General Cotunnite Information
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Chemical Formula: |
PbCl2 |
Composition: |
Molecular Weight = 278.11 gm |
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Lead 74.50 % Pb 80.26 % PbO |
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Chlorine 25.50 % Cl 25.50 % Cl |
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- % Cl -5.75 % -O=Cl2 |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
PbCl2 |
Environment: |
Oxidized lead deposits. |
IMA Status: |
Valid Species (Pre-IMA) 1825 |
Locality: |
Vesuvius, Italy. Tarapaca, Chile. Link to MinDat.org Location Data. |
Synonym: |
ICSD 27736 |
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PDF 26-1150 |
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Cotunnite Image |
Images:
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Images:
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Cotunnite Burnsite
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 |
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Cotunnite Crystallography
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Axial Ratios: |
a:b:c =0.8427:1:0.5013 |
Cell Dimensions: |
a = 7.6222, b = 9.0448, c = 4.5348, Z = 4; V = 312.63 Den(Calc)= 5.91 |
Crystal System: |
Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pnam |
X Ray Diffraction: |
By Intensity(I/Io): 3.581(1), 3.89(0.73), 2.778(0.56), |
Forms:
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Forms:
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Crystal Structure:
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Wyckoff R W G , Crystal Structures , 1 (1963) p.298-306, Second edition. Interscience Publishers, New York, New York
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Physical Properties of Cotunnite
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Cleavage: |
[001] Perfect |
Color: |
Colorless, Green, Yellow, White. |
Density: |
5.3 - 5.8, Average = 5.55 |
Diaphaniety: |
Transparent to translucent |
Fracture: |
Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments. |
Habit: |
Acicular - Occurs as needle-like crystals. |
Habit: |
Massive - Granular - Common texture observed in granite and other igneous rock. |
Hardness: |
1.5-2 - Talc-Gypsum |
Luster: |
Adamantine |
Streak: |
white |
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Optical Properties of Cotunnite
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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 |
Optical Data: |
Biaxial (+), a=2.199, b=2.217, g=2.26, bire=0.0610, 2V(Calc)=68, 2V(Meas)=67.2. |
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Calculated Properties of Cotunnite
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Electron Density: |
relectron=4.93 gm/cc note: rCotunnite =5.91 gm/cc. |
Fermion Index |
Fermion Index = 0.16465 Boson Index = 0.83535 |
Photoelectric: |
PECotunnite =1,372.93 barns/electron U=PECotunnite x relectron=6,768.86 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Cotunnite is Not Radioactive |
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Cotunnite Classification
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Dana Class: |
9.2.7.1 (9)Anhydrous and Hydrated Halides |
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(9.2)where A (X)2 |
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(9.2.7)Dana Group |
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9.2.7.1 Cotunnite PbCl2 Pnam 2/m 2/m 2/m |
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9.2.7.2 Hydrophilite CaCl2 Pnnm 2/m 2/m 2/m |
Strunz Class: |
III/D.10-40 III - Halogenides |
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III/D - Oxi-halogenides with Pb - Bi - Sb and related compounds |
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III/D.10 - Cotunnite - Matlockite series |
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III/D.10-10 Fiedlerite Pb3Cl4F(OH)2 P1 1 |
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III/D.10-20 Paralaurionite PbCl(OH) C 2/m 2/m |
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III/D.10-30 Laurionite PbCl(OH) Pnam 2/m 2/m 2/m |
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III/D.10-40 Cotunnite PbCl2 Pnam 2/m 2/m 2/m |
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III/D.10-50 Pseudocotunnite K2PbCl4(?) P nma 2/m 2/m 2/m |
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III/D.10-60 Matlockite PbFCl P 4/nmm 4/m 2/m 2/m |
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III/D.10-65 Rorisite (Ca,Mg)FCl P 4/nmm 4/m 2/m 2/m |
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III/D.10-70 Zavaritskite BiOF P 4/nmm 4/m 2/m 2/m |
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III/D.10-80 Bismoclite BiOCl P 4/nmm 4/m 2/m 2/m |
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III/D.10-90 Daubreeite BiO(OH,Cl) P 4/nmm 4/m 2/m 2/m |
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III/D.10-140 Symesite! Pb10(SO4)O7Cl4·(H2O) B1 1 |
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Other Cotunnite Information
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References: |
NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
See Also: |
Links to other databases for Cotunnite :
1 -Am. Min. Crystal Structure Database
2 -Athena
3 - Crocoite.com Mineral Locations
4 - EUROmin Project
5 -Google Images
6 -Google Scholar
7 -Handbook of Mineralogy (UofA)
8 -MinDAT
9 -MinMax(Deutsch)
10 -MinMax(English)
11 -Mineralienatlas (Deutsch)
12 -QUT Mineral Atlas
13 - WWW-MINCRYST
14 -École des Mines de Paris
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Print or Cut-and-Paste your Cotunnite Specimen Label here :
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Cotunnite
PbCl2
Dana No: 9.2.7.1 Strunz No: III/D.10-40
Locality:
Notes:
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