Donate now to keep alive!Help|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on Mindat
What is a mineral?The most common minerals on earthMineral PhotographyThe Elements and their MineralsGeological TimeMineral Evolution
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
StatisticsThe ElementsMember ListBooks & MagazinesMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery


This page is currently not sponsored. Click here to sponsor this page.
Yellow-, yellow-green, brown (darkens to olive-green on exposure to light); pale olive-green in transmitted light
2 - 3
Specific Gravity:
Crystal System:
Named after its discovery locality, Terlingua, Brewster County, Texas, USA.
This page provides mineralogical data about Terlinguaite.

Hide all sections | Show all sections

Classification of TerlinguaiteHide

Approved, 'Grandfathered' (first described prior to 1959)

D : Oxyhalides, hydroxyhalides and related double halides
D : With Hg

4 : A2(O,OH)Xq

8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
5 : Halides of Zn and Hg

Physical Properties of TerlinguaiteHide

Transparent, Translucent
Yellow-, yellow-green, brown (darkens to olive-green on exposure to light); pale olive-green in transmitted light
Lemon yellow
2 - 3 on Mohs scale
On {_101}
8.725 g/cm3 (Measured)    8.73 g/cm3 (Calculated)

Optical Data of TerlinguaiteHide

Biaxial (-)
RI values:
nα = 2.350 nβ = 2.640 nγ = 2.660
Measured: 20° , Calculated: 26°
Max Birefringence:
δ = 0.310
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
relatively strong
Slightly pleochroic in green and yellow.

Chemical Properties of TerlinguaiteHide

IMA Formula:

Crystallography of TerlinguaiteHide

Crystal System:
Class (H-M):
2/m - Prismatic
Space Group:
Cell Parameters:
a = 19.51 Å, b = 5.91 Å, c = 9.47 Å
β = 143.81°
a:b:c = 3.301 : 1 : 1.602
Unit Cell V:
644.75 ų (Calculated from Unit Cell)
Crystals prismatic [010] and often somewhat flattened on {001}; rarely prismatic in a pyramidal direction; also equidimensional, or thick tabular {001}. Pulverulent; massive aggregates of imperfect crystals (Dana, 7th. ed.: 53).

Crystallographic forms of TerlinguaiteHide

Crystal Atlas:
Image Loading
Click on an icon to view
Terlinguaite no.7 - Goldschmidt (1913-1926)
3d models and HTML5 code kindly provided by

Edge Lines | Miller Indicies | Axes

Opaque | Translucent | Transparent

Along a-axis | Along b-axis | Along c-axis | Start rotation | Stop rotation

Type Occurrence of TerlinguaiteHide

Other Language Names for TerlinguaiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Montroydite4 photos of Terlinguaite associated with Montroydite on
Edoylerite3 photos of Terlinguaite associated with Edoylerite on
Cinnabar3 photos of Terlinguaite associated with Cinnabar on
Kleinite2 photos of Terlinguaite associated with Kleinite on
Calomel2 photos of Terlinguaite associated with Calomel on

Related Minerals - Nickel-Strunz GroupingHide

3.DD.05Eglestonite(Hg2+2)3OCl3(OH)Iso. m3m (4/m 3 2/m) : Ia3d
3.DD.10Poyarkovite(Hg2+2)3Cl2O2Mon. 2/m : B2/b
3.DD.15Hanawaltite(Hg2+2)3Hg2+(Cl,OH)2O3Orth. mmm (2/m 2/m 2/m)
3.DD.30Gianellaite[(NHg2)2](SO4)(H2O)xIso. 4 3m : F4 3m
3.DD.30Mosesite(Hg2N)(Cl,SO4,MoO4) · H2OIso.
3.DD.35Kleinite(Hg2N)(Cl,SO4) · nH2OHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
3.DD.45Vasilyevite(Hg+2)10I3Br2Cl(CO3)O6Tric. 1 : P1
3.DD.50Aurivilliusite(Hg+2)0.5Hg2+(I,Br,Cl)OMon. 2/m : B2/b

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

8.5.1SimonkolleiteZn5Cl2(OH)8 · H2OTrig. 3m (3 2/m) : P3m1
8.5.2Calomel(Hg2)2+Cl2Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm
8.5.4Poyarkovite(Hg2+2)3Cl2O2Mon. 2/m : B2/b
8.5.6Eglestonite(Hg2+2)3OCl3(OH)Iso. m3m (4/m 3 2/m) : Ia3d
8.5.10Moschelite(Hg2+2)I2Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm

Other InformationHide

Turns black immediately when treated with hydrogen sulfide. Ammonia causes a slower change to black. Decomposed with separation of calomel by acetic, hydrochloric, and nitric acids.
Health Risks:
Contains mercury - always wash hands after handling. Avoid inhaling dust when handling or breaking. Never lick or ingest.

References for TerlinguaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Turner, W.H. (1900) Terlinguaite. in The Terlingua Mining District, Brewster Co., Texas, Mining and Scientific Press (San Francisco): 21 July 1900.
Turner, H.W. (1900) The Terlinqua Quicksilver deposits. Economic Geology: 1: 265-281.
Moses, A.J. (1903) Eglestonite, terlinguaite, and montroydite, new mercury minerals from Terlingua, Texas. American Journal of Science: 16: 253-263.
Moses, A.J. (1904) Eglestonit, terlinguaït und montroydit, neue quecksilbermineralien von Terlingua in Texas. Zeitschrift für Kristallographie: 39: 3-13.
Hillebrand, W.F., Schaller, W.T. (1909) The mercury minerals from Terlingua, Texas. United States Geological Survey Bulletin 405: 174p.
Palache, C., Berman, H., Frondel, C. (1951) The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume II: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 52-56.
Šćavničar, S. (1956) The crystal structure of oxy-mercuric-mercurous chloride, 2HgO.Hg2Cl2. Acta Crystallographica: 9: 956-959.
Aurivillius, K., Folkmarson, L. (1968) The crystal structure of terlinguaite Hg4O2Cl2. Acta Chemica Scandinavica: 22: 2529-2540.
Brodersen, K., Göbel, G., Liehr, G. (1989) Terlinguait Hg4Cl2O2 – ein Mineral mit ungewöhnlichen Hg3-Baueinheiten. Journal of Inorganic and General Chemistry: 575(1): 145-153.

Internet Links for TerlinguaiteHide

Localities for TerlinguaiteHide

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.
  • Tyrol
    • North Tyrol
      • Inn valley
        • Brixlegg - Schwaz area
          • Brixlegg - Rattenberg
            • Geyer - Silberberg District
              • Silberberg
Schnorrer, G. and Poeverlein, R. (2002) Schwaz-Brixlegg-Fundstellen: 2. Die Minerale des Stockerstollens bei Brixlegg in Tirol. Aufschluss, 53, 209-228.
  • Rhineland-Palatinate
    • Palatinate
      • Alsenz-Obermoschel
        • Obermoschel
Lapis 2001(6), 13-40
Stephan Wolfsried collection
Dreyer, G. (1975): Neue Mineralien in der Rheinpfalz II, Mitteilungen der Pollichia, 63, 5-9.
  • Osh Oblast
    • Alai Range (Alay Range)
[Lapis 1993:11 p11-24]
      • Fergana Valley
[Lapis 11:11-24]; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow; Vasil'yev, V. I., Lavrent'yev, Y. G., & Pal'chik, N. A. (1982). Poyarkovite, Hg3CIO, a new natural mercury oxychloride. International Geology Review, 24(3), 363-366.
  • Guerrero
    • Mun. de Taxco
      • Hauhauxtla
Panczner (1987): 135-372.
      • Huahuaxtla
  • San Luis Potosí
    • Mun. de Moctezuma
      • Moctezuma
        • Hacienda de Santa Antonio de Rul
Panczner(1987):135,164,185 & 372.; Percy Babb (1909) Dulces Nombres Quicksilver Deposit, Mexico. Engineering & Mining Journal 684-686.
  • Eastern-Siberian Region
    • Tuva Republic
      • Pii-Khem District
        • Uyuk Range
Canadian Mineralogist Feb. 1999; Pervukhina, N. V., Vasil’ev, V. I., Borisov, S. V., Magarill, S. A., & Naumov, D. Y. (2003). The crystal structure of a polymorph of Hg2+ 3S2Br1. 0Cl0. 5I0. 5. The Canadian Mineralogist, 41(6), 1445-1453.
          • Oorash-Khem River Valley
Pervukhina, N. V., Vasil’ev, V. I., Borisov, S. V., Magarill, S. A., & Naumov, D. Y. (2003). The crystal structure of a polymorph of Hg2+ 3S2Br1. 0Cl0. 5I0. 5. The Canadian Mineralogist, 41(6), 1445-1453.
  • Arkansas
    • Pike Co.
Roberts, A.C. et al (2003), The Canadian Mineralogist: 41(3): 721-725.
  • California
    • Kings Co.
      • Diablo Range
        • Parkfield District
          • Table Mountain
Bailey, Edgar H. (1942), Quicksilver deposits of the Parkfield district, California: USGS Bulletin 936-F: 159; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 115, 197.
    • San Benito Co.
      • Diablo Range
        • New Idria District
          • Goat Mountain
Mineralogical Record: 36(4): 337-363.
    • San Mateo Co.
      • Redwood City
Dunning, Gail, The Challenge Mercury Deposit, Redwood City, San Mateo County, California., BAM Journal, Vol. 9 No. 1.
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 150, 260, 262, 362.
  • Nevada
    • Humboldt Co.
      • Opalite District
Rocks & Minerals, Nov. 1999
      • Poverty Peak District
NBMG Spec. Pub. 31 Minerals of Nevada
NBMG Spec. Pub. 31 Minerals of Nevada
  • Oregon
    • Malheur Co.
McCormack, J.K. (2000): Mineralium Deposita 35(8), 796-798.
  • Texas
    • Brewster Co.
Mining & Scientific Press, San Francisco, 21. July 1900; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 55; Mineralogical Record: 21: 233.
Rocks & Minerals: 66(3): 196-224.
Rocks & Minerals: 66(1): 202.
Kelly Nash Collection
Mineral and/or Locality is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © and the Hudson Institute of Mineralogy 1993-2018, except where stated. relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: February 18, 2018 06:48:35
Go to top of page