Mineralogy Database

Cotunnite Mineral Data

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General Cotunnite Information

Help on Chemical  Formula: Chemical Formula: PbCl2
Help on Composition: Composition: Molecular Weight = 278.11 gm
   Lead      74.50 %  Pb   80.26 % PbO
   Chlorine  25.50 %  Cl   25.50 % Cl
               -   %   Cl   -5.75 % -O=Cl2   
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: PbCl2
Help on Environment: Environment: Oxidized lead deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1825
Help on Locality: Locality: Vesuvius, Italy. Tarapaca, Chile. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Domenico Cotugno (Cotunnius) (1736-1822), Italian physician and Professor of Anatomy, University of Naples, Naples, Italy.
Help on Synonym: Synonym: ICSD 27736
  PDF 26-1150

Cotunnite Image

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Comments: White to tan translucent crystalline cotunnite on volcanic slag.
Location: Vesuvius, Campania, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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  Burnsite   Cotunnite

Comments: Images of burnsite grains (dark) in intimate intergrowth with cotunnite (light). Images obtained by scanning electron microscopy.
Location: North Breach of the great fissure Tolbachik volcano eruption (1975-1976), Kamchatka Peninsula, Russia. Scale: Scale bar: 20 µ-m.
© Canadian Mineralogist

Cotunnite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.8427:1:0.5013
Help on Cell Dimensions: Cell Dimensions: a = 7.6222, b = 9.0448, c = 4.5348, Z = 4; V = 312.63 Den(Calc)= 5.91
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pnam
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.581(1), 3.89(0.73), 2.778(0.56),
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: ( 1 2 0) ( 0 1 0) ( 0 1 1) ( 1 1 1) ( 1 1 0) ( 1 0 0)

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Physical Properties of Cotunnite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Colorless, Green, Yellow, White.
Help on Density: Density: 5.3 - 5.8, Average = 5.55
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Hardness: Hardness: 1.5-2 - Talc-Gypsum
Help on Luster: Luster: Adamantine
Help on Streak: Streak: white

Optical Properties of Cotunnite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.179 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.107 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2073,KPDmeas= 0.2208,KC= 0.1873
Ncalc = 1.99 - 2.11
Help on Optical Data: Optical Data: Biaxial (+), a=2.199, b=2.217, g=2.26, bire=0.0610, 2V(Calc)=68, 2V(Meas)=67.2.

Calculated Properties of Cotunnite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.93 gm/cc
note: Specific Gravity of Cotunnite =5.91 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.16
Boson Index = 0.84
Help on Photoelectric: Photoelectric: PECotunnite =1,372.93 barns/electron
U=PECotunnite x rElectron Density=6,768.86 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Cotunnite is Not Radioactive

Cotunnite Classification

Help on  Dana Class: Dana Class: (09)Anhydrous and Hydrated Halides
  (09.02)where A (X)2
  (09.02.07)Cotunnite Group Cotunnite PbCl2 Pnam 2/m 2/m 2/m Hydrophilite? CaCl2 Pnnm 2/m 2/m 2/m Coccinite! HgI2(?) P 41/nmc 4/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 03.DC.85 03 - HALIDES
  03.D - Oxyhalides, Hydroxyhalides and Related Double Halides
  03.DC -With Pb (As,Sb,Bi), without Cu
03.DC.85 Cotunnite PbCl2 Pnam 2/m 2/m 2/m

Other Cotunnite Information

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Cotunnite :
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

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Dana No: Strunz No: 03.DC.85





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