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Eglestonite

A valid IMA mineral species - grandfathered

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Photos of Eglestonite (51)Discuss Eglestonite

Eglestonite Gallery Search Photos of Eglestonite

Edit Eglestonite Add Synonym Edit CIF structures Clear Cache

Eglestonite, etc.

Clear Creek claim, Goat Mountain, San Benito County, California, USA

Eglestonite

Mariquita Mine, Usagre, Badajoz, Extremadura, Spain

Eglestonite

Backofen Mine, Landsberg, Obermoschel, Nordpfälzer Land, Donnersbergkreis, Rhineland-Palatinate, Germany

Eglestonite, etc.

Clear Creek claim, Goat Mountain, San Benito County, California, USA

Eglestonite

Mariquita Mine, Usagre, Badajoz, Extremadura, Spain

Eglestonite

Backofen Mine, Landsberg, Obermoschel, Nordpfälzer Land, Donnersbergkreis, Rhineland-Palatinate, Germany

Eglestonite, etc.

Clear Creek claim, Goat Mountain, San Benito County, California, USA

Eglestonite

Mariquita Mine, Usagre, Badajoz, Extremadura, Spain

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About EglestoniteHide

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:

2½

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.

Type Locality:

ⓘ Terlingua Mining District, Texas, USA

Eglestonite-Kadyrelite Series

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

Not to be confused with the silicate eggletonite.

Unique IdentifiersHide

Mindat ID:

1357

Long-form identifier:

mindat:1:1:1357:0

Similar NamesHide

Eggletonite

A valid IMA mineral species

(Na,K,Ca)_xMn₆(Si,Al)₁₀O₂₄(OH)₄ · nH₂O (x = 1-2; n = 7-11)

IMA Classification of EglestoniteHide

IMA status:

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

IMA Formula:

Hg¹⁺₆OCl₃(OH)

First published:

1903

Type description reference:

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

Classification of EglestoniteHide

Strunz-mindat (2026):

3.DD.05

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

Dana 8th ed.:

10.5.4.1

10 : OXYHALIDES AND HYDROXYHALIDES
5 : A_m(O,OH)_pX_q

Hey's CIM Ref.:

8.5.6

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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Symbol	Source	Reference for Standard
Egl	IMA–CNMNC	Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of EglestoniteHide

Lustre:

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.

Chemistry of EglestoniteHide

Mindat Formula:

[Hg₂]²⁺₃OCl₃(OH)

Element Weights:

Element	% weight
Hg	89.622 %
Cl	7.920 %
O	2.383 %
H	0.075 %

Calculated from ideal end-member formula.

Elements listed:

Cl, H, Hg, O - search for minerals with similar chemistry

Crystallography of EglestoniteHide

Crystal System:

Isometric

Class (H-M):

m3m(4/m32/m) - Hexoctahedral

Space Group:

Ia3d

Cell Parameters:

a = 16.03 Å

Unit Cell V:

4,119.08 Å³ (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.

Crystal StructureHide

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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure

ID	Species	Reference	Year	Temp (K)
0001530	Eglestonite	Mereiter K, Zemann J, Hewat A W (1992) Eglestonite, (Hg2)3Cl3O2H: confirmation of the chemical formula by neutron powder diffraction sample SN examined by powder neutron diffraction American Mineralogist 77 839-842	1992	293
0001529	Eglestonite	Mereiter K, Zemann J, Hewat A W (1992) Eglestonite, [Hg2]3Cl3O2H: Confirmation of the chemical formula by neutron powder diffraction sample SX examined by single-crystal X-ray diffraction American Mineralogist 77 839-842	1992	293
0015660	Eglestonite	Mereiter K, Zemann J (1976) Neubearbeitung des quecksilberminerals eglestonit: kristallstruktur, chemische zusammensetzung und synthese Tschermaks Mineralogische und Petrographische Mitteilungen 23 105-115	1976	293

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Eglestonite'
loop_
_publ_author_name
'Mereiter K'
'Zemann J'
'Hewat A W'
_journal_name_full 'American Mineralogist'
_journal_volume 77 
_journal_year 1992
_journal_page_first 839
_journal_page_last 842
_publ_section_title
;
 Eglestonite, (Hg2)3Cl3O2H: confirmation of the chemical formula by neutron
 powder diffraction
 sample SN examined by powder neutron diffraction
;
_database_code_amcsd 0001530
_chemical_formula_sum 'Hg6 Cl3 O2 H'
_cell_length_a 16.036
_cell_length_b 16.036
_cell_length_c 16.036
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 4123.709
_exptl_crystal_density_diffrn      8.652
_symmetry_space_group_name_H-M 'I a -3 d'
loop_
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  '3/4+z,3/4-y,1/4+x'
  '1/4+z,1/4-y,3/4+x'
  '3/4-y,3/4+x,1/4-z'
  '1/4-y,1/4+x,3/4-z'
  '3/4+x,3/4-z,1/4+y'
  '1/4+x,1/4-z,3/4+y'
  '3/4-z,3/4+y,1/4-x'
  '1/4-z,1/4+y,3/4-x'
  '3/4+y,3/4-x,1/4+z'
  '1/4+y,1/4-x,3/4+z'
  '1/4-x,3/4-z,3/4+y'
  '3/4-x,1/4-z,1/4+y'
  '1/4+z,3/4+y,3/4-x'
  '3/4+z,1/4+y,1/4-x'
  '1/4-y,3/4-x,3/4+z'
  '3/4-y,1/4-x,1/4+z'
  '1/4+x,3/4+z,3/4-y'
  '3/4+x,1/4+z,1/4-y'
  '1/4-z,3/4-y,3/4+x'
  '3/4-z,1/4-y,1/4+x'
  '1/4+y,3/4+x,3/4-z'
  '3/4+y,1/4+x,1/4-z'
  '-z,-x,-y'
  '1/2-z,1/2-x,1/2-y'
  'y,z,x'
  '1/2+y,1/2+z,1/2+x'
  '-x,-y,-z'
  '1/2-x,1/2-y,1/2-z'
  'z,x,y'
  '1/2+z,1/2+x,1/2+y'
  '-y,-z,-x'
  '1/2-y,1/2-z,1/2-x'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_U_iso_or_equiv
Hg   0.17229   0.01331   0.00910   1.00000 ?
Cl   0.12500   0.36352   0.88648   1.00000   0.01900
O   0.04490   0.04490   0.04490   1.00000   0.01418
H   0.00690   0.00690   0.00690   0.50000   0.02064
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
Hg 0.01133 0.03830 0.03309 -0.00026 0.00013 0.00065

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
3.273 Å	(100)
1.890 Å	(57)
2.536 Å	(47)
4.009 Å	(36)
1.709 Å	(14)
2.315 Å	(11)
1.336 Å	(9)

Geological EnvironmentHide

Paragenetic Mode(s):

Paragenetic Mode	Earliest Age (Ga)
Stage 7: Great Oxidation Event	<2.4
47a : [Near-surface hydration of prior minerals]
47g : [Halogen-bearing surface weathering minerals]

Type Occurrence of EglestoniteHide

Type Locality:

ⓘ Terlingua Mining District, Texas, USA

General Appearance of Type Material:

Dodecahedral crystals, < 1 mm, isolated or in a loose crust.

Place of Conservation of Type Material:

National Museum of Natural History, Washington, D.C., USA, R1325.

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

Dutch:Eglestoniet

German:Eglestonit

Russian:Эглестонит

Simplified Chinese:褐氯汞矿

Spanish:Eglestonita

Traditional Chinese:褐氯汞礦

Relationship of Eglestonite to other SpeciesHide

Forms a series with:

Kadyrelite

Eglestonite-Kadyrelite Series

Common AssociatesHide

Associations Based on Photo Data:

39 photos of Eglestonite associated with Calomel	[Hg₂]²⁺Cl₂
30 photos of Eglestonite associated with Cinnabar	HgS
29 photos of Eglestonite associated with Native Mercury	Hg
15 photos of Eglestonite associated with Quartz	SiO₂
11 photos of Eglestonite associated with Edgarbaileyite	[Hg₂]²⁺₃[Si₂O₇]
7 photos of Eglestonite associated with Calcite	CaCO₃
6 photos of Eglestonite associated with Montroydite	HgO
4 photos of Eglestonite associated with Rosasite	(Cu,Zn)₂(CO₃)(OH)₂
4 photos of Eglestonite associated with Wattersite	[Hg₂]²⁺₂Hg²⁺[CrO₄]O₂
4 photos of Eglestonite associated with Terlinguaite	[Hg₃]⁴⁺Hg²⁺Cl₂O₂

Related Minerals - Strunz-mindat Grouping Hide

3.DD.	Mikecoxite	[CHg₄]OCl₂	Mon. 2/m
3.DD.05	Kadyrelite	[Hg₂]²⁺₃OBr₃(OH)	Iso. m3m(4/m32/m) : Ia3d
3.DD.10	Poyarkovite	[Hg₂]²⁺₃Cl₂O₂	Mon. 2/m : B2/b
3.DD.15	Hanawaltite	[Hg₂]²⁺₃Hg²⁺(Cl,OH)₂O₃	Orth. mmm(2/m2/m2/m)
3.DD.20	Terlinguaite	[Hg₃]⁴⁺Hg²⁺Cl₂O₂	Mon. 2/m : B2/m
3.DD.25	Pinchite	Hg²⁺₅Cl₂O₄	Orth. mmm(2/m2/m2/m) : Ibam
3.DD.30	Gianellaite	[(Hg₂N)₂](SO₄)(H₂O)_x	Iso. 43m : F43m
3.DD.30	Mosesite	(Hg₂N)(Cl,SO₄,MoO₄) · H₂O	Iso. 43m : F43m
3.DD.35	Kleinite	(Hg₂N)(Cl,SO₄) · nH₂O	Hex. 6/mmm(6/m2/m2/m) : P6₃/mmc
3.DD.40	Tedhadleyite	[Hg₂]²⁺₅Hg²⁺I₂(Cl,Br)₂O₄	Tric. 1
3.DD.45	Vasilyevite	[Hg₂]²⁺₁₀I₃Br₂Cl[CO₃]O₆	Tric. 1 : P1
3.DD.50	Aurivilliusite	[Hg₂]²⁺Hg²⁺₂(I,Br,Cl)₂O₂	Mon. 2/m : B2/b
3.DD.55	Terlinguacreekite	Hg²⁺₃Cl₂O₂	Orth.
3.DD.60	Kelyanite	[Hg]²⁺₆Sb³⁺BrCl₂O₆	Trig. 3 : P3
3.DD.65	Comancheite	Hg²⁺₅₅N^3-₂₄(NH₂,OH)₄(Cl,Br)₃₄	Orth.
3.DD.70	Gaildunningite	Hg²⁺₃[NHg²⁺₂]₁₈(Cl,I,OH,Br,S)₂₄	Orth. mmm(2/m2/m2/m)

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.

Internet Links for EglestoniteHide

mindat.org URL:

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

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External Links:

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Raman and XRD data at RRUFF project

References and PDF downloads at RRUFF project

American Mineralogist Crystal Structure Database

Handbook of Mineralogy page PDF

Mineral Dealers:

Buy from D. Joyce minerals

References for EglestoniteHide

Reference List:

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 (1). 3-13 doi:10.1524/zkri.1904.39.1.3

Hillebrand, W.F.; Schaller, W.T. (1909) The mercury minerals from Terlingua, Texas. Bulletin 405. US Geological Survey p.1-174. doi:10.3133/b405 p.143

Rogers, A.F. (1911) Eglestonite from San Mateo County, California. American Journal of Science: 32(187): 48-50.

Bird, Paul H. (1932) A new occurrence and x-ray study of mosesite. American Mineralogist, 17 (12) 541-550

Hedlik, A. (1948) Über die Formel und Struktur von Eglestonit Hg4Cl2O. Experientia, Basel: 4: 66.

Hedlik, Anna (1950) Über Formel und Struktur des Mercurooxychlorides Eglestonit. Tschermaks Mineralogische und Petrographische Mitteilungen, 1 (4) 378-389 doi:10.1007/bf01145393

Palache, Charles; Berman, Harry; Frondel, Clifford (1951) The System of Mineralogy (7th ed.) Vol. 2 - Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. John Wiley and Sons.pp.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. TMPM Tschermaks Mineralogische und Petrographische Mitteilungen, 23 (2). 105-115 doi:10.1007/bf01081478

Fleischer, Michael, Jambor, John (1977) New mineral names. American Mineralogist, 62 (3-4).

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, Kurt, Zemann, Josef, Hewat, Alan W. (1992) Eglestonite, [Hg2]3Cl3O2H: Confirmation of the chemical formula by neutron powder diffraction. American Mineralogist, 77 (7-8) 839-842

(2005) Eglestonite. Handbook of Mineralogy. Mineralogical Society of America

Localities for EglestoniteHide

Showing 41 localities.

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.

Hide all sections | Show all sections

Locality ListHide

- This locality has map coordinates listed.

- This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.


Germany
Rhineland-Palatinate Donnersbergkreis Kirchheimbolanden Mörsfeld ⓘ Daimbacher Hof	Heidtke (2001)
Nordpfälzer Land Obermoschel ⓘ Landsberg	Heidtke (2001)
ⓘ Backofen Mine	Stephan Wolfsried collection
ⓘ Carolina Mine	Dreyer (1975)
ⓘ Vertrauen zu Gott Mine	Hartmut Hensel Collection
Stahlberg ⓘ Frischer Mut Mine (Frischemuth Mine)	Heidtke (2001)

Hungary
Borsod-Abaúj-Zemplén County Kazincbarcika District Rudabánya ⓘ Adolf Mine	Szakáll

Kyrgyzstan
Batken Region Kadamjay District Aydarken ⓘ Khaidarkan Sb-Hg deposit	Vasil'yev et al. (1982) +2 other references
ⓘ Chauvai (Chauvay) Sb-Hg Deposit	Kolesar et al. (1993)

Mexico
Guerrero Taxco de Alarcón ⓘ Huahuaxtla	Gallagher et al. (1948)
ⓘ San Luis Mine	Panczner (1987)
San Luis Potosí Moctezuma Municipality Moctezuma Hacienda de Santa Antonio de Rul ⓘ Dulces Nombres Mine	Percy Babb (1909) +1 other reference
Zacatecas Fresnillo Municipality ⓘ San Onofre	Desor (12/2017)

Russia
Buryatia Baunt District North-Muya Range Middle Kelyana River ⓘ Kelyana Hg Deposit	Vasil'yev et al. (1983) +1 other reference
Tuva Pi-Khem District Uyuk Range ⓘ Arzak Hg occurrence (Arzakskoye)	Canadian Mineralogist Feb. 1999 +2 other references
Oorash-Khem River Valley ⓘ Kadyrel' Hg occurrence	Pekov (1998) +1 other reference

South Africa
Limpopo Mopani District Municipality Ba-Phalaborwa Local Municipality Murchison Range Gravelotte Monarch Cinnabar mine ⓘ Monarch Kop lode	Palache et al. (1951) +1 other reference

Spain
Andalusia Almería Huércal-Overa Cuesta Alta Cerro Minado Mines ⓘ La Cena del Depósito concession	Favreau et al. (2013)
Castile-La Mancha Ciudad Real Almadenejos ⓘ El Entredicho Mine	Sainz de Baranda Graf et al. (2019)
Extremadura Badajoz Usagre ⓘ Mariquita Mine (Sultana Mine)	Calvo Rebollar et al. (2022) +1 other reference

USA
Arizona Gila County ⓘ Sunflower Mining District (Mazatzal Mountains Mining District; Mazatzal Mountains Quicksilver Mining District)	Anthony et al. (1995)
Arkansas Howard County ⓘ Southwest Arkansas Mercury Mining District	- (2005)
ⓘ Mercury District of Southwest Arkansas	- (2005)
Pike County ⓘ Funderburk prospect	Roberts et al. (2003)
ⓘ Mercury District of Southwest Arkansas	- (2005)
California Kings County ⓘ Kings Mine	Bailey (1942) +2 other references
San Benito County Goat Mountain ⓘ Clear Creek claim	Dunning +1 other reference
San Mateo County Palo Alto area ⓘ Unnamed Hg occurrence [1]
ⓘ Unnamed Hg occurrence [2]	Rogers (1911) +2 other references
Portola Valley El Corte de Madera Rancho ⓘ Unnamed Hg occurrence [4]	Rogers (1911) +1 other reference
Redwood City ⓘ Challenge deposit	Rogers (1911) +3 other references
ⓘ Farm Hill No. 2 Mine (Emerald Lake Mine; Upper Emerald Lake deposit; Farm Hill Cinnabar property)	Davis (1955) +3 other references
ⓘ Unnamed Hg occurrence [3]	Woodhouse (1934) +1 other reference
Sonoma County West Mayacmas Mining District Castle Rock Springs area ⓘ Socrates Mine	Pemberton (1983) +2 other references
Nevada Humboldt County Opalite Mining District ⓘ McDermitt Mine	Rocks & Minerals. Nov. 1999. +1 other reference
Poverty Peak Mining District ⓘ Cahill Mine	Castor et al. (2004)
ⓘ Snowdrift Mine	Castor et al. (2004)
Lander County Warm Springs Mining District ⓘ Warm springs mine (Lime Cap mine; Mercury mine) ?	Stewart et al. (1977)
Texas Brewster County ⓘ Margaret D lode (Maggie D lode)	Smith (1991)
ⓘ Mariposa Mine	Smith (1991)
ⓘ Terlingua Mining District (TL)	Palache et al. (1951) +1 other reference

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Eglestonite

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