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Eglestonite

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Thomas E. Egleston
Formula:
(Hg22+)3OCl3(OH)
System:
Isometric
Colour:
Yellow, orange-yellow, ...
Lustre:
Adamantine, Resinous
Hardness:
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 Eglestonite

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 Eglestonite

Adamantine, Resinous
Diaphaneity (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 (Mohs):
Tenacity:
Brittle
Fracture:
Irregular/Uneven, Conchoidal
Density:
8.33 - 8.45 g/cm3 (Measured)    8.61 g/cm3 (Calculated)

Optical Data of Eglestonite

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 Eglestonite

Formula:
(Hg22+)3OCl3(OH)
IMA Formula:
Hg61+OCl3(OH)
Elements listed in formula:

Crystallography of Eglestonite

Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Ia3d
Cell Parameters:
a = 16.03 Å
Unit Cell Volume:
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 Eglestonite

Associated Minerals at Type Locality:

Relationship of Eglestonite to other Species

Series:
Forms a series with Kadyrelite (see here)
Common Associates:
3.DD.05Kadyrelite(Hg22+)3OBr3(OH)
3.DD.10Poyarkovite(Hg22+)3Cl2O2
3.DD.15Hanawaltite(Hg22+)3Hg2+(Cl,OH)2O3
3.DD.20Terlinguaite(Hg22+)Hg22+Cl2O2
3.DD.25PinchiteHg52+Cl2O4
3.DD.30Gianellaite[(NHg2)2](SO4)(H2O)x
3.DD.30Mosesite(Hg2N)(Cl,SO4,MoO4) · H2O
3.DD.35Kleinite(Hg2N)(Cl,SO4) · nH2O
3.DD.40Tedhadleyite(Hg2+)5Hg2+I2(Cl,Br)2O4
3.DD.45Vasilyevite(Hg2+)10I3Br2Cl(CO3)O6
3.DD.50Aurivilliusite(Hg2+)0.5Hg2+(I,Br,Cl)O
3.DD.55TerlinguacreekiteHg32+Cl2O2
3.DD.60Kelyanite(Hg2+)6Sb3+BrCl2O6
3.DD.65ComancheiteHg552+N243–(NH2,OH)4(Cl,Br)34
8.5.1SimonkolleiteZn5Cl2(OH)8 · H2O
8.5.2Calomel(Hg2)2+Cl2
8.5.3Terlinguaite(Hg22+)Hg22+Cl2O2
8.5.4Poyarkovite(Hg22+)3Cl2O2
8.5.5PinchiteHg52+Cl2O4
8.5.7Kadyrelite(Hg22+)3OBr3(OH)
8.5.8ComancheiteHg552+N243–(NH2,OH)4(Cl,Br)34
8.5.9Kuzminite(Hg22+)(Br,Cl)2
8.5.10Moschelite(Hg22+)I2
8.5.11Tocornalite(Ag,Hg)I

Other Names for Eglestonite

Name in Other Languages:
German:Eglestonit
Simplified Chinese:褐氯汞矿
Spanish:Eglestonita
Traditional Chinese:褐氯汞礦

Other Information

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 Eglestonite

Reference List:
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 Eglestonite

mindat.org URL:
https://www.mindat.org/min-1357.html
Please feel free to link to this page.

Localities for Eglestonite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
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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