dinite
An orthorhombic-disphenoidal mineral containing carbon and hydrogen.

diogenite
An achondritic stony meteorite originating from deep within the crust of the asteroid 4 Vesta

diomignite
A tetragonal-ditetragonal pyramidal colorless mineral containing boron, lithium, and oxygen.

diorite
A grey intrusive igneous rock composed mostly of plagioclase feldspar, biotite, hornblende and/or pyroxene.

diorites
plural of diorite

distaxy
An overgrowth in which both the original crystal and the crystal growing on it have different orientations.

disthene
Kyanite.

disthenes
plural of disthene

ditroite
An igneous rock composed of orthoclase, elaeolite, and sodalite.

ditroites
plural of ditroite

dittmarite
An orthorhombic-pyramidal colorless mineral containing hydrogen, magnesium, nitrogen, oxygen, and phosphorus.

divacancies
plural of divacancy

divacancy
A pair of vacancy defects in a crystal

dixenite
A trigonal-pyramidal mineral containing arsenic, copper, hydrogen, iron, manganese, oxygen, and silicon.

djalmaite
Synonym of uranmicrolite.

djerfisherite
An isometric-hexoctahedral mineral containing chlorine, copper, iron, nickel, potassium, sodium, and sulfur.

dodecant
Any of the twelve parts into which the space around the center of a hexagonal crystal is divided.

dodecants
plural of dodecant

dolerophanite
A monoclinic-prismatic mineral containing copper, oxygen, and sulfur.

dolime
Dolomitic lime, which is produced by heating (calcining) dolomitic limestone.

doline
A depression (basin, hollow) in karstic terrain/limestone.
Any sinkhole.

dolines
plural of doline

dolomicrite
A dolomite mudstone.

dolomitisation
Alternative spelling of dolomitization

dolomitization
The conversion of a limestone rock into dolomite by replacement of calcium by magnesium.

dolomitizations
plural of dolomitization

doloresite
A monoclinic-prismatic mineral containing hydrogen, oxygen, and vanadium.

domeykite
An isometric copper arsenide mineral, Cu₃As.

domeykites
plural of domeykite

domite
A greyish variety of trachyte.

domites
plural of domite.

donharrisite
A monoclinic-prismatic brown mineral containing mercury, nickel, and sulfur.

donpeacorite
An orthorhombic-dipyramidal yellow orange mineral containing magnesium, manganese, oxygen, and silicon.

dopplerite
A brownish-black hydrocarbon occurring in elastic or jelly-like masses, derived from the maceration of peat.

dopplerites
plural of dopplerite

dorallcharite
A trigonal-hexagonal scalenohedral golden yellow mineral containing hydrogen, iron, oxygen, potassium, sulfur, and thallium.

dorbank
durisol; hardpan soil

dorfmanite
An orthorhombic white mineral containing hydrogen, oxygen, phosphorus, and sodium.

dorrite
A triclinic mineral containing aluminum, calcium, iron, magnesium, oxygen, and silicon.

downeyite
A tetragonal-ditetragonal dipyramidal colorless mineral containing oxygen and selenium.

downlift
A lowering of the ground caused by geological forces.

downlifts
plural of downlift

doyleite
A triclinic-pinacoidal mineral containing aluminum, hydrogen, and oxygen.

dozyite
A monoclinic-domatic mineral containing aluminum, hydrogen, magnesium, oxygen, and silicon.

draconite
A mythical gemstone taken from the head of a live dragon and believed to have magical properties.

draconites
plural of draconite

dradge
Inferior ore, separated from the better ore by cobbing.

dravite
A trigonal-ditrigonal pyramidal mineral containing aluminum, boron, hydrogen, magnesium, oxygen, silicon, and sodium.

dresserite
An orthorhombic-dipyramidal white mineral containing aluminum, barium, carbon, hydrogen, and oxygen.

dropstone
An isolated fragment of rock found within a sedimentary rock (that had fallen, rather than being carried along).
An isolated rock that is geologically distinct from the surroundings, indicating that it was carried from a distant area and then dropped in place (by a melting glacier); an erratic.

dropstones
plural of dropstone

drugmanite
A monoclinic-prismatic mineral containing aluminum, hydrogen, iron, lead, oxygen, and phosphorus.

drusen
plural of druse

drusens
Alternative form of drusen (plural of druse)

druses
plural of druse

dubiofossil
Any geological object that has characteristics of a fossil but whose identity is uncertain.

dubiofossils
plural of dubiofossil

dudleyite
Synonym of vermiculite.

duftite
A particular kind of vitreous or dull, olive-green to grey-green orthorhombic mineral.

dugganite
A hexagonal-dihexagonal dipyramidal mineral containing arsenic, hydrogen, lead, oxygen, silicon, tellurium, vanadium, and zinc.

dukeite
A trigonal-ditrigonal pyramidal mineral containing bismuth, chromium, hydrogen, and oxygen.

dumontite
A monoclinic-prismatic mineral containing hydrogen, lead, oxygen, phosphorus, and uranium.

dundasite
An orthorhombic-dipyramidal mineral containing aluminum, carbon, hydrogen, lead, and oxygen.

duporthite
A rare asbestiform mineral, a mixture of talc and chlorite.

duporthites
plural of duporthite

duranusite
An orthorhombic red mineral containing arsenic and sulfur.

durapatite
A form of hydroxyapatite found in bone

duripan
A diagnostic soil horizon of the USDA soil taxonomy that is cemented by illuvial silica into a subsurface hardpan.

duripans
plural of duripan

dusmatovite
A hexagonal-dihexagonal dipyramidal mineral containing lithium, manganese, oxygen, potassium, silicon, sodium, yttrium, zinc, and zirconium.

dussertite
A trigonal-ditrigonal pyramidal mineral containing arsenic, barium, hydrogen, iron, and oxygen.

dutoitspanite
Former name of bultfonteinite

duttonite
A monoclinic-prismatic light brown mineral containing hydrogen, oxygen, and vanadium.

dwornikite
A monoclinic-prismatic white mineral containing hydrogen, iron, nickel, oxygen, and sulfur.

dypingite
A monoclinic white mineral containing carbon, hydrogen, magnesium, and oxygen.

dyscrasite
An orthorhombic-pyramidal mineral containing antimony and silver.

dysluite
A variety of the zinc spinel or gahnite.

dysodil
Alternative form of dysodile.

dysodile
A soft, finely laminated, greenish or yellowish-grey impure earthy or coaly bitumen, which emits a highly foetid odour when burning.

dysodiles
plural of dysodile

dysodils
plural of dysodil

dysodyle
Alternative form of dysodile.

dysodyles
plural of dysodyle

dysyntribite
Synonym of pinite.

dzhalindite
An isometric-diploidal yellow brown mineral containing hydrogen, indium, and oxygen.

dzharkenite
An isometric-diploidal black mineral containing iron and selenium.

dzhezkazganite
A rare rhenium-dominant mineral found in Kazakhstan.

eakerite
A monoclinic-prismatic mineral containing aluminum, calcium, hydrogen, oxygen, silicon, and tin.

eakleite
Synonym of xonotlite.

earlandite
A monoclinic mineral containing calcium, carbon, hydrogen, and oxygen.

earlshannonite
A monoclinic-prismatic mineral containing calcium, hydrogen, iron, magnesium, manganese, oxygen, and phosphorus.

earthwax
Ozocerite.

eastonite
A monoclinic-prismatic mineral containing aluminum, hydrogen, magnesium, oxygen, potassium, and silicon.

ecandrewsite
A trigonal-rhombohedral mineral containing iron, manganese, oxygen, titanium, and zinc.

ecdemite
A tetragonal mineral containing arsenic, chlorine, lead, and oxygen.

echinite
A fossilized echinoid.

echinites
plural of echinite

eckermannite
A monoclinic-prismatic blue green mineral containing aluminum, hydrogen, magnesium, oxygen, silicon, and sodium.

eclarite
An orthorhombic-dipyramidal mineral containing bismuth, copper, iron, lead, and sulfur.

eclogite
A coarse-grained metamorphic rock, a mixture of pyroxene, quartz, and feldspar with inclusions of red garnet.

eclogites
plural of eclogite

edenharterite
An orthorhombic-pyramidal mineral containing arsenic, lead, sulfur, and thallium.

edenite
A monoclinic-prismatic mineral containing aluminum, calcium, hydrogen, magnesium, oxygen, silicon, and sodium.