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 - HexoctahedralH-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:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize
Keyboard
S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu
Help on Above

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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:

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

Search for Eglestonite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Eglestonite :

A Bijoux Google Search for Eglestonite
Adam's Minerals Google Search for Eglestonite
Cape Minerals Google Search for Eglestonite
Dakota Matrix Minerals Google Search for Eglestonite
Excalibur Mineral Corp. Google Search for Eglestonite
Exceptional Minerals Google Search for Eglestonite
John Betts Fine Minerals Search for Eglestonite
McDougall Minerals Google Search for Eglestonite
Mineral News Website Link
Rock and Mineral Shows Google Search for Eglestonite
Weinrich Minerals, Inc. Google Search for Eglestonite

Ask about Eglestonite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: