Parkinsonite Mineral Data

General Parkinsonite Information

Chemical Formula:

(Pb,Mo,[ ])8O8Cl2

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

Empirical Formula:

Pb₇Mo_0.5O₈Cl₂

Environment:

In fractures and vugs in carbonates associated with Fe, Mn oxides.

IMA Status:

Approved IMA 1994

Locality:

Merehead Quarry, Cranmore, Somerset, England. Link to MinDat.org Location Data.

Name Origin:

Named after Reginald F. D. Parkinson, English mineral collector from Somerset.

Name Pronunciation:

Parkinsonite + Pronunciation

Synonym:

IMA1991-030

Parkinsonite Image

Images:

Parkinsonite

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

Axial Ratios:

a:c = 1:5.63977

Cell Dimensions:

a = 3.992, c = 22.514, Z = 1; V = 358.78 Den(Calc)= 7.85

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: I 4/mmm

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

By Intensity(I/I_o): 2.983(1), 2.816(0.78), 1.989(0.75),

Physical Properties of Parkinsonite

Cleavage:

{001} Perfect, {100} Good

Color:

Carmine red, Purple red, Brownish red.

Density:

7.32

Diaphaneity:

Translucent

Fracture:

Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

2-2.5 - Gypsum-Finger Nail

Luminescence:

Non-fluorescent.

Luster:

Adamantine

Streak:

dark red

Optical Properties of Parkinsonite

Dichroism (e):

greenish yellow.

Dichroism (w):

brownish red.

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

Optical Data:

Uniaxial (-), e=2.42, w=2.58, bire=0.1600.

RL Anisotrophism:

Weak to moderate.

RL Bireflectance:

Moderate.

RL Color:

Gray with deep red to red-orange internal reflections.

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**
Relative Intensity	0%	50%	100%	150%	200%	250%	300%	350%	400%	450%	500%
R₁
R₂

Calculated Properties of Parkinsonite

Electron Density:

Bulk Density (Electron Density)=6.41 gm/cc
note: Specific Gravity of Parkinsonite =7.85 gm/cc.

Fermion Index:

Fermion Index = 0.19
Boson Index = 0.81

Photoelectric:

PE_Parkinsonite=1,612.04 barns/electron
U=PE_Parkinsonite x rElectron Density=10333.73 barns/cc.

Radioactivity:

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

Parkinsonite Classification

Dana Class:

10.05.11.01 (10)Oxyhalides and Hydroxyhalides

(10.05)where Am (O,OH)p Xq

(10.05.11)Dana Group

10.05.11.01 Parkinsonite (Pb,Mo,[])8O8Cl2 I 4/mmm 4/m 2/m 2/m

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

References:

NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.79,p1011,1994) OPTIC PROP.(AntBidBlaNic3)

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

Parkinsonite

(Pb,Mo,[ ])8O8Cl2
Dana No: 10.05.11.01 Strunz No: 03.DB.40
Locality:

Notes: