edgarbaileyite
A monoclinic-prismatic mineral containing mercury, oxygen, and silicon.

edgarite
A hexagonal-trapezohedral similar to molybdenite mineral containing iron, niobium, and sulfur.

edoylerite
A monoclinic-prismatic mineral containing chromium, mercury, oxygen, and sulfur.

edscottite
An iron carbide mineral with the formula Fe₅C₂.

effenbergerite
A tetragonal-ditetragonal dipyramidal blue mineral containing barium, copper, oxygen, and silicon.

efremovite
An isometric-tetartoidal mineral containing hydrogen, magnesium, nitrogen, oxygen, and sulfur.

eggletonite
A monoclinic golden brown mineral containing aluminum, hydrogen, manganese, oxygen, silicon, and sodium.

eggonite
Synonym of kolbeckite.

eglestonite
An isometric-hexoctahedral mineral containing chlorine, hydrogen, mercury, and oxygen.

ehlite
A variety of pseudomalachite.

ehrleite
A triclinic-pinacoidal mineral containing beryllium, calcium, hydrogen, oxygen, phosphorus, and zinc.

eichbergite
A mixture of jaskólskiite and bismuth-bearing meneghinite.

eifelite
A hexagonal-dihexagonal dipyramidal mineral containing magnesium, oxygen, potassium, silicon, and sodium.

eigensymmetries
plural of eigensymmetry

eigensymmetry
The inherent symmetry of a crystal irrespective of its orientation and location in space

eisenbrucite
An obsolete name for a mixture of brucite, chrysotile, hydromagnesite and pyroaurite.

eitelite
A trigonal-rhombohedral mineral containing carbon, magnesium, oxygen, and sodium.

ekanite
An uncommon mineral, one of very few gemstones that are naturally radioactive. (It contains thorium.)

ekanites
plural of ekanite

ekaterinite
A hexagonal-pyramidal mineral containing boron, calcium, chlorine, hydrogen, and oxygen.

ekatite
A hexagonal-dihexagonal pyramidal brownish black mineral containing arsenic, hydrogen, iron, oxygen, silicon, and zinc.

ekebergite
Wernerite, a scapolite mineral.

eklogite
Alternative form of eclogite.

eklogites
plural of eklogite

elaeolite
A variety of nepheline, usually massive and of a greasy lustre and grey to reddish colour.

elaeolites
plural of elaeolite

elaolite
Archaic form of elaeolite.

elasmodine
A mineralised form of collagen that is the main component of elasmoid fish-scales

elaterite
The mineral wurtzilite.

eldfellite
The mineral NaFe(SO₄)₂ that may be used as a cathode in sodium-ion batteries

electrocortin
aldosterone

eleolite
Alternative form of elaeolite.

eleolites
plural of eleolite

elkerite
A subgroup of pyrobitumens rich in oxygen and partly soluble in alkali, resembling an earthy brown coal and probably representing a product of intense weathering of bitumens.

elkerites
plural of elkerite

ellenbergerite
A hexagonal-pyramidal mineral containing aluminum, hydrogen, magnesium, oxygen, silicon, and titanium.

ellestadite
A mineral found in metamorphosed limestone.

ellestadites
plural of ellestadite

ellisite
A trigonal-ditrigonal pyramidal dark gray mineral containing arsenic, sulfur, and thallium.

ellsworthite
Synonym of uranpyrochlore.

elpasolite
An isometric-hexoctahedral colorless mineral containing aluminum, fluorine, potassium, and sodium.

elpasolites
plural of elpasolite

elpidite
An orthorhombic-pyramidal mineral containing hydrogen, oxygen, silicon, sodium, and zirconium.

elpidites
plural of elpidite

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

embreyite
A monoclinic-prismatic orange mineral containing chromium, hydrogen, lead, oxygen, and phosphorus.

embrithite
Synonym of boulangerite.

emeleusite
An orthorhombic-dipyramidal mineral containing iron, lithium, oxygen, silicon, and sodium.

emilite
An orthorhombic-pyramidal tin white mineral containing bismuth, copper, lead, and sulfur.

emmonsite
A triclinic-pinacoidal mineral containing hydrogen, iron, oxygen, and tellurium.

emplectite
A sulfosalt mineral.

empressite
A rare hexagonal mineral form of silver telluride.

empressites
plural of empressite

enantiotrope
A crystal that can undergo a reversible transformation when heated above, or cooled below, a transition-point temperature.

enantiotropes
plural of enantiotrope

enantiotropism
The reversible transformation of a crystal between different forms when heated above, or cooled below, a transition-point temperature.

enargite
A steel gray, blackish gray, to violet black copper arsenic sulfosalt mineral with a metallic luster.

enargites
plural of enargite

enciclopedia
Misspelling of encyclopedia.

endellionite
The mineral bournonite.

endellite
A monoclinic-domatic mineral containing aluminum, hydrogen, oxygen, and silicon. Discredited as the name of the mineral in 2006.

endellites
plural of endellite

enderbite
An igneous rock of the charnockite series.

enderbites
plural of enderbite

endichnion
A trace fossil preserved entirely within a bed.

endlichite
Vanadinite with significant arsenic impurity.

endmember
A member at one end of a range or series made up of similar members.
A mineral that occurs at one end in a range of solid solutions.

endmembers
plural of endmember.

endomorph
A mineral, especially a crystal, enclosed within another
A person of the endomorphic physical type, characterised by big bones, round face, large trunk and thighs and a naturally high degree of body fat, especially around the midsection.
A person having a theoretical body type with slow metabolism in which weight is gained easily, but fat levels are hard to reduce. Endomorphic bodybuilders tend to be the most massive.

endomorphism
The assimilation of surrounding rock by an intrusive igneous rock.
A homomorphism that maps a system to itself.

endomorphisms
plural of endomorphism

endomorphs
plural of endomorph

endoskarn
A skarn of igneous origin that forms within the granite mass itself.

endoskarns
plural of endoskarn

englishite
A monoclinic-sphenoidal mineral containing aluminum, calcium, hydrogen, oxygen, phosphorus, potassium, and sodium.

enhydrite
A mineral with cavities containing water.

enhydrites
plural of enhydrite

enhydros
A geode of chalcedony containing trapped water.

enterolite
Synonym of enterolith (“intestinal concretion”).

enterolites
plural of enterolite

enterolith
A mineral concretion in the intestinal tract.
A bezoar.

enteroliths
plural of enterolith

eolith
Crudely chopped flints, believed to be naturally produced by geological processes such as glaciation.

eoliths
plural of eolith

eosphorite
An orthorhombic-dipyramidal mineral containing aluminum, hydrogen, manganese, oxygen, and phosphorus.

eosphorites
plural of eosphorite

ephesite
A monoclinic-prismatic mineral containing aluminum, hydrogen, lithium, oxygen, silicon, and sodium.

epiboulangerite
Synonym of boulangerite.

epididymite
An orthorhombic-dipyramidal mineral containing beryllium, hydrogen, oxygen, silicon, and sodium.

epidiorite
A greenish metamorphic rock composed of plagioclase and hornblende.

epidiorites
plural of epidiorite

epinatrolite
Synonym of natrolite.

epinatrolith
Alternative form of epinatrolite.

epistilbite
A triclinic-pedial mineral containing aluminum, calcium, hydrogen, oxygen, and silicon.

epistolite
A triclinic-pinacoidal mineral containing calcium, fluorine, hydrogen, iron, manganese, niobium, oxygen, silicon, sodium, and titanium.

episyenite
A rock originally rich in silicon dioxide from which quartz has been severely depleted.

epitaxies
plural of epitaxy

epitaxy
An overgrowth in which the overlying crystal is either induced into the same orientation, or otherwise grows under the influence of the underlying crystal into the same orientation.
A type of crystal growth or material deposition in which new crystalline layers are formed with one or more well-defined orientations with respect to the crystalline seed layer.

ercitite
An orthorhombic-dipyramidal mineral containing calcium, hydrogen, iron, manganese, oxygen, phosphorus, and sodium.

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