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.

Cubic Tetragonal Hexagonal Trigonal Orthorhombic Monoclinic Triclinic Amorphous
Almandine Anatase Algodonite Agate Adamite Aegirine Albite Amber
Analcite Apophyllite Apatite Achroite Aeschynite Aegirine-Augite Amazonite Glass
Andradite Carletonite Aquamarine Amethyst Alexandrite Actinolite Amblygonite Moldavite
Bixbyite Chiolite Benitoite Amethyst Quartz Andalusite Allanite Andesine Obsidian
Boleite Fergusonite Beryl Ametrine Anglesite Antigorite Anorthite Opal
Chromite Hyacinth Bixbite Ankerite Anhydrite Augelite Anorthoclase Petrified Wood
Cuprite Cassiterite Breithauptite Aventurine Aragonite Azurite Axinite Strass
Demantoid Chalcopyrite Cacoxenite Bloodstone Baryte Barytocalcite Bustamite
Diamond Ekanite Cancrinite Blue Quartz Bastite Bayldonite Bytownite
Fabulite Leucite Catapleiite Brucite Bismutotantalite Beryllonite Ceruleite
Fluorite Marialite Chlorapatite Buergerite Boracite Bowenite Chabazite
Gahnite Meionite Covellite Bytownite Bornite Brazilianite Ferro-Axinite
Gahnospinel Melinophane Emerald Calcite Bronzite Canasite Fowlerite
Galaxite Mellite Ettringite Carnelian Brookite Chalcocite Kurnakovite
GGG Phosgenite Fluorapatite Cat’s-Eye Quartz Celestine Charoite Kyanite
Gold Powellite Gold Beryl Chalcedony Cerussite Childrenite Labradorite
Garnet Pyrolusite Goshenite Chromdravite Chambersite Chondrodite Leucophanite
Grossularite Rutile Greenockite Chrysoprase Childrenite Chromian Diopside Magnesio-Axinite
Hackmanite Sarcolite Heliodor Citrine Chrysoberyl Chrysocolla Manganaxinite
Hauynite Scapolite Hydroxylapatite Cinnabar Cobaltite Clinochlore Microline
Helvite Scheelite Jeremejevite Corundum Cordierite Clinochrysotile Montebrasite
Hercynite Sellaite Lizardite Davidite Danburite Clinoenstatite Nambulite
Hessonite Stolzite Manganapatite Dendritic Agate Descloizite Clinohumite Natromontebrasite
Katoite Synth. Rutile Milarite Dioptase Diaspore Clinozoisite Oligoclase
Langbeinite Tugtupite Mimetite Dolomite Dumortierite Colemanite Pectolite
Lapis Lazuli Vesuvianite Moissanite Dravite Enstatite Creedite Peristerite
Lazurite Wardite Morganite Elbaite Eosphorite Crocoite Pyrophyllite
Leucogranite Wulfenite Nepheline Eudialyte Euchroite Cryolite Pyroxmangite
Magnesiochromite Zircon Nickeline Gaspeite Euxenite Datolite Rhodonite
Magnetite Precious Beryl Hawk’s-Eye Ferrosilite Dickinsonite Sérandite
Melanite Painite Hematite Forsterite Diopside Serendibite
Microlite Simpsonite Ilmenite Goethite Durangite Sunstone
Pentlandite Sogdianite Indicolite Grandidierite Epidote Talc
Periclase Sturmanite Jasper Hambergite Euclase Tinzenite
Picotite Sugilite Liddicoatite Hemimorphite Friedelite Turquoise
Pleonaste Taafeite Linobate Holtite Fuchsite Ulexite
Pollucite Thaumasite Lizardite Humite Gadolinite Weloganite
Pyrite Vanadinite Magnesite Hypersthene Gaylussite Wollastonite
Pyrope Wurtzite Melonite Kornerupine Gypsum Xonotlite
Rhodozite Zincite Millerite Lawsonite Hancockite
Rhodolite Moss Agate Libethenite Hedenbergite
Schorlomite Parisite Lithiophilite Herderite
Senarmontite Phenakite Manganotantalite Hiddenite
Silver Povondraite Marcasite Hodgkinsonite
Sodalite Prase Mordenite Hornblende
Spessartine Prasiolite Natrolite Howlite
Sphalerite Proustite Norbergite Hübnerite
Spinel Pyrargyrite Pearl Huréaulite
Synthetic Spinel Quartz Peridot Hurlbutite
Thorianite Rhodochrosite Prehnite Hyalophane
Topazolite Rock Crystal Purpurite Hydroxylherderite
Tsavorite Rose Quartz Samarskite Inderite
Uvarovite Rubellite Scorodite Jadeite
Villiaumite Ruby Sekaninaite Kämmererite
YAG Sapphire Sepiolite Kunzite
Zirconia Sardonyx Shattuckite Lazulite
Zunyite Schlossmacherite Shomiokite Legrandite
Schorl Shortite Lepidolite
Siberite Sillimanite Linarite
Siderite Sinhalite Ludlamite
Smithsonite Stibiotantalite Malachite
Smoky Quartz Strontianite Mesolite
Stichtite Sulfur Monazite
Tiger’s-Eye Tanzanite Moonstone
Tsilaisite Tantalite Muscovite
Tourmaline Tephroite Nephrite
Uvite Thomsonite Neptunite
Verdelite Thulite Orthoclase
Willemite Topaz Palygorskite
Triphylite Papagoite
Variscite Pargasite
Wavellite Petalite
Witherite Phosphophyllite
Yttrotantalite Piemontite
Zektzerite Prosopite
Zoisite Psilomelane
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.