Cotunnite Mineral Data

Advertisment

Dakota Matrix was founded in 1996 and has offered systematic and rare mineral specimens online since 1998.

Weinrich Minerals, A Dealer in Fine Mineral Specimens - Since 1989. We buy collections and single high quality specimens.

A Bijoux.com is an online store specialized in the sale on the internet of precious stones , gems , minerals and jewels for individuals and professionals

General Cotunnite Information

Chemical Formula:

PbCl2

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

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.

Name Origin:

Named for Domenico Cotugno (Cotunnius) (1736-1822), Italian physician and Professor of Anatomy, University of Naples, Naples, Italy.

Synonym:

ICSD 27736

PDF 26-1150

Cotunnite Image

Images:

Cotunnite

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

Images:

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

Cotunnite Crystallography

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

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

By Intensity(I/I_o): 3.581(1), 3.89(0.73), 2.778(0.56),

Forms:

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

Warning: this large pop-up is very compute intensive and may not work well with some computers.

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Wyckoff R W G , Crystal Structures , 1 (1963) p.298-306, Second edition. Interscience Publishers, New York, New York

Physical Properties of Cotunnite

Cleavage:

{001} Perfect

Color:

Colorless, Green, Yellow, White.

Density:

5.3 - 5.8, Average = 5.55

Diaphaneity:

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

Optical Properties of Cotunnite

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

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

Electron Density:

Bulk Density (Electron Density)=4.93 gm/cc
note: Specific Gravity of Cotunnite =5.91 gm/cc.

Fermion Index:

Fermion Index = 0.16
Boson Index = 0.84

Photoelectric:

PE_Cotunnite=1,372.93 barns/electron
U=PE_Cotunnite x rElectron Density=6,768.86 barns/cc.

Radioactivity:

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

Cotunnite Classification

Dana Class:

09.02.07.01 (09)Anhydrous and Hydrated Halides

(09.02)where A (X)2

(09.02.07)Cotunnite Group

09.02.07.01 Cotunnite PbCl2 Pnam 2/m 2/m 2/m

09.02.07.02 Hydrophilite? CaCl2 Pnnm 2/m 2/m 2/m

09.02.07.03 Coccinite! HgI2(?) P 4₁/nmc 4/m 2/m 2/m

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

References:

NAME( AntBidBlaNic3) 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 - 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
15 - WWW-MINCRYST

Search for Cotunnite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Cotunnite :

A Bijoux Google Search for Cotunnite
Adam's Minerals Google Search for Cotunnite
Cape Minerals Google Search for Cotunnite
Dakota Matrix Minerals Google Search for Cotunnite
Excalibur Mineral Corp. Google Search for Cotunnite
Exceptional Minerals Google Search for Cotunnite
John Betts Fine Minerals Search for Cotunnite
McDougall Minerals Google Search for Cotunnite
Mineral News Website Link
Rock and Mineral Shows Google Search for Cotunnite
Weinrich Minerals, Inc. Google Search for Cotunnite

Ask about Cotunnite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Cotunnite

PbCl2
Dana No: 09.02.07.01 Strunz No: 03.DC.85
Locality:

Notes: