Quartz

Big Photo

Chrysoprase
India
6.86 carats
© gemselect.com

Quartz (named after a Slavic word for "hard") is the most common mineral found on the surface of the Earth. A significant component of many igneous, metamorphic and sedimentary rocks, this natural form of silicon dioxide is found in an impressive range of varieties and colours.

Quartz Gemstones by Colour

This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Quartz Gemstones by Size

This table shows distribution of Quartz gemstone sizes that are listed on this site. This can give a good indication as to the general availability of this gemstone in different sizes.
Contributed photos
Lightest:0.17 cts
Heaviest:990 cts
Average:24.82 cts
Total photos:976
Do you have a larger Quartz? Why not upload a photo?
0.17ct to 99.15ct99.15ct to 198.14ct198.14ct to 297.12ct297.12ct to 396.10ct396.10ct to 495.09ct495.09ct to 594.07ct594.07ct to 693.05ct693.05ct to 792.03ct792.03ct to 891.02ct891.02ct to 990.00ct
General Information
Varieties/Types:
Amethyst - A purple variety of Quartz.
Ametrine - A mixture of Amethyst and Citrine in the same crystal.
Aqua Aura - Clear quartz artificially coated with thin layer of metal to turn it iridescent.
Chalcedony - A cryptocrystalline variety of Quartz.
Agate - A banded variety of Chalcedony.
Iris Agate - An iridescent variety of Agate.
Onyx - A monochromatic Agate with black and white banding.
Sardonyx - A monochromatic Agate with red/brown and either black or white banding.
Binghamite - Chatoyant Chalcedony with fibres of hematite/goethite.
Bloodstone - A dark green/greenish-blue Chalcedony with small red blood-like spots.
Carnelian - A red to orange variety of Chalcedony.
Chrome-Chalcedony - Emerald green Chalcedony, colored by chromium.
Chrysoprase - A green Chalcedony coloured by inclusions of Ni minerals.
Dendritic Agate - A chalcedony containing contrasting branching, or dendritic, mineral inclusions.
Moss Agate - A translucent chalcedony containing green strands of chlorite.
Fire Agate - A variety of Agate containing iridescent spheroids of limonite.
Jasper - Jasper is a dense, opaque, microcrystalline variety of Chalcedony.
Dallasite - A variety of Jasper from Vancouver Island, British Columbia, Canada.
Orbicular Jasper - Jasper containing numerous spherical inclusions.
Petrified Wood - A decorative type of fossil wood where the original organic material has been replaced - usually by chalcedony, agate, opal, etc.
Pietersite - Chalcedony with embedded fibers of amphibole minerals, causing chatoyancy.
Sard - A brown to brownish-red translucent variety of Chalcedony.
Citrine - A yellow to yellow-orange or yellow-green variety of Quartz.
Iris Quartz - A quartz showing rainbow colours.
Merlinite - Drusy quartz over psilomelane.
Mystic Quartz - Clear cut quartz coated with thin layer of titanium on pavilion.
Prase - Prase is a leek-green variety of Quartz.
Prasiolite - A green variety of Quartz.
Rock Crystal - A transparent colourless variety of Quartz.
Rose Quartz - Pink variety of Quartz.
Rutilated Quartz - A clear Quartz shot through with golden needles of rutile.
Smoky Quartz - Smoky-grey, brown to black variety of Quartz.
Morion - Sometimes synonymous with Smoky quartz, but often reserved for nearly black Smoky quartz.
Tiger's Eye - Chatoyant yellowish-brown variety of Quartz.
Chemical Formula
SiO
 
2
Michael O’Donoghue, Gems, Sixth Edition (2006)
More from other references
Photos of natural/un-cut material from mindat.org
Synthetic Quartz
All colors, mostly amethyst, citrine, ametrine: colors are usually intense. Standard tests limited: needle-like 2 phase inclusions, dust-like "breadcrumb" planes, whitish wisps. In synthetic quartz, if present, twinning may create a distinctive lfame-like pattern or may be seen as very thin parallel lines showing interference colors with diagnostic striated appearance. Synthetic blue: Chelsea - red. - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 7
Synthetic quartz: mostly untwinned, rarely triangular sectors with interference colours, "bread crumbs", residues of the seed plate - Gemmological Tables, Ulrich Henn and Claudio C. Milisenda, 2004, p 9
Physical Properties of Quartz
Mohs Hardness7 to 0
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
Specific Gravity2.65
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
Cleavage QualityNone
Arthur Thomas, Gemstones (2009)
FractureConchoidal
Michael O’Donoghue, Gems, Sixth Edition (2006)
More from other references
Optical Properties of Quartz
Refractive Index1.544 to 1.553
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
Optical CharacterUniaxial/+
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
Birefringence0.009
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
PleochroismWeakly dichroic
Arthur Thomas, Gemstones (2009)
Dispersion0.013
Michael O’Donoghue, Gems, Sixth Edition (2006)
More from other references
Colour
Colour (General)Brown, black, colourless, green, pink, violet, white, yellow, orange, purple
Arthur Thomas, Gemstones (2009)
Causes of ColourViolet to purple (amethyst), O2+Fe4+ charge transfer, due to irradiation. Blue, inclusions of blue dumortierite or tourmaline. Green ("greened amethyst" or prasiolite, Fe2+. Green (aventurine quartz), chromian mica (fuchsite) inclusions. Greenish yellow, color center. Yellow to orange (citrine), O2-Fe3+ charge transfer, various Al3+ related color centers. Smokey (smoky quartz), color center related to the Al3+ impunity. Pink (rose quartz), charge transfer between a substitutional Ti4+ and an interstitial Ti3+ unstable color center O- ion bridging between substitutional aluminum and substitutional phosphorus atom; dumortierite inclusions. White (milky quartz), scattering of light by inclusions larger than the visible wavelengths.
W. William Hanneman, Pragmatic Spectroscopy For Gemologists (2011)
TransparencyTransparent,Translucent,Opaque
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
LustreVitreous
Arthur Thomas, Gemstones (2009)
Fluorescence & other light emissions
Fluorescence (General)Shows no fluorescence
Michael O’Donoghue, Gems, Sixth Edition (2006)
Crystallography of Quartz
Crystal SystemTrigonal
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
HabitPrismatic
Michael O’Donoghue, Gems, Sixth Edition (2006)
Geological Environment
Where found:Quartz occurs in epithermal veins; it is a characteristic mineral of granites and granite pegmatites and is found in sandstones and quartzites. It occurs in hydrothermal metal deposits and in carbonate rocks where it is common.
Michael O’Donoghue, Gems, Sixth Edition (2006)
Spectrographic Data
Calculated Spectra:
Click spectra for more information
Chrysoprase - Locality: Unknown
Mystic Quartz - Locality: Unknown
Inclusions in Quartz
Inclusions: goethite, hematite, etc. liquid- and two-phase inclusions - Gemmological Tables, Ulrich Henn and Claudio C. Milisenda, 2004, p 9
Further Information
Mineral information:Quartz information at mindat.org
Significant Gem Localities
Afghanistan
 
  • Ghazni Province (Gazni Province)
    • Qarabagh District
      • Zarkashan Mt (Zarkishen; Zerkishen)
[var: Amethyst] Laurs (2002)
Bolivia
 
  • Santa Cruz Department
    • Chiquitos Province
Collyer et al. (1994)
    • Sandoval Province
      • La Gaiba District
[var: Amethyst] Laurs (2001, 2010)
[var: Amethyst] Laurs (2001, 2010)
[var: Amethyst] Laurs (2001, 2010)
Brazil
 
  • Bahia
    • Lagoa Real U province
      • Caetité
[var: Amethyst] Couto (2000)
  • Minas Gerais
    • Conselheiro Pena
      • Ferruginha
[var: Citrine] Macri et al. (2006)
Macri et al. (2006)
    • Coronel Murta
Macri et al. (2006)
    • Galiléia
      • Sapucaia do Norte
[var: Rose Quartz] Wilson (1999)
  • Paraíba
    • Borborema mineral province
      • Junco do Seridó
[var: Citrine] Kievlenko E.Ya., Geology of gems, 2003, p. 113
  • Rio Grande do Sul
    • Alto Uruguai region
[var: Amethyst] Priester (1999)
[var: Amethyst] Balzer (1999)
[var: Amethyst] Rocks & Min.:5:131.
[var: Amethyst] Rocks & Min.: 5:131.
    • Passo Fundo
[var: Amethyst] Rocks & Min.:5:131.
[var: Amethyst]
  • Rondônia
    • Porto Velho
[var: Amethyst] R. Batista and D. Epstein (2000)
Cambodia
 
[var: Amethyst] Ngu and Ngoc (1986)
Ngu and Ngoc (1986)
Canada
 
  • Ontario
[var: Amethyst] Garland (2004)
      • McTavish Township
[var: Amethyst] Sinkankas (1997)
[var: Amethyst] Sinkankas (1997)
Czech Republic
 
  • Bohemia (Böhmen; Boehmen)
    • Hradec Králové Region
      • Jičín (Jitschin; Gitschin)
[Chalcedony var: Jasper] No reference listed
India
 
[var: Amethyst] S. Fernandes (1999)
[var: Iris Quartz]
Kenya
 
  • Eastern Province
    • Kitui District
[var: Amethyst] Henn and Milisenda (2001)
Madagascar
 
  • Antananarivo Province
    • Analamanga Region
      • Anjozorobe District
[var: Rose Quartz] Madagascar - extraLapis English No.1, 2001, p. 44
      • Ankazobe District
[var: Amethyst] Madagascar, extraLapis English No.1, 2001, p. 44
    • Vakinankaratra Region
      • Betafo District
        • Mahaiza Commune
[var: Rose Quartz] E.Ya. Kievlenko, Geology of gems, 2003, p. 112
      • Mandoto District
        • Anjoman-dRamartinina Commune
[var: Citrine] Danet (2009)
Madagascar, extraLapis English No.1, 2001, p. 50
  • Antsiranana Province
    • Diana Region (Northern Region)
[var: Amethyst] Pezzotta (1999)
    • Sava Region (Northeastern Region)
      • Andapa District
[var: Smoky Quartz] Danet (2009)
[var: Smoky Quartz]
      • Vohémar District
[var: Rose Quartz] Madagascar - extraLapis English No.1, 2001, p. 41
  • Fianarantsoa Province
    • Amoron'i Mania Region
      • Ambositra District
[var: Rose Quartz] Pezzotta (1999)
    • Atsimo-Atsinanana Region
[var: Citrine] Pezzotta (2001)
    • Horombe Region
      • Ihosy District
        • Ilakaka Commune
[var: Amethyst] Madagascar - extraLapis English No.1, p. 92
  • Mahajanga Province (Majunga)
    • Betsiboka Region
      • Tsaratanàna District
        • Andriamena Commune
[var: Smoky Quartz] Madagascar, extraLapis English No.1, 2001, p. 43
    • Sofia Region
      • Analalava District
        • Ambolobozo
[Chalcedony var: Jasper] mindat.org
  • Toamasina Province (Tamatave)
    • Alaotra-Mangoro Region
      • Andilamena District
[var: Amethyst] Aurisicchio et al. (1999)
[var: Smoky Quartz] Madagascar, extraLapis English No.1, 2001, p. 46
Madagascar, extraLapis English No.1, 2001, p. 46
Mexico
 
  • Guerrero
    • Mun. de Zumpango del Rio
[var: Amethyst] Ontiveros et al. (2004)
[var: Amethyst] Ontiveros et al. (2004)
Morocco
 
  • Drâa-Tafilalet Region
    • Midelt Province
      • Upper Moulouya lead district
[Chalcedony var: Jasper] mindat.org
Mozambique
 
  • Zambezia Province
    • Alto Ligonha District
Bettencourt-Dias and Wilson (2000)
[var: Rose Quartz] Bettencourt-Dias and Wilson (2000)
Myanmar
 
  • Mandalay Region (Mandalay Division)
    • Pyin-Oo-Lwin District
      • Mogok Township
        • Bernardmyo
[var: Citrine] Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
          • Pyaung Gaung
[Chalcedony var: Chrysoprase] Ted Themelis (2008) Gems & mines of Mogok
[Chalcedony var: Chrysoprase] Ted Themelis (2008) Gems & mines of Mogok
        • Chaung-gyi
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
        • Kin (Guard Post)
Ted Themelis (2008) Gems & mines of Mogok
        • Kyatpyin North
[var: Smoky Quartz] Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
        • Kyauk-Pyat-That
[var: Amethyst] Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
[var: Rock Crystal] Kammerling et al. (1994)
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
          • Yadanar-kaday-kadar
Ted Themelis (2008) Gems & mines of Mogok
        • Marble Ark
Ted Themelis (2008) Gems & mines of Mogok
        • Mogok Valley
          • Dattaw-taung (Dattaw hill)
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
[var: Amethyst] Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
        • On-dan
Ted Themelis (2008) Gems & mines of Mogok
        • Pein-Pyit (Painpyit; Pyan Pyit)
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
    • Yamethin District
Ted Themelis (2008) Gems & mines of Mogok
  • Sagaing Region (Sagaing Division)
    • Katha District
      • Wuntho Township
[var: Amethyst] Ted Themelis (2008) Gems & mines of Mogok
Namibia
 
  • Erongo Region
    • Brandberg Area
[var: Amethyst]
[var: Amethyst] Michelou (2006)
Netherlands
 
  • Gelderland
[Chalcedony var: Jasper] mindat.org
Nigeria
 
  • Taraba State
[var: Amethyst] Laurs and Koivula (2003)
Peru
 
  • Ancash Department
[var: Amethyst]
    • Pallasca Province
      • Pampas District
  • Arequipa Department
    • Caraveli Province
[Chalcedony var: Chrysocolla Chalcedony]
  • Huancavelica Department
    • Castrovirreyna Province
    • Huancavelica Province
      • Ascencion District
        • Yauricocha Parish
[Chalcedony var: Agate]
  • Huánuco Department
[Chalcedony var: Jasper]
  • Ica Department
    • Pisco Umay
  • Junín Department
    • Yauli Province
      • Morococha District
  • La Libertad Department
    • Sanchez Carrion Province
      • Huamachuco
        • Mundo Nuevo
  • Lima Department
    • Cañete Province
[Chalcedony var: Jasper]
  • Pasco department
    • Pasco province
      • Huayllay district
        • Huaron mining district
  • Puno Department
[Chalcedony var: Jasper]
Poland
 
  • Lower Silesia (Dolnośląskie)
    • Ząbkowice District
[Chalcedony var: Chrysoprase] Gemstones of the world, Walter Schumann (2001)
Portugal
 
  • Beja District
    • Mértola
      • Alcaria Ruiva
[Chalcedony var: Jasper] mindat.org
Russia
 
  • Eastern-Siberian Region
    • Prebaikalia (Pribaikal'e)
      • Irkutskaya Oblast'
        • Zheleznogorsk (Korshunikha)
Smith and Smith (1995)
    • Sakha Republic (Saha Republic; Yakutia)
[var: Amethyst] V. Bukanov (1999)
  • Far-Eastern Region
    • Magadanskaya Oblast'
[var: Amethyst] P. Lyckberg (2009)
  • Northern Region
    • Murmanskaja Oblast'
      • Kola Peninsula
        • Tersky Bereg
[var: Amethyst] V. Bukanov (1999)
  • Urals Region
    • Southern Urals
      • Chelyabinsk Oblast'
[var: Amethyst]
      • Orenburgskaya Oblast'
        • Orsk
[Chalcedony var: Jasper] Занимательная минералогия, Ферсман А., 1953, стр. 50
South Korea
 
  • Gyeongsangnam-do (Kyongsang-namdo)
[var: Amethyst] Yang et al. (2001)
Sri Lanka
 
  • Sabaragamuwa Province
    • Ratnapura District
[Chalcedony var: Carnelian]
[var: Amethyst]
Tanzania
 
  • Dodoma Region
    • Mpwapwa District (Mpwampwa)
      • Mpapwa
Dirlam et al. (1992)
UK
 
  • Scotland
    • Buchan Grampian
[var: Smoky Quartz] No reference listed
    • Tayside
      • Montrose
        • Usan
[Chalcedony var: Agate] [Specimen in the Natural History Museum, London]
Ukraine
 
  • Zhytomyr Oblast' (Zhitomir Oblast')
Smith and Smith (1995)
Uruguay
 
  • Artigas Department
[var: Amethyst] Gilg et al. (2003)
[var: Amethyst] mindat.org
USA
 
  • Arizona
    • Maricopa Co.
      • Mazatzal Mts
        • Four Peaks
[var: Amethyst] Lowell and Koivula (2004)
    • Navajo Co.
[Chalcedony var: Petrified Wood] Gemstones of the world, Walter Schumann, 2001, p.148
        • Petrified Forest National Park
[Chalcedony var: Petrified Wood]
  • California
    • Imperial Co.
      • Jacumba Mts
        • Jacumba District
          • Boulder Park
[Chalcedony] U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    • Inyo Co.
      • Amargosa Range
        • Black Mts
          • Jubilee Pass
[Chalcedony var: Jasper] Symons, Henry Heilbronner (1940), Quartz gem stones of California: Rocks & Minerals: 15: 41; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 317.
    • Kern Co.
      • Kramer District (Kramer Borate District)
[Chalcedony var: Petrified Wood]
    • San Diego Co.
      • San Ysidro Mts
        • Dulzura
          • Southeast of Dulzura
[Chalcedony] Kunz, George Frederick (1906), Precious stones: Mineral Resources U.S., 1905: 1323-1358; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 318.
    • Santa Clara Co.
      • Santa Cruz Mts
        • Paradise Valley
[Jasper var: Orbicular Jasper] Melhase, John (1934), A diversity of many fine minerals available in California for collectors: Oregon Mineralogist: 2(7): 7; Mineralogist, The (1935): 3(3): 34; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 318; www.cst.cmich.edu/users/dietr1rv/jasper.htm
    • Siskiyou Co.
      • Cascade Range
        • Bogus Mountain
[Chalcedony var: Bloodstone] Symons, Henry Heilbronner (1940), Quartz gem stones of California: Rocks & Minerals: 15: 41; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 318.
      • Klamath Mts
        • Cinnabar Camp
[Chalcedony var: Agate] U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    • Tulare Co.
      • Ivanhoe
        • Venice Hills
[Chalcedony var: Chrysoprase] Tucker, W. Burling (1919), El Dorado, Lassen, Modoc, Tehama, and Tulare Counties: California Mining Bureau. Report 15: 911; MacFall (1951), Gem Hunter's Guide, 1st ed.; Goodwin, Joseph Grant (1958), Mines and mineral resources of Tulare County, California: California Journal of Mines and Geology (Report 54): 54(3): 344; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 318; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 350, 424.
      • Tennessee Knob
[Chalcedony var: Chrysoprase] Kunz, George Frederick (1899), Precious stones: Mineral Resources U.S., 1898: 589; Tucker, W. Burling (1919), Tulare Counties: California Mining Bureau. Report 15: 911; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 318.
  • Georgia
    • Wilkes Co.
      • Jacksons Crossroads
[var: Amethyst] Laurs (2005)
  • Minnesota
    • Crow Wing Co.
[Chalcedony var: Binghamite] Gemstones of the world, W. Schumann, 2001, p. 204
  • Montana
    • Lewis and Clark Co.
      • East Helena
        • Eldorado Bar
[Chalcedony] E.Ya. Kievlenko (2003) Geology of gems, p. 70
  • Nevada
    • Humboldt Co.
      • Virgin Valley
[Chalcedony var: Petrified Wood] Gemstones of the world, Walter Schumann, 2001, p.148
  • North Carolina
    • Cleveland Co.
      • Shelby
  • Utah
    • Iron Co.
[Chalcedony] U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    • Juab Co.
      • Thomas Range
        • Topaz Mountain
[Chalcedony var: Agate] U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
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