Table of Gems Ordered by Crystal System


These butterscotch-colored wulfenite gemstones show their tetragonal crystal structure. Some gems in the tetragonal crystal system form as rectangular prisms with square terminations, like these. Others can take the shape of rectangular prisms with pyramidal terminations. Some form as dipyramids, two 4-sided pyramids joined at their bases. “Wulfenite” on a limonite matrix, San Juan Poniente Shaft, Ojuela Mine, Mapimi, Durango, Mexico. © Rob Lavinsky, www.iRocks.com. Used with permission.

The following table contains a selection of minerals gemologists may encounter as jewelry stones or gem specimens. The gems are sorted by their crystal system: cubic (isometric), tetragonal, hexagonal, trigonal, orthorhombic, monoclinic, and triclinic. “Amorphous” gems have no crystal structure.

CubicTetragonalHexagonalTrigonalOrthorhombicMonoclinicTriclinicAmorphous
AlmandineAnataseAlgodoniteAgateAdamiteAegirineAlbiteAmber
AnalciteApophylliteApatiteAchroiteAeschyniteAegirine-AugiteAmazoniteGlass
AndraditeCarletoniteAquamarineAmethystAlexandriteActinoliteAmblygoniteMoldavite
BixbyiteChioliteBenitoiteAmethyst QuartzAndalusiteAllaniteAndesineObsidian
BoleiteFergusoniteBerylAmetrineAnglesiteAntigoriteAnorthiteOpal
ChromiteHyacinthBixbiteAnkeriteAnhydriteAugeliteAnorthoclasePetrified Wood
CupriteCassiteriteBreithauptiteAventurineAragoniteAzuriteAxiniteStrass
DemantoidChalcopyriteCacoxeniteBloodstoneBaryteBarytocalciteBustamite
DiamondEkaniteCancriniteBlue QuartzBastiteBayldoniteBytownite
FabuliteLeuciteCatapleiiteBruciteBismutotantaliteBerylloniteCeruleite
FluoriteMarialiteChlorapatiteBuergeriteBoraciteBoweniteChabazite
GahniteMeioniteCovelliteBytowniteBorniteBrazilianiteFerro-Axinite
GahnospinelMelinophaneEmeraldCalciteBronziteCanasiteFowlerite
GalaxiteMelliteEttringiteCarnelianBrookiteChalcociteKurnakovite
GGGPhosgeniteFluorapatiteCat’s-Eye QuartzCelestineCharoiteKyanite
GoldPowelliteGold BerylChalcedonyCerussiteChildreniteLabradorite
GarnetPyrolusiteGosheniteChromdraviteChambersiteChondroditeLeucophanite
GrossulariteRutileGreenockiteChrysopraseChildreniteChromian DiopsideMagnesio-Axinite
HackmaniteSarcoliteHeliodorCitrineChrysoberylChrysocollaManganaxinite
HauyniteScapoliteHydroxylapatiteCinnabarCobaltiteClinochloreMicroline
HelviteScheeliteJeremejeviteCorundumCordieriteClinochrysotileMontebrasite
HercyniteSellaiteLizarditeDaviditeDanburiteClinoenstatiteNambulite
HessoniteStolziteManganapatiteDendritic AgateDescloiziteClinohumiteNatromontebrasite
KatoiteSynth. RutileMilariteDioptaseDiasporeClinozoisiteOligoclase
LangbeiniteTugtupiteMimetiteDolomiteDumortieriteColemanitePectolite
Lapis LazuliVesuvianiteMoissaniteDraviteEnstatiteCreeditePeristerite
LazuriteWarditeMorganiteElbaiteEosphoriteCrocoitePyrophyllite
LeucograniteWulfeniteNephelineEudialyteEuchroiteCryolitePyroxmangite
MagnesiochromiteZirconNickelineGaspeiteEuxeniteDatoliteRhodonite
MagnetitePrecious BerylHawk’s-EyeFerrosiliteDickinsoniteSérandite
MelanitePainiteHematiteForsteriteDiopsideSerendibite
MicroliteSimpsoniteIlmeniteGoethiteDurangiteSunstone
PentlanditeSogdianiteIndicoliteGrandidieriteEpidoteTalc
PericlaseSturmaniteJasperHambergiteEuclaseTinzenite
PicotiteSugiliteLiddicoatiteHemimorphiteFriedeliteTurquoise
PleonasteTaafeiteLinobateHoltiteFuchsiteUlexite
PolluciteThaumasiteLizarditeHumiteGadoliniteWeloganite
PyriteVanadiniteMagnesiteHyperstheneGaylussiteWollastonite
PyropeWurtziteMeloniteKornerupineGypsumXonotlite
RhodoziteZinciteMilleriteLawsoniteHancockite
RhodoliteMoss AgateLibetheniteHedenbergite
SchorlomiteParisiteLithiophiliteHerderite
SenarmontitePhenakiteManganotantaliteHiddenite
SilverPovondraiteMarcasiteHodgkinsonite
SodalitePraseMordeniteHornblende
SpessartinePrasioliteNatroliteHowlite
SphaleriteProustiteNorbergiteHübnerite
SpinelPyrargyritePearlHuréaulite
Synthetic SpinelQuartzPeridotHurlbutite
ThorianiteRhodochrositePrehniteHyalophane
TopazoliteRock CrystalPurpuriteHydroxylherderite
TsavoriteRose QuartzSamarskiteInderite
UvaroviteRubelliteScoroditeJadeite
VilliaumiteRubySekaninaiteKämmererite
YAGSapphireSepioliteKunzite
ZirconiaSardonyxShattuckiteLazulite
ZunyiteSchlossmacheriteShomiokiteLegrandite
SchorlShortiteLepidolite
SiberiteSillimaniteLinarite
SideriteSinhaliteLudlamite
SmithsoniteStibiotantaliteMalachite
Smoky QuartzStrontianiteMesolite
StichtiteSulfurMonazite
Tiger’s-EyeTanzaniteMoonstone
TsilaisiteTantaliteMuscovite
TourmalineTephroiteNephrite
UviteThomsoniteNeptunite
VerdeliteThuliteOrthoclase
WillemiteTopazPalygorskite
TriphylitePapagoite
VariscitePargasite
WavellitePetalite
WitheritePhosphophyllite
YttrotantalitePiemontite
ZektzeriteProsopite
ZoisitePsilomelane
Pumpellyite
Pyrophyllite
Realgar
Richterite
Rinkite
Sanidine
Sapphirine
Scolecite
Scorzalite
Serpentine
Smaragdite
Spodumene
Spurrite
Staurolite
Talc
Tawmawite
Titanite
Tremolite
Väyrynenite
Violane
Vivianite
Vlasovite
Whewellite
Williamsite
Wolframite
Wollastonite
Xonotlite
Yugawaralite

Additional Crystal System Information

For more detailed information, consult the individual gem listings as well as these International Gem Society articles:

What are Crystal Systems and Mineral Habits?

Descriptive Crystallography for Gemologists

Source

Gemstones of the World, Revised Edition. Walter Schumann. New York, NY: Sterling, 2000. 272 pp.