Eglestonite Mineral Data (original) (raw)
General Eglestonite Information
Chemical Formula:
Hg6Cl3O(OH) (?)
Composition:
Molecular Weight = 1,342.90 gm
Mercury 89.62 % Hg 93.20 % Hg2O
Hydrogen 0.08 % H 0.67 % H2O
Chlorine 7.92 % Cl 7.92 % Cl
Oxygen 2.38 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Hg6Cl3O(OH)
Environment:
Secondary mineral associated with mercury deposits
IMA Status:
Valid Species (Pre-IMA) 1903
Locality:
Terlingua district, Brewster County, Texas, USA Link to MinDat.org Location Data.
Name Origin:
Named for T. E. Egleston.
Name Pronunciation:
Eglestonite + Pronunciation 
Synonym:
ICSD 12102
PDF 29-909
Eglestonite Image
Images:
 |
Eglestonite Comments: Small yellow crystals and massive aggregates of eglestonite. Location: Landsberg (Moschellandsberg), Obermoschel, Palatinate, Rhineland-Palatinate, Germany.Scale: Picture size 0.8 mm. © Thomas Witzke / Abraxas-Verlag |
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Eglestonite Crystallography
Cell Dimensions:
a = 16.036, Z = 16; V = 4,123.71 Den(Calc)= 8.65
Crystal System:
Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: I a3d
X Ray Diffraction:
By Intensity(I/Io): 1.89(1), 3.28(0.9), 2.54(0.6),
Forms:
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| | Forms:( 1 1 1) ( 1 1 2) ( 2 3 3) ( 0 1 1) Warning: this large pop-up is very compute intensive and may not work well with some computers. | | ---------------------------------------------------------------------------------------------------------------------------------------------------------------- |
Crystal Structure:
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| | Mereiter K , Zemann J , Hewat A W , American Mineralogist , 77 (1992) p.839-842, Eglestonite, [Hg2]3Cl3O2H: Confirmation of the chemical formula by neutron, powder diffraction, sample SX examined by single-crystal X-ray diffraction View Additional jPOWD Structure files for Eglestonite [1] [2] | | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
Physical Properties of Eglestonite
Cleavage:
None
Color:
Brown, Brownish yellow, Yellow, Dark brown, Orange.
Density:
8.3
Diaphaneity:
Transparent to translucent
Fracture:
Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Hardness:
2-3 - Gypsum-Calcite
Luminescence:
Non-fluorescent.
Luster:
Adamantine - Resinous
Magnetism:
Nonmagnetic
Streak:
light yellow
Optical Properties of Eglestonite
Gladstone-Dale:
CI meas= -0.111 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.067 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1723,KPDmeas= 0.1795,KC= 0.1615
Ncalc = 2.34 - 2.4
Optical Data:
Isotropic, n=2.49.
Calculated Properties of Eglestonite
Electron Density:
Bulk Density (Electron Density)=7.06 gm/cc
note: Specific Gravity of Eglestonite =8.65 gm/cc.
Fermion Index:
Fermion Index = 0.27
Boson Index = 0.73
Photoelectric:
PEEglestonite =1,554.90 barns/electron
U=PEEglestonite x rElectron Density=10977.02 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Eglestonite is Not Radioactive
Eglestonite Classification
Dana Class:
10.05.04.01 (10)Oxyhalides and Hydroxyhalides
(10.05)where Am (O,OH)p Xq
(10.05.04)Dana Group
10.05.04.01 Eglestonite Hg6Cl3O(OH)(?) I a3d 4/m 3 2/m
10.05.04.02 Kadyrelite Hg4(Br,Cl)2O I a3d 4/m 3 2/m
Strunz Class:
03.DD.05 03 - HALIDES
03.D - Oxyhalides, Hydroxyhalides and Related Double Halides
03.DD -With Hg
03.DD.05 Eglestonite Hg6Cl3O(OH)(?) I a3d 4/m 3 2/m
03.DD.05 Kadyrelite Hg4(Br,Cl)2O I a3d 4/m 3 2/m
Other Eglestonite Information
References:
PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
See Also:
Links to other databases for Eglestonite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST
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Ask about Eglestonite here :
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Print or Cut-and-Paste your Eglestonite Specimen Label here :
Eglestonite
Hg6Cl3O(OH) (?)
Dana No: 10.05.04.01 Strunz No: 03.DD.05
Locality:
Notes: