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Glass

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System:AmorphousHardness:5 - 6½
Name:From the Celtic word glas (bluish-green)


An amorphous, homogeneous material with a random liquid-like structure generally formed due to rapid cooling.
Glasses can be natural (such as obsidian) or artificial (e.g., in slags). Artificial glasses are predominantly composed of silica with a few impurities.

Crystals in igneous rocks may contain tiny inclusions of frozen melt, i.e., glass.

Classification of Glass

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Physical Properties of Glass

Lustre:Vitreous
Diaphaneity (Transparency):Transparent, Translucent, Opaque
Hardness (Mohs):5 - 6½
Hardness Data:Measured
Fracture:Conchoidal

Crystallography of Glass

Crystal System:Amorphous

Optical Data of Glass

Type:Isotropic

Other Names for Glass

Varieties:
AndaraMt. St. Helens Stone

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

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  • Localities for Glass

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Algeria
     
    • Annaba Province
      • Cap de Fer
    Eur. J. Mineral. , 1996, 8, pp. 625-638.
    • Skikda Province
      • Collo
        • Cape Bougaroun
    Eur. J. Mineral. , 1996, 8, pp. 625-638.
    • Tamanghasset Province
      • Ahaggar Mts (Hoggar Mts)
        • Atakor volcanic massif
    M. Girod, Bull. Soc. Franç. Minéral. Crist. , 1963, LXXXVI, pp. 121-125.
    M. Girod, Bull. Soc. Franç. Minéral. Crist. , 1963, LXXXVI, pp. 121-125.
    Antarctica
     
    • Eastern Antarctica
      • Queen Maud Land (Dronning Maud Land)
        • Queen Fabiola Mts (Yamato Mts)
    Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 44
    • Western Antarctica
      • Marie Byrd Land
        • Executive Committee Range
    R.H. Grapes et al. , Min. Mag. , August 2003, Vol. 67, N°4, pp. 639-651.
    Atlantic Ocean
     
    • Mid-Atlantic Ridge complex
    G. K. Czamanske and J.G. Moore, Geological Society of America Bulletin, Vol. 88, N° 4, pp. 587-599.
    G. K. Czamanske and J.G. Moore, Geological Society of America Bulletin, Vol. 88, N° 4, pp. 587-599.
    Australia
     
    • Queensland
      • Charters Towers Region
        • South Gregory
          • Tenham Station
    Zhidong Xie et al. , Lunar and Planetary Science XXXVI (2005), 1216.pdf
    • South Australia
      • Leigh Creek
    Baker, G. (1953): Transactions of the Royal Society of South Australia, 76, 1-20.
      • Olary Province
        • Weekeroo Station
    Bunch, T.E., Keil, K., and Olsen, E. (1970): Contributions to Mineralogy and Petrology 25, 297-340.
    • Victoria
      • Moyne Shire
        • Mortlake
    Birch, W. D., Wood, A., White, A. J. R., Mills, S. J. and Freeman, R. (2008): Aegirine-augite crystals in scoria from Mt Shadwell and Mt Anakie, Victoria, Australia. Australian Journal of Mineralogy 14, 37-42.
    Austria
     
    • Tyrol
      • North Tyrol
        • Ötz valley
          • Umhausen
    Eur. J. Mineral. , 1993, 5, pp. 893-902.
    Azerbaijan
     
    • Naxçıvan (Naxcivan; Nakhichevan) District
      • Shusha
    http://rruff.geo.arizona.edu/doclib/hom/roedderite.pdf.
    Brazil
     
    • Goiás
      • Amorinópolis
    http://iavcei2004.free.cl/abstracts/Brod_ibxobhffgsxhpfgphnspm.doc.
    Central African Republic
     
    • Lobaye Prefecture
      • Lobaye River (Bali River)
    Hoinkes, G., and Kurat, G. (1979): Meteoritics 14, 423.
    Chile
     
    • Antofagasta Region
      • El Loa Province
        • San Pedro volcano
    C. Lemanski, Jr. (re-entry of lost Mindat data).
    China
     
    • Anhui Province
      • Bozhou Prefecture
        • Qiaocheng District
          • Xiaoyanzhuang
    Kuiren Wang (1987): Geochimica 16(3)
    • Guangdong Province
      • Shaoguan Prefecture
        • Wengyuan Co.
    M. Chen and X. Xie, Eur. J. Mineral. , 1996, 8, pp. 325-333.
    • Heilongjiang Province (Manchuria; Dongbei Region)
      • Heihe Prefecture
        • Wudalianchi Co.
          • Wudalianchi volcanic cluster
    Ming Zhang (1984): Earth Science, Journal of China University of Geosciences 28(1)
    Ming Zhang (1984): Earth Science, Journal of China University of Geosciences 28(1)
    • Jilin Province (Manchuria; Dongbei Region)
      • Jilin Prefecture
        • Jilin City
    Wankang Huang, Yingwen Xie, and Jingming Pan (1978): Geochimica 7(1), 25-34
    • Shandong Province
      • Weifang Prefecture
        • Changle Co.
          • Wutu
    Ping Wang and Guochang Li (1996): Mineral Resources and Geology 16(4); Qiu Zhili, Wu Fuyuan, Yu Qingyuan, Xie Liewen, and Yang Shufeng (2005): Chinese Science Bulletin 50(22), 2602-2611
    • Yunnan Province
      • Dali Autonomous Prefecture
        • Heqing Co.
    Xianfan Liu, Xinzhi Zhan, Zhenmin Gao, Jiajun Liu, Chaoyang Li, and Wenchao Su (2000): Journal of Geodynamics 29(1-2), 141-147
    Democratic Republic of Congo (Zaïre)
     
    • Kivu
      • Goma
    Bull. Soc. Franç. Minéralo. Cristallo. , 1974, 97, p. 497.
    France
     
    • Auvergne
      • Puy-de-Dôme
        • Châtelguyon
          • Charbonnières-les-Varennes
    C. Lemanski, Jr. (re-entry of lost Mindat data).
    • Centre
      • Cher
        • Sancerre-Couy drilling
    Eur. J. Mineral. , 1993, 5, pp. 85-96.
    • Languedoc-Roussillon
      • Gard
        • Trèves
          • Mas Aubert
    R.C. Maury and P. Picot : "Conditions d'Apparition du Fer Natif dans une Enclave de Schistes Graphiteux d'une Basanite des Cévennes", Bulletin de Minéralogie, 1979, Vol. 102, N° 4, 326-332
    • Midi-Pyrénées
      • Aveyron
        • Saint-Beauzély
    Bull. Soc. Franç. Minéralo. Cristallo. , 1974, 97, pp. 465-469.
    • Provence-Alpes-Côte d'Azur
      • Bouches-du-Rhône
        • Aix-en-Provence
          • Peyrolles-en-Provence
    Y. Moëlo : "Compte-rendu de la réunion "Systématique des Minéraux" du 23 novembre 1989", Bull. Soc. Franç. Minéral.
    Germany
     
    • Bavaria
      • Swabia
        • Nördlingen
    G.R. Osinski et al. , Meteoritics and Planetary Science, V 39, Issue 10, Oct. 2004.
    Hungary
     
    • Nógrád Co.
      • Karancs-Medves Mts.
        • Bárna
    C. Szabó et al. , Eur. J. Mineral. , 1996, 8, pp. 881-899.
        • Salgótarján
    EGU / EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #748 "Silicate melt inclusions in olivine phenocrysts from Hegyestu (Bakony-Balaton Highland) and Pecsko alkaline basalts (Nograd-Gomor), Hungary"
    • Veszprém Co.
      • Balaton Uplands
        • Zánka
    XVI ECROFI European Current Research On Fluid Inclusions, Porto 2001, Abstracts (Eds F. Noronha, A. Dória and A. Guedes), Faculdade de Ciências do Porto, Departamento de Geologia, Memória nº 7, pp. 237-240. Porto, 2001
    India
     
    • Jharkhand
      • Hazaribagh District
    Italy
     
    • Basilicata
      • Potenza Province
        • Monte Vulture
    F. Stoppa and Y. Liu, Eur. J. Mineral. , 1995, 7, pp. 391-402.
    F. Stoppa and Y. Liu, Eur. J. Mineral. , 1995, 7, pp. 391-402.
    F. Stoppa and Y. Liu, Eur. J. Mineral. , 1995, 7, pp. 391-402.
    F. Stoppa and Y. Liu, Eur. J. Mineral. , 1995, 7, pp. 391-402.
    • Latium
      • Rieti Province
        • Rieti
          • Santa Rufina
    F. Stoppa and Y. Liu, Eur. J. Mineral. , 1995, 7, pp. 391-402.
    • Sicily
      • Catania Province
        • Northern Iblean plateau
    C. Lemanski, Jr. (re-entry of lost Mindat data).
    • Umbria
      • Perugia Province
        • Spoleto
    Stoppa.F., Wolley A.R. and Bailey K. (2004). Extrusive carbonatites and their meaning: the case of Italy. 32nd International Geological Congress, Florence - Italy, August 20-28, 2004, pag. 7-8. L. Terrazzi Ed., Firenze, 2004
      • Terni Province
        • Marsciano
          • San Venanzo
    V. V. Sharygin et al. , Eur. J. Mineral. , 1996, 8, pp. 1199-1212.; F. Stoppa and Y. Liu, Eur. J. Mineral. , 1995, 7, pp. 391-402.
        • Orvieto
    F. Stoppa and Y. Liu, Eur. J. Mineral. , 1995, 7, pp. 391-402.
    • Veneto
      • Padova Province
        • Euganei Hills
          • Faedo
    Passaglia E. and Taglavini A. (1995): Erionite from Faedo, Colli Euganei, Italy. N.Jb.Miner.Mh.,4, pagg.185-191.
    Japan
     
    • Honshu Island
      • Chugoku region
        • Shimane Prefecture
          • Hamada City
    Masaru Yamaguchi (1964) Petrogenic Significance of Ultrabasic Inclusions in Basaltic Rocks from Southwest Japan. Memoirs of the Faculty of Science, Kyushu University, Series D, Geology, 15, #1, 163-219.
    • Kyushu Region
      • Fukuoka Prefecture
        • Fukuoka City
    Masaru Yamaguchi (1964) Petrogenic Significance of Ultrabasic Inclusions in Basaltic Rocks from Southwest Japan. Memoirs of the Faculty of Science, Kyushu University, Series D, Geology, 15, #1, 163-219.
      • Saga Prefecture
        • Karatsu City (Higashi-Matsuura-gun)
    Masaru Yamaguchi (1964) Petrogenic Significance of Ultrabasic Inclusions in Basaltic Rocks from Southwest Japan. Memoirs of the Faculty of Science, Kyushu University, Series D, Geology, 15, #1, 163-219.
    • Tokyo Prefecture
      • Izu Archipelago
    Alfredo Petrov specimens
    Jordan
     
    • Safawi
    Eur. J. Mineral. , 1995, 7, pp. 1129-1135.
    Eur. J. Mineral. , 1995, 7, pp. 1129-1135.
    Eur. J. Mineral. , 1995, 7, pp. 1129-1135.
    Kazakhstan
     
    • Aktobe Province (Aqtöbe Oblysy; Aktubinskaya Oblast')
    Rob Lavinsky (ex. Howard Belsky specimen - irghisite meteorite impact glass)
    Kenya
     
    • Rift Valley Province
      • Hell’s Gate National Park
    Mineralogical Magazine, August 1998, V. 62, N° 4, pp. 477-486. / Journal of Petrology, Vol. 42, N° 4, pp. 825-845, 2001. / Mineralogical Magazine, Volume 66, Number 2, 1 April 2002, pp. 287-299(13) / The United Nations University, GEOTHERMAL TRAINING PROGRAMME Reports 2004, Number 1, Orkustofnun, Grensásvegur 9, IS-108 Reykjavík, Iceland
    New Caledonia
     
    • Northern Province
      • Nouméa Commune
        • Népoui
    T. Sameshima et al. , Am. Min. , 1983, 68, pp. 1076-1082. / C. Campiglio et al. , Bull. Minéral. , 1986, 109, pp. 423-440.
    Nigeria
     
    • Katsina State
    Zhidong Xie et al. , Lunar and Planetary Science XXXVI (2005), 1216.pdf
    Oman
     
    • Dhofar (Al Janubiyah) Province
    D.D. Badjukov et al. , Lunar and Planetary Science, XXXVI (2005), 1684.pdf
    The Meteoritical Bulletin, No. 88, 2004 JULY, Meteoritics & Planetary Science 39, Axxx–Axxx (2004)
    Pacific Ocean
     
    • East Pacific Rise
    R. Hekinian et al. , Bull. Minéral. , 1985, 108, pp. 691-698.
    Magnetite Olivine Pyroxene Plagioclase Glass Chalcedony Quartz Opaline “allophane” Kaolinite Chlorite Calcite Smectite Illite pyrite Sphalerite Chalcopyrite marcasite Wurtzite Covellite Goethite
    • Sea of Japan
      • Honshu Island borderland
    Markov, Y.D., Mozherovskii, A.V., Derkachev, A.N., Barinov, N.N., and Sereda, N.A. (2002): Lithology and Mineral Resources 37(2), 121-129.
    • South California Borderland
    Hein, J.R., Reid, J.A., Conrad, T.A., Dunham, R.E., Clague, D.A., Schulz, M.S., and Davis, A.S. (2010): USGS Open-File Report 10-1069
    Hein, J.R., Reid, J.A., Conrad, T.A., Dunham, R.E., Clague, D.A., Schulz, M.S., and Davis, A.S. (2010): USGS Open-File Report 10-1069
    Papua New Guinea
     
    • West New Britain Province
    Lowder, G.G. (1970): Contributions to Mineralogy and Petrology 26, 324-340.
    Paraguay
     
    • Central
      • Ypacaraí
    Geological Survey Professional Paper 327 (U.S. Department of the Interior, 1959)
    Republic of Congo (Brazzaville)
     
    • Brazzaville Department (Renéville Department)
    Bull. Soc. Franç. Minéralo. Cristallo. , 1974, 97, pp. 470-474.
    Russia
     
    • Eastern-Siberian Region
      • Saha Republic (Sakha Republic; Yakutia)
        • Daldyn-Alakit kimberlite field
          • Daldyn
    D.A. Zedgenizov et al. , Mineralogical Society of Gret Britain and Ireland, Feb. 2004, V68, N°1, pp. 61-73.
    • Urals Region
      • Southern Urals
        • Orenburgskaya Oblast'
          • Orsk
            • Khalilovskii District
              • Khabarninskii massif
    Sharkov, A.A. (2009): Lithology and Mineral Resources 44(1), 19-35.
    Slovakia
     
    • Banská Bystrica Region
      • Lučenec Co.
    M. Huraiova et al. , Eur. J. Mineral. , 1996, 8, pp. 901-916.
    South Africa
     
    • Free State Province
      • Boshof
    Mathias, M., Siebert, J.C., and Rickwood, P.C. (1970): Contributions to Mineralogy and Petrology 26, 75-123.
    Spain
     
    • Andalusia
      • Granada
    Bunch, T.E., Keil, K., and Olsen, E. (1970): Contributions to Mineralogy and Petrology 25, 297-340.
    • Canary Islands
      • Las Palmas Province
        • Gran Canaria (Grand Canary)
    V.R. Troll et al. , Contrib. Mineral. Petrol. , 2003, 145, PP. 730-741.
        • La Palma
    C.K. Brooksa, and I. Printzlau, (1978); Magma mixing in mafic alkaline volcanic rocks: the evidence from relict phenocryst phases and other inclusions
      • Santa Cruz de Tenerife Province
        • La Gomera
          • Valle Gran Rey
    Eur. J. Mineral. , 2002, 14, pp. 891-904.
    • Castile-La Mancha
      • Albacete
        • Cancarix
    E. Salvioli-mariani et al. , Eur. J. Mineral. , 1996, 8, pp. 1027-1039.
    • Murcia
      • Cartagena
        • Tallante
          • Cabezo Negro de Tallante
    S. Capedri et al. : "Upper-mantle xenoliths and megacrysts in an alkali basalt from Tallante, South-eastern Spain", Eur. J. Mineral. , 1989, 1, pp. 685-699.
    S. Capedri et al. : "Upper-mantle xenoliths and megacrysts in an alkali basalt from Tallante, South-eastern Spain", Eur. J. Mineral. , 1989, 1, pp. 685-699.
    S. Capedri et al. : "Upper-mantle xenoliths and megacrysts in an alkali basalt from Tallante, South-eastern Spain", Eur. J. Mineral. , 1989, 1, pp. 685-699.
    Switzerland
     
    • Fribourg (Freiburg)
      • Ulmiz
    Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Verlag Wepf & Co. (Basel), p. 500
    Tanzania
     
    • Kilimanjaro Region
      • Lashaine volcano
    J.B. Dawson, Journal of Petrology, 2002, V 43, N° 9, pp. 1749-1777.
      • Olmani Cinder Cone (Olmani Hill)
    R.L. Rudnick et al. , Earth and Planetary Science Letters, 114, 1993, pp. 463-475.
    The Moon
     
    Lunar and Planetary Science XXXV (2004)
    Lunar and Planetary Science XXXIV (2003) and XXXV (2004)
    • Mare Crisium
    Pavel Kartashov
    Ukraine
     
    • Mykolayiv (Nikolajev; Nikolayev; Nikolaev) Oblast'
    Semenenko, V.P. and A.L. Girich (1994) Mineralogy of a fragment in the unique graphite-containing Krymka chondrite (LL3): MM: 59: 396-443. www.minersoc.org/pages/Archive-MM/Volume_59/59-396-443.pdf
    • Transcarpathian Oblast' (Zakarpats'ka Oblast'; Zakarpattia)
      • Rakhivs’kiy rayon
        • Kvasy
    Keidel, W. (1965): Contributions to Mineralogy and Petrology 11, 487-506
    USA
     
    • Texas
      • Randall Co.
    Zhidong Xie et al. , Lunar and Planetary Science XXXVI (2005), 1216.pdf
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    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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