General Information
|
 Chemical Formula: |
K2PbCl4 (?) |
| Composition: |
Molecular Weight = 427.21 gm) |
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| Empirical Formula: |
K2PbCl4 |
| Environment: |
In fumaroles, associated with cotunnite. |
| Locality: |
Vesuvius, Italy. |
| Name Origin: |
Named for the Greek "pseudo", false and cotunnite, a mineral it resembles in some respects. |
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Classification
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| Dana Class: |
11.2.1.1 (11)Halide Complexes; Alumino-fluorides |
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(11.2)where (A)m B (X)4 |
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(11.2.1)Dana Group |
| Strunz Class: |
III/D.10-50 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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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: Pnma |
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Physical Properties
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| Color: |
colorless, green yellow, yellow, or white. |
| Density: |
4.25 |
| Diaphaniety: |
Transparent to Translucent |
| Habits: |
Acicular - Occurs as needle-like crystals., Platy - Sheet forms (e.g. micas)., Aggregates - Made of numerous individual crystals or clusters. |
| Luster: |
Earthy (Dull) |
| Streak: |
white |
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Optical Properties
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| Optical Data: |
Biaxial (?), b=2 |
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Other Information
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| References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8) |
| See Also: |
Links to other data for Pseudocotunnite :
1 -Athena Mineralogy
2 - EUROmin Project
3 -MinDat.org Location Data
4 -MinMax
5 -École des Mines de Paris
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