Edgarbaileyite
A valid IMA mineral species
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About Edgarbaileyite
Edgar H. Bailey
Formula:
[Hg2]2+3[Si2O7]
Colour:
Freshly exposed material is lemon-yellow to orangish yellow; exposed surfaces range from dark olive-green to a lighter yellowish green to dark green-brown
Lustre:
Vitreous, Resinous
Hardness:
4
Specific Gravity:
9.4
Crystal System:
Monoclinic
Name:
Named in 1990 by Andrew C. Roberts, Maurizio Bonardi, Richard C. Erd, Alan J. Criddle, Christopher J. Stanley, Gordon Cressy, Ross J. Angel, and J. H. Gilles LaFlamme in honor of Edgar Herbert Bailey [August 3, 1914 Washington, District of Columbia, USA - July 28, 1983 San Mateo, California, USA], geologist for the United States Geological Survey and a mercury commodity specialist.
Unique Identifiers
Mindat ID:
1352
Long-form identifier:
mindat:1:1:1352:5
IMA Classification of Edgarbaileyite
Approved
IMA Formula:
Hg1+6Si2O7
Approval year:
1988
First published:
1990
Classification of Edgarbaileyite
9.BC.25
9 : SILICATES (Germanates)
B : Sorosilicates
C : Si2O7 groups, without non-tetrahedral anions; cations in octahedral [6] and greater coordination
9 : SILICATES (Germanates)
B : Sorosilicates
C : Si2O7 groups, without non-tetrahedral anions; cations in octahedral [6] and greater coordination
55.5.1.1
55 : SOROSILICATES Si2O7 Groups,Generally with no Additional Anions
5 : Si2O7 Groups, Generally with No Additional Anions with dimeric cations
55 : SOROSILICATES Si2O7 Groups,Generally with no Additional Anions
5 : Si2O7 Groups, Generally with No Additional Anions with dimeric cations
14.11.6
14 : Silicates not Containing Aluminum
11 : Silicates of Th and Hg
14 : Silicates not Containing Aluminum
11 : Silicates of Th and Hg
Mineral Symbols
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 |
|---|---|---|
| Ebl | 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 Edgarbaileyite
Vitreous, Resinous
Transparency:
Translucent, Opaque
Colour:
Freshly exposed material is lemon-yellow to orangish yellow; exposed surfaces range from dark olive-green to a lighter yellowish green to dark green-brown
Streak:
Pale green with a yellow tinge
Hardness:
4 on Mohs scale
Hardness:
VHN100=153 - 217 kg/mm2 - Vickers
Tenacity:
Brittle
Fracture:
Sub-Conchoidal
Density:
9.4(3) g/cm3 (Measured) 9.11 g/cm3 (Calculated)
Optical Data of Edgarbaileyite
Type:
Biaxial
RI values:
nα = 2.10 nγ = 2.58
Max. Birefringence:
δ = 0.480
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Bireflectance:
Weak to strong
Dispersion:
strong
Colour in reflected light:
gray to slightly lighter gray,
Internal Reflections:
pale lemon-yellow
Pleochroism:
Weak
Comments:
In polished section, not pleochroic
Chemistry of Edgarbaileyite
Mindat Formula:
[Hg2]2+3[Si2O7]
Elements listed:
Crystallography of Edgarbaileyite
Crystal System:
Monoclinic
Cell Parameters:
a = 11.72 Å, b = 7.69 Å, c = 5.96 Å
β = 112.07°
β = 112.07°
Ratio:
a:b:c = 1.524 : 1 : 0.775
Unit Cell V:
497.80 ų (Calculated from Unit Cell)
Z:
2
Twinning:
Polysynthetically twinned on {100}
Comment:
Point Group: 2/m; m; or 2:;: Space Group: C2/m; Cm; or C2: a
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0001331 | Edgarbaileyite | Angel R J, Cressey G, Criddle A J (1990) Edgarbaileyite, Hg6Si2O7: The crystal structure of the first mercury silicate American Mineralogist 75 1192-1196 |  | 1990 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.160 Å | (100) |
| 2.715 Å | (63) |
| 1.872 Å | (36) |
| 2.952 Å | (34) |
| 3.027 Å | (27) |
| 2.321 Å | (24) |
| 6.28 Å | (20) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) | |
| Stage 7: Great Oxidation Event | <2.4 |
| 47h : [Near-surface oxidized, dehydrated minerals] |
Type Occurrence of Edgarbaileyite
General Appearance of Type Material:
Thin crusts on fracture surfaces; disseminated rounded to mammillary masses; hollow mammillary nodules.
Place of Conservation of Type Material:
Holotype specimen, (broken into two hand specimens, several mineral fragments, two polished grain mounts and two SEM stubs), Systematic Reference Series, National Mineral Collection, Geological Survey of Canada, Ottawa, catalog NMC 65531.
Hand specimen
Hand specimen
Associated Minerals at Type Locality:
Synonyms of Edgarbaileyite
Other Language Names for Edgarbaileyite
Dutch:Edgarbaileyiet
German:Edgarbaileyit
Russian:Эдгарбейлиит
Simplified Chinese:硅汞石
Spanish:Edgarbaileyita
Traditional Chinese:矽汞石
Common Associates
Associations Based on Photo Data:
| 36 photos of Edgarbaileyite associated with Cinnabar | HgS |
| 23 photos of Edgarbaileyite associated with Native Mercury | Hg |
| 21 photos of Edgarbaileyite associated with Montroydite | HgO |
| 21 photos of Edgarbaileyite associated with Quartz | SiO2 |
| 11 photos of Edgarbaileyite associated with Eglestonite | [Hg2]2+3OCl3(OH) |
| 5 photos of Edgarbaileyite associated with Wattersite | [Hg2]2+2Hg2+[CrO4]O2 |
| 3 photos of Edgarbaileyite associated with Opal | SiO2 · nH2O |
| 2 photos of Edgarbaileyite associated with 'CCUK-13' | Hg-Si-O |
| 2 photos of Edgarbaileyite associated with 'Chalcedony' | SiO2 |
| 1 photo of Edgarbaileyite associated with 'CCUK-8' | (Hg, CrO4, S, H2O)? |
Related Minerals - Strunz-mindat Grouping
| 9.BC. | Anorthoyttrialite-(Y) | Y4(SiO4)(Si3O10) |
| 9.BC. | Kozłowskiite | Ca4(Fe2+Sn3)[Si2O7]2[Si2O6OH]2 |
| 9.BC.05 | Yttrialite-(Y) | (Y,Th)2Si2O7 |
| 9.BC.05 | Thortveitite | Sc2Si2O7 |
| 9.BC.05 | Keiviite-(Y) | Y2Si2O7 |
| 9.BC.05 | Keiviite-(Yb) | Yb2Si2O7 |
| 9.BC.05 | Gittinsite | CaZrSi2O7 |
| 9.BC.10 | Parakeldyshite | Na2ZrSi2O7 |
| 9.BC.10 | Keldyshite | (Na,H)2ZrSi2O7 |
| 9.BC.10 | Khibinskite | K2ZrSi2O7 |
| 9.BC.10 | Brunovskyite | NaZrSi2O6(OH) |
| 9.BC.15 | Rankinite | Ca3Si2O7 |
| 9.BC.20 | Barysilite | Pb8Mn2+[Si2O7]3 |
| 9.BC.30 | Kristiansenite | Ca4(Sc2Sn2)[Si2O7]2[Si2O6OH]2 |
| 9.BC.30 | Nybergite | Ca4Sc3Sn(Si2O7)(Si2O6OH)3 |
| 9.BC.30 | Silesiaite | Ca4(Fe3+2Sn2)[Si2O7]2[Si2O6OH]2 |
| 9.BC.35 | Percleveite-(Ce) | Ce2Si2O7 |
| 9.BC.35 | Percleveite-(La) | La2Si2O7 |
| 9.BC.40 | Scottyite | BaCu2Si2O7 |
Fluorescence of Edgarbaileyite
Nonfluorescent
Other Information
Notes:
Photosensitive
Special Storage/
Display Requirements:
Display Requirements:
Photosensitive
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 Edgarbaileyite
mindat.org URL:
https://www.mindat.org/min-1352.html
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Please feel free to link to this page.
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References for Edgarbaileyite
Localities for Edgarbaileyite
Showing 8 localities.
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Spain | |
| Calvo Rebollar et al. (2022) +1 other reference |
USA | |
| Mineral News: 20 (10) |
| Erd et al. (1990) +1 other reference |
| Dunning |
| Mineral. Record |
| Borja Sainz de Baranda Graf Collection |
| Castor et al. (2004) |
| Smith (1991) |
Quick NavTopAbout EdgarbaileyiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesCommon AssociatesStrunz-MindatFluorescence Other InformationInternet Links References Localities Locality List
Clear Creek claim, Goat Mountain, San Benito County, California, USA