Mineralogy Database

Pseudocotunnite Mineral Data

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General Pseudocotunnite Information

Help on Chemical  Formula: Chemical Formula: K2PbCl4 (?)
Help on Composition: Composition: Molecular Weight = 427.21 gm
   Potassium  18.30 %  K    22.05 % K2O
   Lead       48.50 %  Pb   52.25 % PbO
   Chlorine   33.19 %  Cl   33.19 % Cl
                -   %   Cl   -7.49 % -O=Cl2   
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K2PbCl4
Help on Environment: Environment: In fumaroles, associated with cotunnite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1873
Help on Locality: Locality: Vesuvius, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the Greek "pseudo", false and cotunnite, a mineral it resembles in some respects.
Help on Name Pronunciation: Name Pronunciation: Pseudocotunnite + Pronunciation Say PSEUDOCOTUNNITE

Pseudocotunnite Image

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Comments: Bright white botryoidal pseudocotunnite coatings.
Location: Vesuvius, Campania, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Pseudocotunnite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.8322:1:0.4889
Help on Cell Dimensions: Cell Dimensions: a = 9.82, b = 11.8, c = 5.77, Z = 4; V = 668.60 Den(Calc)= 4.24
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma

Physical Properties of Pseudocotunnite

Help on Color: Color: Colorless, Green yellow, Yellow, White.
Help on Density: Density: 4.25
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Luster: Luster: Earthy (Dull)
Help on Streak: Streak: white

Optical Properties of Pseudocotunnite

Help on Optical Data: Optical Data: Biaxial (?), b=2

Calculated Properties of Pseudocotunnite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.73 gm/cc
note: Specific Gravity of Pseudocotunnite =4.24 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.1
Boson Index = 0.9
Help on Photoelectric: Photoelectric: PEPseudocotunnite = 850.37 barns/electron
U=PEPseudocotunnite x relectron=3,173.40 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 232.44 (Gamma Ray American Petroleum Institute Units)
Concentration of Pseudocotunnite per GRapi unit = 0.43 (%)

Estimated Radioactivity from Pseudocotunnite - barely detectable


Pseudocotunnite Classification

Help on  Dana Class: Dana Class: (11)Halide Complexes; Alumino-fluorides
  (11.02)where (A)m B (X)4
  (11.02.01)Dana Group Pseudocotunnite K2PbCl4(?) P nma 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 03.DC.90 03 - HALIDES
  03.D - Oxyhalides, Hydroxyhalides and Related Double Halides
  03.DC -With Pb (As,Sb,Bi), without Cu
03.DC.90 Pseudocotunnite K2PbCl4(?) P nma 2/m 2/m 2/m

Other Pseudocotunnite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Pseudocotunnite :
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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Print or Cut-and-Paste your Pseudocotunnite Specimen Label here :


K2PbCl4 (?)
Dana No: Strunz No: 03.DC.90





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