Calomel Mineral Data

Calomel Mineral Data +

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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."

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

Diaphaniety:

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.

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

Optical Data:

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

Calculated Properties of Calomel

Electron Density:

r_electron=5.98 gm/cc
note: r_Calomel=7.27 gm/cc.

Fermion Index

Fermion Index = 0.25664
Boson Index = 0.74336

Photoelectric:

PE_Calomel=1,464.64 barns/electron
U=PE_Calomel x r_electron=8,751.39 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Calomel is Not Radioactive

Calomel Classification

Dana Class:

9.1.8.1 (9)Anhydrous and Hydrated Halides

(9.1)where A X

(9.1.8)Dana Group

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

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

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

Strunz Class:

III/A.05-10 III - Halogenides

III/A - Simple halogenides, without water Metal : Halogen = 1 : 1

III/A.05 - Calomel - Moschelite series

III/A.05-10 Calomel Hg2Cl2 I 4/mmm 4/m 2/m 2/m

III/A.05-20 Kuzminite Hg2(Br,Cl)2 I 4/mmm 4/m 2/m 2/m

III/A.05-30 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)

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Calomel

Hg2Cl2
Dana No: 9.1.8.1 Strunz No: III/A.05-10
Locality:

Notes: