Mineralogy Database

Parkinsonite Mineral Data

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General Parkinsonite Information

Help on Chemical  Formula: Chemical Formula: (Pb,Mo,[ ])8O8Cl2
Help on Composition: Composition: Molecular Weight = 1,697.27 gm
   Molybdenum   2.83 %  Mo    3.77 % MoO2
   Lead        85.45 %  Pb   92.05 % PbO
   Chlorine     4.18 %  Cl    4.18 % Cl
                 -   %   Cl   -0.94 % -O=Cl2   
   Oxygen       7.54 %  O
              ______        ______ 
              100.00 %       99.06 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Pb7Mo0.5O8Cl2
Help on Environment: Environment: In fractures and vugs in carbonates associated with Fe, Mn oxides.
Help on IMA Status: IMA Status: Approved IMA 1994
Help on Locality: Locality: Merehead Quarry, Cranmore, Somerset, England. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after Reginald F. D. Parkinson, English mineral collector from Somerset.
Help on Name Pronunciation: Name Pronunciation: Parkinsonite + Pronunciation Say PARKINSONITE
Help on Synonym: Synonym: IMA1991-030

Parkinsonite Image

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Comments: Prismatic crystals of parkinsonite projecting into cerussite and illustrating {001} cleavage and irregular fracture. Associated mineral is wulfenite. (MinMag, v58:390).
Location: Merehead Quarry, Cranmore, Somerset, in the south west of England. Scale: Scale Bar 250 µm.
© Mineralogical Magazine

Parkinsonite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:5.63977
Help on Cell Dimensions: Cell Dimensions: a = 3.992, c = 22.514, Z = 1; V = 358.78 Den(Calc)= 7.85
Help on Crystal System: Crystal System: Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: I 4/mmm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.983(1), 2.816(0.78), 1.989(0.75),

Physical Properties of Parkinsonite

Help on Cleavage: Cleavage: {001} Perfect, {100} Good
Help on Color: Color: Carmine red, Purple red, Brownish red.
Help on Density: Density: 7.32
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Hardness: Hardness: 2-2.5 - Gypsum-Finger Nail
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Adamantine
Help on Streak: Streak: dark red

Optical Properties of Parkinsonite

Help on Dichroism (e): Dichroism (e): greenish yellow.
Help on Dichroism (w): Dichroism (w): brownish red.
Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.511 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.409 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1911,KPDmeas= 0.2049,KC= 0.1356
Ncalc = 1.99 - 2.06
Help on Optical Data: Optical Data: Uniaxial (-), e=2.42, w=2.58, bire=0.1600.
Help on RL Anisotrophism: RL Anisotrophism: Weak to moderate.
Help on RL Bireflectance: RL Bireflectance: Moderate.
Help on RL Color: RL Color: Gray with deep red to red-orange internal reflections.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Parkinsonite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   22.60   21.80 
 420 nm   22.40   21.20 
 440 nm   22.30   20.50 
 460 nm   22.20   19.90 
 480 nm   21.90   19.40 
 500 nm   21.60   18.90 
 520 nm   21.20   18.50 
 540 nm   20.60   18.10 
 560 nm   20.20   17.80 
 580 nm   19.80   17.50 
 600 nm   19.40   17.20 
 620 nm   19.10   17.10 
 640 nm   18.90   17.00 
 660 nm   18.70   16.90 
 680 nm   18.60   16.70 
 700 nm   18.50   16.70 
Calculated Relative Intensity Colors of Parkinsonite in Air
   0%   50% 100% 150% 200% 250% 300% 350% 400% 450% 500%

Calculated Properties of Parkinsonite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.41 gm/cc
note: Specific Gravity of Parkinsonite =7.85 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.19
Boson Index = 0.81
Help on Photoelectric: Photoelectric: PEParkinsonite =1,612.04 barns/electron
U=PEParkinsonite x rElectron Density=10333.73 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Parkinsonite is Not Radioactive

Parkinsonite Classification

Help on  Dana Class: Dana Class: (10)Oxyhalides and Hydroxyhalides
  (10.05)where Am (O,OH)p Xq
  (10.05.11)Dana Group Parkinsonite (Pb,Mo,[])8O8Cl2 I 4/mmm 4/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 03.DB.40 03 - HALIDES
  03.D - Oxyhalides, Hydroxyhalides and Related Double Halides
  03.DB -With Pb, Cu, etc.
03.DB.40 Asisite Pb12(SiO4)O8Cl4 I 4/mmm 4/m 2/m 2/m
03.DB.40 Parkinsonite (Pb,Mo,[])8O8Cl2 I 4/mmm 4/m 2/m 2/m

Other Parkinsonite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.79,p1011,1994) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Parkinsonite :
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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(Pb,Mo,[ ])8O8Cl2
Dana No: Strunz No: 03.DB.40





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