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Glass

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Mount Shadwell, Mortlake, Victoria, Australia
© Judy Rowe

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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:
Mt. 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

    Hide Locality List
    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
      • South Gregory
        • Tenham Station
    		Zhidong Xie et al. , Lunar and Planetary Science XXXVI (2005), 1216.pdf
    • South Australia
      • Olary Province
        • Weekeroo Station
    		Bunch, T.E., Keil, K., and Olsen, E. (1970): Contributions to Mineralogy and Petrology 25, 297-340.
    • Victoria
      • Mortlake
    		W. D. Birch et al, Australian Journal of Mineralogy, Vol. 14, No. 1
    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
     
    • Central-West Region
      • Goiás
        • Amorinópolis
    		http://iavcei2004.free.cl/abstracts/Brod_ibxobhffgsxhpfgphnspm.doc.
    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
    		http://www.lpi.usra.edu/meetings/LPSC99/pdf/1774.pdf / Lunar and Planetary Science XXX, J. C. Bridges et al.
    • Guangdong Province
      • Shaoguan Prefecture
        • Wengyuan Co.
    		M. Chen and X. Xie, Eur. J. Mineral. , 1996, 8, pp. 325-333.
    • Shandong Province
      • Weifang Prefecture
        • Changle Co.
          • Wutu
    		Qiu Zhili, Wu Fuyuan, Yu Qingyuan, Xie Liewen, and Yang Shufeng (2005): Chinese Science Bulletin 50(22), 2602-2611.
    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
        • Millau
          • 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
     
    • Bihar
      • Hazaribagh District
    Italy
     
    • Basilicata
      • Potenza Province
        • Mt. 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
          • Cupaello Basso Locality
    		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
      • 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.
    F. Stoppa and Y. Liu, Eur. J. Mineral. , 1995, 7, pp. 391-402.
    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.
    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.
    • Japan Sea
      • 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.
    Papua New Guinea
     
    • West New Britain Province
    		Lowder, G.G. (1970): Contributions to Mineralogy and Petrology 26, 324-340.
    Paraguay
     
    • Central
    		Geological Survey Professional Paper 327 (U.S. Department of the Interior, 1959)
    Republic of Congo (Brazzaville)
     
    • Brazzaville Region (Renéville Region)
    		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
            • Khalilov District
              • Khabarnin massif
    		Sharkov, A.A. (2009): Lithology and Mineral Resources 44(1), 19-35.
    Slovakia
     
    • Banská Bystrica Region
      • Cérová Mts
    		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
      • Cabezzo 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)
    Ukraine
     
    • Nikolajev (Nikolayev; Nikolaev; Mykolayiv) 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
    • Zakarpat'ska Oblast'
      • 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
    Mineral and/or Locality
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