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Eglestonite

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About EglestoniteHide

02346100014948307535214.jpg
Thomas E. Egleston
Formula:
([Hg1+]2)3OCl3(OH)
Colour:
Yellow, orange-yellow, brown; turns dark brownish, then black, on exposure to light; yellow-brown to brown (transmitted light)
Lustre:
Adamantine, Resinous
Hardness:
Specific Gravity:
8.33 - 8.45
Crystal System:
Isometric
Name:
After Thomas E. Egleston [December 9, 1832 New York, New York, USA - January 15, 1900 New York, New York, USA]. Co-founder of the Columbia School of Mines. Professor of Mineralogy and Metallurgy, Columbia University, New York.
Eglestonite-Kadyrelite Series

Eglestonite is an alteration product of other mercury minerals (native Mercury, Cinnabar, etc.)

Not to be confused with the silicate eggletonite.


Classification of EglestoniteHide

Approved, 'Grandfathered' (first described prior to 1959)
First Published:
1903
3.DD.05

3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
D : With Hg
10.5.4.1

10 : OXYHALIDES AND HYDROXYHALIDES
5 : Am(O,OH)pXq
8.5.6

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

Physical Properties of EglestoniteHide

Adamantine, Resinous
Transparency:
Translucent
Colour:
Yellow, orange-yellow, brown; turns dark brownish, then black, on exposure to light; yellow-brown to brown (transmitted light)
Streak:
Yellow to greenish-yellow
Hardness:
2½ on Mohs scale
Tenacity:
Brittle
Fracture:
Irregular/Uneven, Conchoidal
Density:
8.33 - 8.45 g/cm3 (Measured)    8.61 g/cm3 (Calculated)

Optical Data of EglestoniteHide

Type:
Isotropic
Comments:
Exhibits weak anomalous birefringence at times.

Blackened immediately by hydrogen sulfide or ammonia. Decomposed by acids with separation of Calomel.

Chemical Properties of EglestoniteHide

Formula:
([Hg1+]2)3OCl3(OH)

Crystallography of EglestoniteHide

Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Ia3d
Cell Parameters:
a = 16.03 Å
Unit Cell V:
4,119.08 ų (Calculated from Unit Cell)
Morphology:
Dodecahedral, with striations parallel to the edges, and elongated on [001] at times, into almost hair-like forms. Octahedral and cubic forms less common. Massive; as crusts.

Type Occurrence of EglestoniteHide

Associated Minerals at Type Locality:
Reference:
Moses, A.J. (1903) Eglestonite, terlinguaite, and montroydite, new mercury minerals from Terlingua, Texas. American Journal of Science: 16: 253-263.

Other Language Names for EglestoniteHide

German:Eglestonit
Simplified Chinese:褐氯汞矿
Spanish:Eglestonita
Traditional Chinese:褐氯汞礦

Relationship of Eglestonite to other SpeciesHide

Common AssociatesHide

Calomel([Hg1+]2)Cl2
CinnabarHgS
MercuryHg
Associated Minerals Based on Photo Data:
5 photos of Eglestonite associated with CalciteCaCO3
1 photo of Eglestonite associated with Kleinite(Hg2N)(Cl,SO4) · nH2O
1 photo of Eglestonite associated with MontroyditeHgO
1 photo of Eglestonite associated with MoschellandsbergiteAg2Hg3
1 photo of Eglestonite associated with Calomel([Hg1+]2)Cl2
1 photo of Eglestonite associated with MercuryHg

Related Minerals - Nickel-Strunz GroupingHide

3.DD.05Kadyrelite([Hg1+]2)3OBr3(OH)Iso.
3.DD.10Poyarkovite([Hg1+]2)3Cl2O2Mon. 2/m : B2/b
3.DD.15Hanawaltite([Hg1+]2)3Hg2+(Cl,OH)2O3Orth. mmm (2/m 2/m 2/m)
3.DD.20Terlinguaite[Hg3]4+Hg2+Cl2O2Mon. 2/m : B2/m
3.DD.25PinchiteHg2+5Cl2O4Orth.
3.DD.30Gianellaite[(Hg2N)2](SO4)(H2O)xIso. 4 3m : F4 3m
3.DD.30Mosesite(Hg2N)(Cl,SO4,MoO4) · H2OIso. 4 3m : F4 3m
3.DD.35Kleinite(Hg2N)(Cl,SO4) · nH2OHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
3.DD.40Tedhadleyite([Hg1+]2)5Hg2+I2(Cl,Br)2O4Tric.
3.DD.45Vasilyevite([Hg1+]2)10I3Br2Cl(CO3)O6Tric. 1 : P1
3.DD.50Aurivilliusite([Hg1+]2)Hg2+2(I,Br,Cl)2O2Mon. 2/m : B2/b
3.DD.55TerlinguacreekiteHg2+3Cl2O2Orth.
3.DD.60Kelyanite([Hg1+]2)6Sb3+BrCl2O6Trig. 3
3.DD.65ComancheiteHg2+55N3–24(NH2,OH)4(Cl,Br)34Orth.

Related Minerals - Dana Grouping (8th Ed.)Hide

10.5.4.2Kadyrelite([Hg1+]2)3OBr3(OH)Iso.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

8.5.1SimonkolleiteZn5Cl2(OH)8 · H2OTrig. 3m (3 2/m) : P3m1
8.5.2Calomel([Hg1+]2)Cl2Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm
8.5.3Terlinguaite[Hg3]4+Hg2+Cl2O2Mon. 2/m : B2/m
8.5.4Poyarkovite([Hg1+]2)3Cl2O2Mon. 2/m : B2/b
8.5.5PinchiteHg2+5Cl2O4Orth.
8.5.7Kadyrelite([Hg1+]2)3OBr3(OH)Iso.
8.5.8ComancheiteHg2+55N3–24(NH2,OH)4(Cl,Br)34Orth.
8.5.9Kuzminite([Hg1+]2)(Br,Cl)2Tet.
8.5.10Moschelite([Hg1+]2)I2Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm
8.5.11Tocornalite(Ag,Hg)I

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 EglestoniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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: 174 pgs (143).
Rogers, A.F. (1911) Eglestonite from San Mateo County, California. American Journal of Science: 32(187): 48-50.
Bird, P.H. (1932) A new occurrence and x-ray study of mosesite. American Mineralogist: 17: 541-550.
Hedlik, A. (1948) Über die Formel und Struktur von Eglestonit Hg4Cl2O. Experientia, Basel: 4: 66.
Hedlik, A. (1950) Über Formel und Struktur dex Mercurooxychlorides Eglestonit. Tschermaks Mineralogische und Petrographische Mitteilungen: 1: 378-389.
Palache, Charles, Harry Berman & Clifford Frondel (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: 51-52.
Novikova T.I., Gorshkov E.N. (1975) Eglestonite from mercury ore occurrences in Central Tajikistan. Notes of WMO: 104(2) 234-236.
Mereiter, K., Zemann, J. (1976) Neubearbeitung des Quecksilberminerals Eglestonit: Kristallstruktur, chemische Zusammensetzung und Synthese. Tschermaks Mineralogische und Petrographische Mitteilungen: 23: 105-115.
Fleischer, M., Jambor, J. (1977) New mineral names. American Mineralogist: 62: 395-397.
Vershkovskaya, O.V., Chernistova, N.M., Vlasova, E.V., Valiyeva, A.A., Stepanov, I.I. (1979) New data on eglestonite. Doklady Akademii Nauk SSSR: 248: 715-718.
Vasilev, V.I., Lavrentiev, Yu.G. (1986) New data on the composition of eglestonite. Doklady Akademii Nauk SSSR: 287: 960-963.
Kovaleva, L.T., Vasiliev, V.I. (1987) New data on IR spectroscopic studies of eglestonite, shakhovite, and kuznetsovite. Geology and Geophysics: 2: 113-115.
Vasilev, V.I. (1987) Kadyrelite Hg4(Br, Cl)2O – a new oxyhalide of mercury from the Kadyrelsky ore occurrence. Zap. Vses. Mineral. Obshch.: 116: 733–737 (in Russian)
Mereiter, K., Zeeman, J., Hewat, A.W. (1992) Eglestonite, [Hg2]3Cl3O2H: confirmation of the chemical formula by neutron powder diffraction. American Mineralogist: 77: 839–842.

Internet Links for EglestoniteHide

Localities for EglestoniteHide

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.
Germany
 
  • Rhineland-Palatinate
    • Donnersbergkreis
      • 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.
Hartmut Hensel Collection, Neustadt/Wstr.
      • Kirchheimbolanden
        • Mörsfeld
Lapis 2001(6), 40
      • Rockenhausen
        • Stahlberg
Lapis 2001(6), 13-40
Hungary
 
  • Borsod-Abaúj-Zemplén County
    • Kazincbarcika District
      • Rudabánya
Szakáll,Fehér 2013
Kyrgyzstan
 
  • Batken Region
[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.
  • Osh Region
[Lapis 1993(11), 11-24]
Mexico
 
  • Guerrero
    • Taxco de Alarcón
Gallagher, D., & Siliceo, R. P. (1948). Geology of the Huahuaxtla Mercury District, State of Guerrero, Mexico (USGS Bulletin 960). US Government Printing Office.
Panczner (1987): 135-372.
  • San Luis Potosí
    • Moctezuma Municipality
      • 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.
  • Zacatecas
    • Plateros
Desor, J. (12/2017) P-XRD analysis on calomel mercury phases from San Onofre.
Russia
 
  • Tuva
    • Pi-Khem District
      • Uyuk Range
Canadian Mineralogist Feb. 1999; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow; 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
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow; 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.
  • Zabaykalsky Krai
    • Buriatia Republic (Buryatia)
      • Baunt District
        • North-Muya Range
          • Middle Kelyana River
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. (1983). Kelyanite, Hg36Sb3 (Cl, Br) 9028-a new mineral. International Geology Review, 25(7), 864-868.
South Africa
 
  • Limpopo
    • Murchison Range
      • Gravelotte
        • Monarch Cinnabar mine
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: 52; Cairncross, B., and Dixon, R., (1995) Minerals of South Africa. Geological Society of South Africa;
Spain
 
  • Andalusia
    • Almería
      • Huércal-Overa
        • Cuesta Alta
          • Cerro Minado Mines
FAVREAU et al. (2013)
  • Castile-La Mancha
    • Ciudad Real
      • Almadén mining district
        • Almadenejos
Sainz de Baranda Graf, B and Menor salvan, C. (2019) The Almadén mining district, Ciudad Real, Spain. The Mineralogical Record, 50 (1), 11-60.
USA
 
  • Arizona
    • Gila Co.
      • Mazatzal Mountains
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 153, 211.
  • Arkansas
    • Clark Co.
U.S. Geological Survey,2005, Mineral Resources Data System: U.S Geological Survey,Reston, Virginia
    • Howard Co.
U.S. Geological Survey,2005, Mineral Resources Data System: U.S Geological Survey,Reston, Virginia
    • Pike Co.
Roberts, A.C. et al (2003), The Canadian Mineralogist: 41(3): 721-725.
U.S. Geological Survey,2005, Mineral Resources Data System: U.S Geological Survey,Reston, Virginia
  • California
    • Kings Co.
      • Parkfield Mining 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.
      • New Idria Mining District
        • Goat Mountain
Dunning, Hadley, Cooper, Magnasco collections; Mineralogical Record (1993): 24: 471-475.
    • San Mateo Co.
      • Palo Alto area
No reference listed
Rogers, Austin Flint (1911a), Eglestonite from San Mateo County, California: American Journal of Science, 4th. Series: 32: 48-50; Bradley, W.W. (1918), Quicksilver resources of California, with a section on metallurgy and ore dressing: California Mining Bureau. Bulletin 78: 149; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 173-174.
      • Portola Valley
        • El Corte de Madera Rancho
Rogers, Austin Flint (1911a), Eglestonite from San Mateo County, California: American Journal of Science, 4th. Series: 32: 48-50; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 119.
      • Redwood City
Rogers, Austin Flint (1911a), Eglestonite from San Mateo County, California: American Journal of Science, 4th. Series: 32: 48-50; Woodhouse, C.D. (1934), A new occurrence of montroydite in California: American Mineralogist: 19: 603-604; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 197.
Davis, Fenelon Francis (1955), Mines and mineral resources of San Mateo County, California: California Journal of Mines and Geology: 51(4): 414-415; Holmes, Jr., G.W. (1965), Mercury in California: in: U.S. Bureau of Mines Information Circular 8252: 127; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 121-122.
Woodhouse, C.D. (1934), A new occurrence of montroydite in California: American Mineralogist: 19: 603-604; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 119, 174, 273.
    • Sonoma Co.
      • West Mayacmas Mining District
        • Castle Rock Springs area
Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 197; Cooper, Fen (2002) Mineral News: 18(10): 1-8.
  • Nevada
    • Humboldt Co.
      • Opalite Mining District
Rocks & Minerals, Nov. 1999; McCormack, J.K. (2000): Mineralium Deposita 35(8), 796-798.
      • Poverty Peak Mining District
NBMG Spec. Pub. 31 Minerals of Nevada
NBMG Spec. Pub. 31 Minerals of Nevada
    • Lander Co.
      • Warm Springs Mining District
NBMG Bull 80 Geology and Mineral Deposits of Lander County, Nevada
  • Texas
    • Brewster Co.
Rocks & Minerals: 66(3): 196-224.
Rocks & Minerals: 66(1): 202.
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: 52.
 
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