Parkinsonite Mineral Data

Parkinsonite Mineral Data +

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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.

Synonym:

IMA1991-030

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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

Diaphaniety:

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

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:

r_electron=6.41 gm/cc
note: r_Parkinsonite=7.85 gm/cc.

Fermion Index

Fermion Index = 0.19609
Boson Index = 0.80391

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Parkinsonite is Not Radioactive

Parkinsonite Classification

Dana Class:

10.5.11.1 (10)Oxyhalides and Hydroxyhalides

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

(10.5.11)Dana Group

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

Strunz Class:

III/D.11-55 III - Halogenides

III/D - Oxi-halogenides with Pb - Bi - Sb and related compounds

III/D.11 - Mendipite - Onoratoite series

III/D.11-10 Mendipite Pb3Cl2O2 P 2₁2₁2₁ 2 2 2

III/D.11-15 Damaraite Pb3O2(OH)Cl Pmc2 mm2

III/D.11-17 Chubutite* Pb7O6Cl2 Unk Ortho

III/D.11-20 Penfieldite Pb2Cl3(OH) P 6/mmm 6/m 2/m 2/m

III/D.11-30 Blixite Pb2Cl(O,OH)2 Unk Ortho

III/D.11-35 Mereheadite! Pb2O(OH)Cl C 2/c 2/m

III/D.11-40 Sundiusite Pb10(SO4)Cl2O8 C 2,Cm,C 2/m Mono

III/D.11-50 Asisite Pb12(SiO4)O8Cl4 I 4/mmm 4/m 2/m 2/m

III/D.11-55 Parkinsonite (Pb,Mo,[])8O8Cl2 I 4/mmm 4/m 2/m 2/m

III/D.11-60 Thorikosite Pb3(Sb,As)O3(OH)Cl2 I 4/mmm 4/m 2/m 2/m

III/D.11-65 Philolithite! Pb12O6Mn(Mg,Mn)2(Mn,Mg)4(SO4)(CO3)4Cl4(OH)12 P 4₁/nnm 4/m 2/m 2/m

III/D.11-70 Pinalite Pb3(WO4)OCl2 Amam 2/m 2/m 2/m

III/D.11-80 Nadorite PbSbO2Cl Bmmb 2/m 2/m 2/m

III/D.11-90 Perite PbBiO2Cl Bmmb 2/m 2/m 2/m

III/D.11-100 Heliophyllite Pb6As2O7Cl4 Unk Ortho

III/D.11-110 Ecdemite Pb6As2O7Cl4 Unk Tetra

III/D.11-120 Onoratoite Sb8O11Cl2 C 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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

Parkinsonite

(Pb,Mo,[ ])8O8Cl2
Dana No: 10.5.11.1 Strunz No: III/D.11-55
Locality:

Notes: