Mineralogy Database

Calomel Mineral Data

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General Calomel Information

Help on Chemical  Formula: Chemical Formula: Hg2Cl2
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Hg2Cl2
Help on Environment: Environment: Oxidized mercury deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1776
Help on Locality: Locality: Terlingua, Brewster Co., Texas, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek, kalos - "beautiful" and melas - "black."
Help on Name Pronunciation: Name Pronunciation: Calomel Say CALOMEL
Help on Synonym: Synonym: Horn Quicksilver
  ICSD 64683
  PDF 26-312

Calomel Image

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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

Help on Axial Ratios: Axial Ratios: a:c = 1:2.44719
Help on Cell Dimensions: Cell Dimensions: a = 4.45, c = 10.89, Z = 2; V = 215.65 Den(Calc)= 7.27
Help on Crystal System: Crystal System: Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: I 4/mmm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.164(1), 4.141(0.97), 1.97(0.38),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

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

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Physical Properties of Calomel

Help on Cleavage: Cleavage: {100} Poor, {011} Poor
Help on Color: Color: White, Yellowish gray, Gray, Yellowish white, Brown.
Help on Density: Density: 6.4 - 6.5, Average = 6.45
Help on Diaphaneity: Diaphaneity: Translucent to subtranslucent
Help on Fracture: Fracture: Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).
Help on Habit: Habit: Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 1.5-2 - Talc-Gypsum
Help on Luminescence: Luminescence: Fluorescent, Short UV=dark red, Long UV=dark red.
Help on Luster: Luster: Adamantine - Resinous
Help on Streak: Streak: pale yellowish white

Optical Properties of Calomel

Help on Dichroism (e): Dichroism (e): colorless.
Help on Dichroism (w): Dichroism (w): colorless.
Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Uniaxial (+), w=1.97, e=2.65, bire=0.6800.

Calculated Properties of Calomel

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.98 gm/cc
note: Specific Gravity of Calomel =7.27 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.25
Boson Index = 0.75
Help on Photoelectric: Photoelectric: PECalomel =1,464.64 barns/electron
U=PECalomel x rElectron Density=8,751.40 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Calomel is Not Radioactive

Calomel Classification

Help on  Dana Class: Dana Class: (09)Anhydrous and Hydrated Halides
  (09.01)where A X
  (09.01.08)Calomel Group Calomel Hg2Cl2 I 4/mmm 4/m 2/m 2/m Kuzminite Hg2(Br,Cl)2 I 4/mmm 4/m 2/m 2/m Moschelite Hg2I2 I 4/mmm 4/m 2/m 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: 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

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Dana No: Strunz No: 03.AA.30





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