Calomel Mineral Data

General Calomel Information

Chemical Formula:

Hg2Cl2

Composition:

Molecular Weight = 472.09 gm

Mercury 84.98 % Hg 88.37 % Hg₂O

Chlorine 15.02 % Cl 15.02 % Cl

- % Cl -3.39 % -O=Cl₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Hg₂Cl₂

Environment:

Oxidized mercury deposits.

IMA Status:

Valid Species (Pre-IMA) 1776

Locality:

Terlingua, Brewster Co., Texas, USA. Link to MinDat.org Location Data.

Name Origin:

From the Greek, kalos - "beautiful" and melas - "black."

Name Pronunciation:

Calomel

Synonym:

Horn Quicksilver

ICSD 64683

PDF 26-312

Calomel Image

Images:

Calomel

Comments: A grayish aggregate of calomel on a rufous matrix.
Location: Landsberg (Moschellandsberg), Obermoschel, Palatinate, Rhineland-Palatinate, Germany. Scale: Picture size 3 mm.
© Thomas Witzke / Abraxas-Verlag

Calomel Crystallography

Axial Ratios:

a:c = 1:2.44719

Cell Dimensions:

a = 4.45, c = 10.89, Z = 2; V = 215.65 Den(Calc)= 7.27

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: I 4/mmm

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

By Intensity(I/I_o): 3.164(1), 4.141(0.97), 1.97(0.38),

Forms:

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Forms: ( 0 1 3) ( 0 1 1) ( 1 1 0) ( 1 1 2) ( 0 0 1)

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Crystal Structure:

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Calos N J , Kennard C H L , Davis R L , Zeitschrift fur Kristallographie , 187 (1989) p.305-307, The structure of calomel, Hg2Cl2, derived from neutron powder data

View Additional jPOWD Structure files for Calomel
[1]

Physical Properties of Calomel

Cleavage:

{100} Poor, {011} Poor

Color:

White, Yellowish gray, Gray, Yellowish white, Brown.

Density:

6.4 - 6.5, Average = 6.45

Diaphaneity:

Translucent to subtranslucent

Fracture:

Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).

Habit:

Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

1.5-2 - Talc-Gypsum

Luminescence:

Fluorescent, Short UV=dark red, Long UV=dark red.

Luster:

Adamantine - Resinous

Streak:

pale yellowish white

Optical Properties of Calomel

Dichroism (e):

colorless.

Dichroism (w):

colorless.

Gladstone-Dale:

CI meas= -0.162 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.031 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1802,KPDmeas= 0.2031,KC= 0.1747
Ncalc = 2.12 - 2.27

Optical Data:

Uniaxial (+), w=1.97, e=2.65, bire=0.6800.

Calculated Properties of Calomel

Electron Density:

Bulk Density (Electron Density)=5.98 gm/cc
note: Specific Gravity of Calomel =7.27 gm/cc.

Fermion Index:

Fermion Index = 0.25
Boson Index = 0.75

Photoelectric:

PE_Calomel=1,464.64 barns/electron
U=PE_Calomel x rElectron Density=8,751.40 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Calomel is Not Radioactive

Calomel Classification

Dana Class:

09.01.08.01 (09)Anhydrous and Hydrated Halides

(09.01)where A X

(09.01.08)Calomel Group

09.01.08.01 Calomel Hg2Cl2 I 4/mmm 4/m 2/m 2/m

09.01.08.02 Kuzminite Hg2(Br,Cl)2 I 4/mmm 4/m 2/m 2/m

09.01.08.03 Moschelite Hg2I2 I 4/mmm 4/m 2/m 2/m

Strunz Class:

03.AA.30 03 - HALIDES

03.A - Simple Halides, Without H2O

03.AA -M:X = 1:1, 2:3, 3:5, etc.

03.AA.30 Calomel Hg2Cl2 I 4/mmm 4/m 2/m 2/m

03.AA.30 Kuzminite Hg2(Br,Cl)2 I 4/mmm 4/m 2/m 2/m

03.AA.30 Moschelite Hg2I2 I 4/mmm 4/m 2/m 2/m

Other Calomel Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

See Also:

Links to other databases for Calomel :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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Ask about Calomel here :
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Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Calomel Specimen Label here :

Calomel

Hg2Cl2
Dana No: 09.01.08.01 Strunz No: 03.AA.30
Locality:

Notes: