Scrutinyite Mineral Data

Scrutinyite Mineral Data +

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General Scrutinyite Information

Chemical Formula:

PbO2

Composition:

Molecular Weight = 239.20 gm

Lead 86.62 % Pb 100.00 % PbO₂

Oxygen 13.38 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

PbO₂

Environment:

Oxidized portions of Pb bearing deposits closely associated with plattnerite.

IMA Status:

Approved IMA 1988

Locality:

Sunshine #1 mine, Hansonburg district, Socorro County, New Mexico. Link to MinDat.org Location Data.

Name Origin:

The name alludes to the close scrutiny that is necessary to distinguish the mineral from its dimorph, plattnerite.

Synonym:

ICSD 20362

PDF 45-1416

Scrutinyite Image

Images:

Scrutinyite

Comments: Acicular crystals of scrutinyite.
Location: Hilarion Mine, Agios Konstantinos, Lavrion District, Attik? Prefecture, Greece. Scale: Picture size 1 mm.
© Thomas Witzke / Abraxas-Verlag

Scrutinyite Crystallography

Axial Ratios:

a:b:c =0.8346:1:0.913

Cell Dimensions:

a = 4.971, b = 5.956, c = 5.438, Z = 4; V = 161.00 Den(Calc)= 9.87

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P bcn

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

By Intensity(I/I_o): 3.117(1), 1.84(0.8), 2.722(0.5),

Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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Wyckoff R W G , Crystal Structures , 1 (1963) p.239-444, Second edition. Interscience Publishers, New York, New York, Note: known as alpha-PbO2

Physical Properties of Scrutinyite

Cleavage:

[100] Perfect, [010] Imperfect

Color:

Dark reddish brown.

Diaphaniety:

Transparent to translucent

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Habit:

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

Luminescence:

Non-fluorescent.

Luster:

Sub Metallic

Streak:

dark brown

Optical Properties of Scrutinyite

Optical Data:

NCalc= 2.04 - from Gladstone-Dale relationship (KC = 0.105) where Ncalc=Dcalc*KC+1

RL Anisotrophism:

Weak, pale blue.

RL Bireflectance:

Very weak, gray-white to bluish gray.

RL Color:

Gray-white with reddish brown internal reflections.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Scrutinyite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
546 nm	17.90	18.80
589 nm	17.00	17.90

**Calculated Relative Intensity Colors of Scrutinyite in Air**
Relative Intensity	0%	60%	100%	120%	180%	240%	300%	360%	420%	480%	510%
R₁
R₂

Calculated Properties of Scrutinyite

Electron Density:

r_electron=8.09 gm/cc
note: r_Scrutinyite=9.87 gm/cc.

Fermion Index

Fermion Index = 0.19149
Boson Index = 0.80851

Photoelectric:

PE_Scrutinyite=1,622.85 barns/electron
U=PE_Scrutinyite x r_electron=13124.76 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Scrutinyite is Not Radioactive

Scrutinyite Classification

Dana Class:

4.4.6.2 (4)Simple Oxides

(4.4)with a cation charge of 4+ (A++++ O2)

(4.4.6)Dana Group

4.4.6.1 Tellurite TeO2 P bca 2/m 2/m 2/m

4.4.6.2 Scrutinyite PbO2 P bcn 2/m 2/m 2/m

Strunz Class:

IV/D.15-40 IV - Oxides

IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)

IV/D.15 - Brookite - Kuranakhite series

IV/D.15-10 Brookite TiO2 Pcab 2/m 2/m 2/m

IV/D.15-20 Srilankite (Ti,Zr)O2 P bcn 2/m 2/m 2/m

IV/D.15-25 Carmichaelite! (Ti,Cr,Fe)[O2-x(OH)x],x~0.5 P 2₁/c 2/m

IV/D.15-30 Tellurite TeO2 P bca 2/m 2/m 2/m

IV/D.15-40 Scrutinyite PbO2 P bcn 2/m 2/m 2/m

IV/D.15-50 Kuranakhite PbMnTeO6 Unk Ortho

Other Scrutinyite Information

References:

NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.75,p709,1990) OPTIC PROP.(AntBidBlaNic3)

See Also:

Links to other databases for Scrutinyite :
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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Scrutinyite

PbO2
Dana No: 4.4.6.2 Strunz No: IV/D.15-40
Locality:

Notes: