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Pseudocotunnite Mineral Data
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General Pseudocotunnite Information
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 Chemical Formula: |
K2PbCl4 (?) |
| Composition: |
Molecular Weight = 427.21 gm |
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Potassium 18.30 % K 22.05 % K2O |
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Lead 48.50 % Pb 52.25 % PbO |
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Chlorine 33.19 % Cl 33.19 % Cl |
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- %
Cl -7.49 % -O=Cl2 |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
K2PbCl4 |
| Environment: |
In fumaroles, associated with cotunnite. |
| IMA Status: |
Valid Species (Pre-IMA) 1873 |
| Locality: |
Vesuvius, Italy. Link to MinDat.org Location Data. |
| Name Origin: |
Named for the Greek "pseudo", false and cotunnite, a mineral it resembles in some respects. |
| Name Pronunciation: |
Pseudocotunnite + Pronunciation  |
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Pseudocotunnite Image |
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Images:
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Pseudocotunnite Crystallography
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| Axial Ratios: |
a:b:c =0.8322:1:0.4889 |
| Cell Dimensions: |
a = 9.82, b = 11.8, c = 5.77, Z = 4; V = 668.60 Den(Calc)= 4.24 |
| Crystal System: |
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma |
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Physical Properties of Pseudocotunnite
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| Color: |
Colorless, Green yellow, Yellow, White. |
| Density: |
4.25 |
| Diaphaneity: |
Transparent to Translucent |
| Habit: |
Acicular - Occurs as needle-like crystals. |
| Habit: |
Aggregates - Made of numerous individual crystals or clusters. |
| Habit: |
Platy - Sheet forms (e.g. micas). |
| Luster: |
Earthy (Dull) |
| Streak: |
white |
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Optical Properties of Pseudocotunnite
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| Optical Data: |
Biaxial (?), b=2 |
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Calculated Properties of Pseudocotunnite
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| Electron Density: |
Bulk Density (Electron Density)=3.73 gm/cc
note: Specific Gravity of Pseudocotunnite =4.24 gm/cc.
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| Fermion Index: |
Fermion Index = 0.1
Boson Index = 0.9 |
| Photoelectric: |
PEPseudocotunnite = 850.37 barns/electron
U=PEPseudocotunnite x relectron=3,173.40 barns/cc.
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| Radioactivity: |
GRapi = 232.44 (Gamma Ray American Petroleum Institute Units)
Concentration of Pseudocotunnite per GRapi unit = 0.43 (%)
Estimated Radioactivity from Pseudocotunnite  - barely detectable
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Pseudocotunnite Classification
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| Dana Class: |
11.02.01.01 (11)Halide Complexes; Alumino-fluorides |
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(11.02)where (A)m B (X)4 |
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(11.02.01)Dana Group |
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11.02.01.01 Pseudocotunnite K2PbCl4(?) P nma 2/m 2/m 2/m |
| Strunz Class: |
03.DC.90 03 - HALIDES |
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03.D - Oxyhalides, Hydroxyhalides and Related Double Halides |
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03.DC -With Pb (As,Sb,Bi), without Cu |
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03.DC.90 Pseudocotunnite K2PbCl4(?) P nma 2/m 2/m 2/m |
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Other Pseudocotunnite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8) |
| 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 :
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Pseudocotunnite
K2PbCl4 (?)
Dana No: 11.02.01.01 Strunz No: 03.DC.90
Locality:
Notes:
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