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Eglestonite

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Thomas E. Egleston
Formula:
(Hg2+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.


Hide all sections | Show all sections

Classification of EglestoniteHide

Approved, 'Grandfathered' (first described prior to 1959)
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:
(Hg2+2)3OCl3(OH)
IMA Formula:
Hg1+6OCl3(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

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(Hg2)2+Cl2
CinnabarHgS
MercuryHg
Associated Minerals Based on Photo Data:
Calcite5 photos of Eglestonite associated with Calcite on mindat.org.
Kleinite1 photo of Eglestonite associated with Kleinite on mindat.org.
Montroydite1 photo of Eglestonite associated with Montroydite on mindat.org.
Moschellandsbergite1 photo of Eglestonite associated with Moschellandsbergite on mindat.org.
Calomel1 photo of Eglestonite associated with Calomel on mindat.org.
Mercury1 photo of Eglestonite associated with Mercury on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

3.DD.05Kadyrelite(Hg2+2)3OBr3(OH)Iso.
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.20Terlinguaite(Hg2+2)Hg2+2Cl2O2Mon. 2/m : B2/m
3.DD.25PinchiteHg2+5Cl2O4Orth.
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.40Tedhadleyite(Hg+2)5Hg2+I2(Cl,Br)2O4Tric.
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
3.DD.55TerlinguacreekiteHg2+3Cl2O2Orth.
3.DD.60Kelyanite(Hg+2)6Sb3+BrCl2O6Mon.
3.DD.65ComancheiteHg2+55N3–24(NH2,OH)4(Cl,Br)34Orth.

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

10.5.4.2Kadyrelite(Hg2+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(Hg2)2+Cl2Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm
8.5.3Terlinguaite(Hg2+2)Hg2+2Cl2O2Mon. 2/m : B2/m
8.5.4Poyarkovite(Hg2+2)3Cl2O2Mon. 2/m : B2/b
8.5.5PinchiteHg2+5Cl2O4Orth.
8.5.7Kadyrelite(Hg2+2)3OBr3(OH)Iso.
8.5.8ComancheiteHg2+55N3–24(NH2,OH)4(Cl,Br)34Orth.
8.5.9Kuzminite(Hg2+2)(Br,Cl)2Tet.
8.5.10Moschelite(Hg2+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 (1903) American Journal of Science: 16: 253.
Hillebrand and Schaller (1909) USGS Bulletin 405: 143.
Rogers (1911) American Journal of Science: 32: 48.
Bird (1932) American Mineralogist: 17: 541.
Hedlik (1948) Experientia, Basel: 4: 66.
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.
American Mineralogist (1977): 62: 396.
Mereiter, K., J. Zeeman, and A.W. Hewat (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
    • Palatinate
      • Alsenz-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 Co.
    • Rudabányai Mts
      • Rudabánya
Szakáll,Fehér 2013
Kyrgyzstan
 
  • Osh Oblast
    • Alai Range (Alay Range)
[Lapis 1993(11), 11-24]
      • 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.
Mexico
 
  • Guerrero
    • Mun. de Taxco
      • Hauhauxtla
Panczner (1987): 135-372.
  • 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.
Russia
 
  • Eastern-Siberian Region
    • Transbaikalia (Zabaykalye)
      • 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
    • Tuva Republic
      • Pii-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.
South Africa
 
  • Limpopo Province
    • 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)
USA
 
  • Arizona
    • Gila Co.
      • Mazatzal Mts
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.
      • 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
          • Picacho Peak
Dunning, Hadley, Cooper, Magnasco collections; Mineralogical Record (1993): 24: 471-475.
    • San Mateo Co.
      • Emerald Lake Hills
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.
        • Upper Emerald Lake
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.
      • 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.
      • Redwood City
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.
      • Searsville
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.
    • Sonoma Co.
      • Mayacmas Mts (Mayacamas Mts)
        • West Mayacmas 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 District
Rocks & Minerals, Nov. 1999; McCormack, J.K. (2000): Mineralium Deposita 35(8), 796-798.
      • Poverty Peak District
NBMG Spec. Pub. 31 Minerals of Nevada
NBMG Spec. Pub. 31 Minerals of Nevada
    • Lander Co.
      • Warm Springs District
NBMG Bull 80 Geology and Mineral Deposits of Lander County, Nevada
  • Texas
    • Brewster Co.
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.
Rocks & Minerals: 66(3): 196-224.
Rocks & Minerals: 66(1): 202.
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