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Edgarbaileyite

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About EdgarbaileyiteHide

Edgar H. Bailey
Formula:
(Hg-Hg)3Si2O7
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.
The only approved natural Hg silicate. Compare the two other unnamed (not approved) Hg silicate minerals: CCUK-13 and CCUK-14.


Classification of EdgarbaileyiteHide

Approved
First Published:
1990
9.BC.25

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
14.11.6

14 : Silicates not Containing Aluminum
11 : Silicates of Th and Hg

Physical Properties of EdgarbaileyiteHide

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:
Tenacity:
Brittle
Fracture:
Sub-Conchoidal
Density:
9.4(3) g/cm3 (Measured)    9.11 g/cm3 (Calculated)

Optical Data of EdgarbaileyiteHide

Type:
Biaxial
RI values:
nα = 2.100 nγ = 2.580
Max Birefringence:
δ = 0.480
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Bireflectance:
Weak to strong
Dispersion:
strong
Pleochroism:
Weak
Comments:
In polished section, not pleochroic

Chemical Properties of EdgarbaileyiteHide

Formula:
(Hg-Hg)3Si2O7
IMA Formula:
Hg1+6Si2O7

Crystallography of EdgarbaileyiteHide

Crystal System:
Monoclinic
Cell Parameters:
a = 11.72 Å, b = 7.69 Å, c = 5.96 Å
β = 112.07°
Ratio:
a:b:c = 1.524 : 1 : 0.775
Unit Cell V:
497.80 ų (Calculated from Unit Cell)
Twinning:
Polysynthetically twinned on {100}

Type Occurrence of EdgarbaileyiteHide

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
Reference:
Roberts, A.C., Bonardi, M., Erd, R.C., Criddle, A.J., Stanley, C.J., Cressey, G., Angel, R.J., Laflamme, J.H.G. (1990) Edgarbaileyite the first known silicate of mercury, from California and Texas. The Mineralogical Record: 21: 215-220.

Synonyms of EdgarbaileyiteHide

Other Language Names for EdgarbaileyiteHide

Simplified Chinese:硅汞石
Traditional Chinese:矽汞石

Common AssociatesHide

Associated Minerals Based on Photo Data:
Cinnabar12 photos of Edgarbaileyite associated with Cinnabar on mindat.org.
Wattersite8 photos of Edgarbaileyite associated with Wattersite on mindat.org.
Mercury6 photos of Edgarbaileyite associated with Mercury on mindat.org.
Montroydite5 photos of Edgarbaileyite associated with Montroydite on mindat.org.
Quartz1 photo of Edgarbaileyite associated with Quartz on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.BC.05GittinsiteCaZrSi2O7Mon.
9.BC.05Keiviite-(Y)Y2Si2O7
9.BC.05Keiviite-(Yb)Yb2Si2O7Mon. 2/m : B2/m
9.BC.05ThortveititeSc2Si2O7Mon.
9.BC.05Yttrialite-(Y)(Y,Th)2Si2O7
9.BC.10Keldyshite(Na,H)2ZrSi2O7Tric. 1 : P1
9.BC.10KhibinskiteK2ZrSi2O7Mon.
9.BC.10ParakeldyshiteNa2ZrSi2O7Tric.
9.BC.15RankiniteCa3Si2O7Mon. 2/m : P21/b
9.BC.20BarysilitePb8Mn2+[Si2O7]3Trig.
9.BC.30KristianseniteCa2ScSn(Si2O7)(Si2O6OH)Tric. 1
9.BC.35Percleveite-(Ce)(Ce,La,Nd)2Si2O7Tet. 4

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.11.1ThoriteTh(SiO4)Tet.
14.11.2HuttoniteThSiO4Mon.
14.11.3UmbozeriteNa3Sr4Th[Si(O,OH)3-4]8Amor.
14.11.4Thornasite(Na,K)12Th3[Si8O19]4 · 18H2OTrig. 3m : R3m
14.11.5Yttrialite-(Y)(Y,Th)2Si2O7

Fluorescence of EdgarbaileyiteHide

Nonfluorescent

Other InformationHide

Notes:
Photosensitive
Special Storage/
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.

References for EdgarbaileyiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Roberts, A.C., Bonardi, M., Erd, R.C., Criddle, A.J., Stanley, C.J., Cressey, G., Angel, R.J., Laflamme, J.H.G. (1990) Edgarbaileyite the first known silicate of mercury, from California and Texas. The Mineralogical Record: 21: 215-220.
Jambor, J.L., Burke, E.A.J. (1990) New mineral names. American Mineralogist: 75: 1431-1437.
Angel, R.J., Cressey, G., Criddle, A. (1990) Edgarbaileyite, Hg6Si2O7: The crystal structure of the first mercury silicate. American Mineralogist: 75: 1192-1196.
New Minerals (1997), New Minerals 1990-1994.

Internet Links for EdgarbaileyiteHide

Localities for EdgarbaileyiteHide

ⓘ - 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.
USA
 
  • Arkansas
    • Pike Co.
Mineral News: 20(10): 1, 4-6.
  • California
    • San Benito Co.
      • Diablo Range
        • New Idria District
          • Goat Mountain
Mineralogical Record: 21: 215-220.; Mineralogical Record (1993): 24: 471-475.
    • San Mateo Co.
      • Redwood City
Dunning, Gail, The Challenge Mercury Deposit, Redwood City, San Mateo County, California., BAM Journal, Vol. 9 No. 1.
    • Sonoma Co.
      • Mayacmas Mts (Mayacamas Mts)
        • West Mayacmas District
          • Castle Rock Springs area
Mineral. Record, 21, 215{220.
  • Nevada
    • Pershing Co.
      • Antelope Springs District
NBMG Spec. Pub. 31 Minerals of Nevada
  • Texas
    • Brewster Co.
      • Terlingua District
Rocks & Minerals: 66(1): 202.
Mineral and/or Locality  
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