Eglestonite Mineral Data

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

- % Cl -1.79 % -O=Cl₂

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

Eglestonite Crystallography

Cell Dimensions:

a = 16.036, Z = 16; V = 4,123.71 Den(Calc)= 8.65

Crystal System:

Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: I a3d

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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)

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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:

PE_Eglestonite=1,554.90 barns/electron
U=PE_Eglestonite 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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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:

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