similar hydrated double silicate minerals, containing various combinations of sodium, calcium, magnesium, iron, and aluminium.

amphiboles
plural of amphibole

anabohitsite
An olivine- and hornblende-bearing pyroxenite mineral.

analcime
A sodium aluminosilicate with a chemical formula NaAlSi₂O₆·H₂O, having a zeolite structure, found in alkaline basalts.

analcimes
plural of analcime

anandite
A usually monoclinic mineral of the mica group.

andalusite
An aluminium nesosilicate mineral, Al₂SiO₅, which can be cut into a gem and displays strong pleochroism, shifting between red, green, and yellow.

andalusites
plural of andalusite

androsite
A mineral of the epidote group.

andyrobertsite
A monoclinic mineral with vitreous lustre, having the chemical formula KCdCu₅[H₂AsO₄|(AsO₄)₄]·2H₂O.

annite
A phyllosilicate mineral related to biotite.

annites
plural of annite

anorthite
A variety of plagioclase feldspar, the calcium endmember of that series.

anorthites
plural of anorthite

anorthoclase
Any of a group of feldspars being mixed sodium and potassium aluminosilicates.

anorthoclases
plural of anorthoclase

anthophyllite
A dark brown amphibole mineral; a mixed silicate of iron and magnesium.

anthophyllites
plural of anthophyllite

antiperthite
A perthite having sodic feldspar as the dominant phase.

antiperthites
plural of antiperthite

arfvedsonite
A rare sodium amphibole mineral.

arfvedsonites
plural of arfvedsonite

argandite
A mineral with the chemical formula Mn₇(VO₄)₂(OH)₈.

armbrusterite
A mineral with the chemical formula K₅Na₃Mn³⁺Mn²⁺₁₄[Si₉O₂₂]₄(OH)₁₀·4H₂O.

asbesti
plural of asbestos
plural of asbestus

asbestinite
Actinolite.

asbestos
Any of several fibrous mineral forms of magnesium silicate, used for fireproofing, electrical insulation, building materials, brake linings, chemical filters, suits, fireman's gloves, etc.
Any of asbestos-like forms of several minerals, asbestiforms
The supposed material composing part of the body that is impervious to heat, or by extension other unpleasant sensations; especially hot or spicy food.

asbestoses
plural of asbestos
plural of asbestosis

asbestus
Dated form of asbestos.

aschaffite
A dioritic dike rock containing quartz and plagioclase, with biotite as the chief dark silicate.

astrophyllite
A rare, brown to golden-yellow hydrous potassium iron titanium silicate mineral, visually identical to kupletskite.

astrophyllites
plural of astrophyllite

atheneite
A rare metallic compound usually associated with palladium–gold deposits, chemically similar to graphite.

atlasovite
A tetragonal-ditetragonal dipyramidal dark brown mineral with the chemical formula K(BiO)Cu₆Fe³⁺(SO₄)₅O₃Cl.

attapulgite
A clay mineral containing silicates of aluminium and magnesium that is a constituent of fuller's earth and bentonite.

attapulgites
plural of attapulgite

aubertite
A blue mineral with the chemical formula CuAl(SO₄)₂Cl·14(H₂O).

augite
A variety of pyroxene, usually of a black or dark green color, occurring in igneous rocks, such as basalt.

augites
plural of augite

avanturine
Alternative form of aventurine.

avanturines
plural of avanturine

aventurin
Alternative form of aventurine.

aventurine
A kind of brownish glass containing gold-coloured spangles.
A variety of translucent quartz, spangled throughout with scales of yellow mica.

aventurines
plural of aventurine

aventurins
plural of aventurin

axinite
A borosilicate of aluminum, iron, and lime, commonly found in glassy, brown crystals with acute edges.

axinites
plural of axinite

babingtonite
A mineral occurring in triclinic crystals approaching pyroxene in angle, and of a greenish black color. It is a silicate of iron, manganese, and lime.

backite
A tellurate mineral with the chemical formula Pb₂Al(TeO₆)Cl.

baotite
A rare tetragonal mineral with a unique fourfold silicate ring.

baotites
plural of baotite

bararite
A natural form of ammonium fluorosilicate, with chemical formula (NH₄)₂SiF₆ and trigonal crystal structure.

barrerite
A white to pinkish tectosilicate zeolite mineral.

barsowite
anorthite

bazzite
A beryllium scandium cyclosilicate mineral taking the form of small blue hexagonal crystals.

bazzites
plural of bazzite

beidellite
A monoclinic-prismatic form of sodium aluminosilicate

beidellites
plural of beidellite

belite
An industrial mineral made up of primarily of dicalcium silicate.

bellite
A mixture of minerals, principally chromates and silicates of lead and arsenic

bellites
plural of bellite

belmontite
A discredited mineral species that was originally described as a lead silicate.

benitoite
A rare hard blue silicate mineral found in hydrothermally altered serpentinite.

benitoites
plural of benitoite

berborite
A colorless trigonal or hexagonal mineral, with chemical formula Be₂(BO₃)(OH,F)·(H₂O).

berborites
plural of berborite

bergmannite
Synonym of natrolite.

berryite
A blue-gray opaque mineral, with chemical formula Pb₃(Ag,Cu)₅Bi₇S₁₆.

berryites
plural of berryite

berthierite
A steel-gray opaque mineral, with chemical formula FeSb₂S₄.

berthierites
plural of berthierite

bertrandite
A basic beryllium sorosilicate that is an ore of beryllium.

beryl
A mineral of pegmatite deposits, often used as a gemstone (molecular formula Be₃Al₂Si₆O₁₈).
An example (a stone) of the mineral beryl.
A dull blueish green color.

beryls
plural of beryl

betafite
A radioactive mineral in the pyrochlore group, having chemical formula (Ca,U)₂(Ti,Nb,Ta)₂O₆(OH).

betafites
plural of betafite

bioactivator
A biological activator (typically for composting)

bioactivators
plural of bioactivator

biopyribole
Any of the rock-forming minerals pyroxene, amphibole, and mica.

biopyriboles
plural of biopyribole

birkremite
Synonym of charnockite.

birkremites
plural of birkremite

blairmorite
A very rare porphyritic volcanic rock characterized by dominant analcime phenocrysts in a matrix of analcime, sanidine and alkalic pyroxene with accessory titanite, melanite and nepheline.

bonaccordite
An orthorhombic-dipyramidal reddish-brown mineral of the ludwigite group, with chemical formula Ni₂FeBO₅.

borolanite
A pyroxene-melanite containing nepheline syenite

borolanites
plural of borolanite

braunite
A silicate mineral containing divalent and trivalent manganese and forming grey-black tetragonal crystals.

braunites
plural of braunite