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About HyaliteHide

SiO2 · nH2O
colorless, white, creme-colored, yellow, orange
Vitreous, Sub-Vitreous
5½ - 6½
Specific Gravity:
2.0 - 2.2
Named from ύαλος ('glass') from its appearance, by A.G.Werner in 1794
A variety of Opal

A colourless variety of Opal. Hyalite is opal-AN, an amorphous silica-glass containing about 3-8% water.
Because it has a different structure, it does not show the opalescence (play of color) that is found in precious opal.

Hyalite occurs as globular and botryoidal masses and irregular crusts in volcanic and pegmatite environments where the silica deposits from the gas phase (Flörke et al, 1973). It often shows a strong green fluorescence in UV light.

The refractive index varies slightly with water content and lies between 1.44 and 1.46 (Graetsch, 1994). Hyalite is optically isotropic, but may show strain birefringence (Graetsch, 1994).

Visit for gemological information about Hyalite.

Pronounciation of HyaliteHide

PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of HyaliteHide

Vitreous, Sub-Vitreous
Transparent, Translucent
colorless, white, creme-colored, yellow, orange
no opalescence (play of color)
5½ - 6½ on Mohs scale
None Observed
2.0 - 2.2 g/cm3 (Measured)    
varies with water content

Chemical Properties of HyaliteHide

SiO2 · nH2O

Geological EnvironmentHide

Geological Setting:
Volcanic vugs, pegmatite pockets, fumaroles.

Other Language Names for HyaliteHide

Simplified Chinese:玻璃蛋白石

Common AssociatesHide

Associated Minerals Based on Photo Data:
8 photos of Hyalite associated with QuartzSiO2
6 photos of Hyalite associated with CleavelanditeNa(AlSi3O8)
6 photos of Hyalite associated with MuscoviteKAl2(AlSi3O10)(OH)2
4 photos of Hyalite associated with ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
4 photos of Hyalite associated with Lepidolite
4 photos of Hyalite associated with Smoky QuartzSiO2
4 photos of Hyalite associated with Opal-ANSiO2 · nH2O
4 photos of Hyalite associated with SchorlNa(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
3 photos of Hyalite associated with BixbyiteMn3+2O3
3 photos of Hyalite associated with Feldspar Group

Fluorescence of HyaliteHide

May show strong green UV fluorescence

Other InformationHide

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

References for HyaliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Graetsch, H. (1994) Structural characteristics of opaline and microcrystalline silica minerals. In: Reviews in Mineralogy, Volume 29, Silica - Physical behavior, geochemistry and materials applications. Mineralogical Society of America, Washington, D.C.
Flörke, O.W., Jones, J.B., Segnit, E.R. (1973) The genesis of hyalite. Neues Jahrbuch der Mineralogie, Monatshefte, H.2, 82-89.

Internet Links for HyaliteHide

Localities for HyaliteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
  • Nuristan
    • Kamdesh District
Jose Zendrera collection
  • New South Wales
    • Burnett Co.
Porter, D.A. (1894) Journal and Proceedings of the Royal Society of New South Wales 28:41.
    • Pottinger Co.
Steve Sorrell Collection
Kennon, N.F., Carr, P.F. (2009) History and mineralogy of the Mullaley prehnite locality, New South Wales. Australian Journal of Mineralogy, Vol.15, 3-11.
    • Rous Co.
      • Ballina
        • Shelly Beach
Collection of RJ Martin
  • Tasmania
    • Tasman Municipality
R Bottrill collection
  • Burgenland
    • Oberwart District
Carolus Clusius (1601) Rariorum plantarum historia
  • Potosí
    • Cornelio Saavedra Province
      • Machacamarca mining district (Colavi mining district)
Pough, F. H. (1976) Peterson Field Guides - Rocks and Minerals, 4th Ed., plate 34.
  • Bahia
Sauer, J.R. (1982) Brazil, Paradise of Gemstones. Gemological Institute of America, 135 pp. (p. 70).
  • Rio Grande do Norte
Sauer, J.R. (1982) Brazil, Paradise of Gemstones. Gemological Institute of America, 135 pp. (p. 70).
    • Parelhas
de Brito Barreto, S., & Bretas Bittar, S. M. (2010). Los depósitos de gemas de Brasil: localización, producción e impacto económico. Boletín de la Sociedad Geológica Mexicana, 62(1), 123-140.
  • Rio Grande do Sul
    • Caxias do Sul
Fernando Brederodes Collection
  • Ontario
    • Hastings County
      • Dungannon Township
        • York River area
Michael Adamowicz Collection
  • Anhui
    • Xuancheng
      • Jixi Co.
National Geological Archives of China database, record no. X00038564
Czech Republic
  • Ústí nad Labem Region
    • Litoměřice District
P.Zeman,P.Pauliš,P.Pour,R.Malíková (2017) Zeolites of Pohorský Hill and district. mag.Minerál 2017/2
    • Ústí nad Labem District
  • Pays de la Loire
    • Loire-Atlantique
      • Nantes
        • Indre
Baret, Ch. (1905): Catalogue de la Collection de Minéralogie de la Loire-Inférieure, Muséum de Nantes, 92.
  • Provence-Alpes-Côte d'Azur
    • Var
      • Les Adrets-de-l'Estérel
S. MAURY (S), 2015 - Les indices minéralogiques de l'Estérel, 1ère partie. Le Cahier des Micromonteurs, n°128 (2-2015), pp 17-33
      • Saint Raphael
        • Agay
MAURY (S), 2015 - Les indices minéralogiques de l'Estérel, 1ère partie. Le Cahier des Micromonteurs, n°128 (2-2015), pp 17-33
  • Baden-Württemberg
    • Freiburg Region
      • Breisgau-Hochschwarzwald
        • Bötzingen
Weisenberger, T.B., Spürgin, S., Lahaye, Y. (2014): Hydrothermal alteration and zeolitization of the Fohberg phonolite, Kaiserstuhl Volcanic Complex, Germany, International Journal of Earth Sciences, Vol. 103 (8). 2273-2300
  • Hesse
    • Darmstadt
      • Frankfurt
Jordan, J. L. (1803) Mineralogische berg- und hüttenmännische Reisebemerkungen vorzüglich in Hessen, Thüringen, am Rheine und im Sayn-Altenkirchner Gebiete gesammelt. 288 pp +Tafeln, Göttingen.
      • Main-Kinzig-Kreis
        • Neuberg
Bischof, C. (1874): Verschiedener Grad der Strengflüssigkeit (Feuerfestigkeit) der Quarzarten, resp. der beiden Zustände der Kieselerde, besonders in Verbindung mit Thonerde. Polytechnisches Journal 174, 140-146.; Collection of Volker Betz
  • Borsod-Abaúj-Zemplén County
    • Tokaj District
      • Erdőbénye
Society of Economic Geologists Student Chapter University of Miskolc (2018) Short course – Industrial minerals in the NE part of Hungary. Telkibánya November 5–8. 2018.
Sujatmiko, Dr H. C. Einfalt, Dr U. Henn (2007) Opal from Java, Indonesia and Its Varieties.
  • Piedmont
    • Metropolitan City of Turin
      • Luserna Stone Quarries
Collection Giuseppe Finello
      • Mezzenile
        • Pugnetto
Curlo, G. (1929) Sopra alcune concrezioni stalattitiformi silicee della Grotta di Pugnetto (Valle di Lanzo). Annali del Museo Civico di Storia Naturale di Genova, 53 (1928-1930), 461-464.
    • Verbano-Cusio-Ossola Province
      • Mergozzo
Roggiani A.G. (1969): Opale jalite e scheelite nel granito bianco del Montorfano. Rend. Soc. Ital. Mineral. Petr., 25, 2, 549-552; Boscardin M. (1972): Informazioni di mineralogia italiana. 21) Opale jalite e scheelite del Montorfano. Notizie Gruppo Mineral. Lombardo, 3, 1 (marzo 1972), 8. ; De Michele V. (1974): Guida mineralogica d'Italia. Istituto Geografico De Agostini, Novara, 2 vol., 408 pp.
  • Sardinia
    • South Sardinia Province
      • San Vito
Stara, P., Rizzo, R., Brizzi, G. (1993) Sarrabus. Miniere e Minerali. Associazione Mineralogica Sarda, Gruppo Mineralogico Lombardo, Associazione Piemontese Mineralogia Paleontologia e Mostra Torinese Minerali, Centro Mineralogico Varesino, Amici Mineralogisti Fiorentini, Gruppo Mineralogico Paleontologico Piacentino, et al., Stige Milano Srl, Milano, 208 pp.
  • Gifu Prefecture
    • Nakatsugawa City
      • Hirukawa
Yamada, S. (2004) Nihonsan-koubutsu Gojuon-hairetsu Sanchi-ichiranhyou (111 pp.)
  • Kagoshima Prefecture
    • Kagoshima District
      • Mishima village
        • Satsuma-Ioujima (Satsuma-Iwojima; Iou island)
Amir Akhavan Collection
  • Okayama Prefecture
Yamada, S. (2004) Nihonsan-koubutsu Gojuon-hairetsu Sanchi-ichiranhyou (111 pp.)
  • San Luis Potosí
    • Villa de Reyes Municipality
Panczner, W.D. (1987) Minerals of Mexico. Van Nostrand Reinhold Company, New York, 459 pp.
New Zealand
  • Bay of Plenty Region
    • Rotorua District
Collection of RJ Martin
      • Okataina
Collection of Rod Martin
  • Wellington Region
    • South Wairarapa District
      • Red Hill
CF Johnson collection; Collected by CF Johnson
  • Vestland
    • Ullensvang
      • Odda
        • Hardangervidda West
Nordrum, F. S. (2015): Anatas und weitere Mineralien aus der westlichen Hardangervidda, Norwegen. Mineralien-Welt. 26(6), 56-85
  • Gilgit-Baltistan
    • Skardu District
      • Braldu Valley
Ikram Mineralogy
  • Lower Silesian Voivodeship
    • Lwówek Śląski County
      • Gmina Mirsk
        • Proszowa
Adamczyk Z. (2008) Ewolucja wulkanizmu kenozoicznego Przedgórza Rębiszowskiego (Dolny Śląsk)
    • Świdnica County
      • Gmina Strzegom
        • Strzegom
- Glocker E.F. (1829) - Über den schlesischen Hyalith, besonders über einige neu entdeckte Formen desselben, sowie über dessen Vorkommen und Entstehung Nova Acta Physico-Medica Bd.14 - Lasaulx A. v. (1876) - Über ein Hyalith-Vorkommen am Breitenberg bei Striegau. Neues Jahrbuch für Mineralogie
  • Opole Voivodeship
Roemer, C.F. (1870) Geologie von Oberschlesien: Erläuterungen + 50 Tafeln [Geology of Upper Silesia: Explanations + 50 panels]. Druck von R. Nischkowsky, Breslau, 587 pages.
  • Irkutsk Oblast
    • Lake Baikal area
Skovitina, T. M., E.V.Sklayrov, O.A.Sklyarova, A. B.Kotov, E.V.Tolmacheva, S.D.Velikoslavinsky (2014) Late Quaternary geyserites of the Ol’khon region (northern part of the Central Asian Orogenic Belt): geological setting, age and composition. in Abstract Volume IAGR Conference Series No. 20, pp.128–129
South Africa
  • Gauteng
    • Pretoria District (Tshwane District)
Atanasova, M., Cairncross, B. and Windisch, W.R. (2016) Microminerals of the Bushveld Complex, South Africa. Popular Geoscience Series 6, Council for Geoscience, Pretoria, South Africa
  • Valais
    • Goms
      • Binn
Schwanz, J. (1994): Das Binntal und seine Mineralien. - Hrsg. und Verlag André Gorsatt, Binn. 271 pp.
    • Östlich Raron
      • Grengiols
Gorsatt, A. (Ed.) (2014): Die besten Seiten des Binntals. Mineraliensuche - Alpenblumen - Ortsgeschichten. KristalloGrafik Verlag, Achberg, Deutschland, 344 pp.
  • Alabama
    • Cherokee Co.
Barwood, H. (1974) Iron Phosphate Mineral Locality at Indian Mountain, Alabama. The Mineralogical Record: 5(5): p. 242.
  • Arizona
    • Coconino County
      • Cameron Mining District
        • Cameron
          • Montezuma group of claims
Scarborough, Robert B. (1981), Radioactive occurrences and uranium production in Arizona, Arizona Bureau of Geology and Mineral Technology Report for U.S. Department of Energy (Atomic Energy Commission), GJBX-143. RME-2071: 156.
Scarborough, Robert B. (1981), Radioactive occurrences and uranium production in Arizona, Arizona Bureau of Geology and Mineral Technology Report for U.S. Department of Energy (Atomic Energy Commission), GJBX-143. RME-2071: 156.
  • California
    • San Bernardino Co.
      • Bullion Mts (Bullion Range)
        • Stedman District (Ludlow; Rochester; Buckeye)
          • Stedman
Robert E.Walstrom Collection
      • Lucerne Valley Limestone District
        • Lucerne Valley
Howard H. J. (2011) Geology and fluorescent minerals in the White Knob Quarry Lucerne Valley, California. in Lasemi, Z., & Mikulic, D. G. (2011). The 47th Forum on the Geology of Industrial Minerals. p10
    • Ventura Co.
      • Santa Monica Mountains
        • Thousand Oaks
DeVito, A. N. (1992), Brookite and stilbite in the Santa Monica Mountains. Bull. Min. Soc. So. Calif.: 62(2) (Feb 1992): 7.
  • Maine
    • Oxford County
      • Greenwood
        • Uncle Tom Mountain
Falster, A. U., Simmons, W. B., Webber, K. L., Dallaire, D. A., Nizamoff, J. W., & Sprague, R. A. (2019). The Emmons Pegmatite, Greenwood, Oxford County, Maine. Rocks & Minerals, 94(6), 498-519.
      • Paris
  • Maryland
    • Anne Arundel Co.
Jat Thompson Collection
    • Baltimore Co.
      • Windsor Mill
Jat Thompson
  • Nevada
    • Humboldt Co.
      • Opalite Mining District
Visual Id by Michael Cox
    • Pershing Co.
      • Seven Troughs Mining District
Robert E. Walstrom Collection
  • New Hampshire
    • Carroll Co.
      • Wakefield
P. Cristofono collection (ex. Gene Bearss)
    • Sullivan Co.
      • Springfield
P. Cristofono collection, 2015
  • South Carolina
Speer, J.Alexander.,(1987) Evolution of magmatic AFM mineral assemblages in granitoid rocks :The hornblende+melt = biotite reaction in the Liberty Hill pluton, South Carolina :American Mineralogist,Vol. 72, pg. 863-878 ,1987
Speer, J.Alexander.,(1987) Evolution of magmatic AFM mineral assemblages in granitoid rocks :The hornblende+melt = biotite reaction in the Liberty Hill pluton, South Carolina :American Mineralogist,Vol. 72, pg. 863-878 ,1987
Speer, J.Alexander.,(1987) Evolution of magmatic AFM mineral assemblages in granitoid rocks :The hornblende+melt = biotite reaction in the Liberty Hill pluton, South Carolina :American Mineralogist,Vol. 72, pg. 863-878 ,1987
  • Utah
    • Juab Co.
      • Thomas Range
Rockpick Legend
  • Washington
    • Okanogan Co.
      • Golden Horn Batholith
John Lindell field collected specimens
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