Scrutinyite
A valid IMA mineral species
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About Scrutinyite
Formula:
α-PbO2
Colour:
Dark reddish brown, clove-brown, red on thin edges
Lustre:
Sub-Metallic
Specific Gravity:
9.867 (Calculated)
Crystal System:
Orthorhombic
Member of:
Name:
Named from the word "scrutiny," referring to the care required to making the initial identification of the mineral.
Co-Type Localities:
Dimorph of:
A secondary lead oxide difficult to distinguish from plattnerite.
An oxidation product in lead piping and oil paintings.
First described from Bingham, New Mexico, USA and Mapimi, Mexico by Taggart et al., 1988).
The crystal structure was solved by Zaslavskij and Tolkachev (1952), on synthetic α-PbO2.
An oxidation product in lead piping and oil paintings.
First described from Bingham, New Mexico, USA and Mapimi, Mexico by Taggart et al., 1988).
The crystal structure was solved by Zaslavskij and Tolkachev (1952), on synthetic α-PbO2.
Unique Identifiers
Mindat ID:
3598
Long-form identifier:
mindat:1:1:3598:5
IMA Classification of Scrutinyite
Approved
IMA Formula:
Pb4+O2
Approval year:
1984
First published:
1988
Classification of Scrutinyite
4.DB.20
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
B : With medium-sized cations; chains of edge-sharing octahedra
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
B : With medium-sized cations; chains of edge-sharing octahedra
4.4.6.2
4 : SIMPLE OXIDES
4 : AX2
4 : SIMPLE OXIDES
4 : AX2
7.11.24
7 : Oxides and Hydroxides
11 : Oxides of Sn and Pb
7 : Oxides and Hydroxides
11 : Oxides of Sn and Pb
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Sny | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Scrutinyite
Sub-Metallic
Transparency:
Translucent, Opaque
Colour:
Dark reddish brown, clove-brown, red on thin edges
Streak:
Dark brown
Cleavage:
Perfect
{100}, perfect; {010}, imperfect (forms by analogy to columbite).
{100}, perfect; {010}, imperfect (forms by analogy to columbite).
Density:
9.867 g/cm3 (Calculated)
Optical Data of Scrutinyite
Anisotropism:
Weak with a bluish color
Bireflectance:
Very weak, grey-white to bluish grey-white
Reflectivity:
| Wavelength | R1 (%) | R2 (%) |
|---|---|---|
| 546nm | 17.9% | 18.8% |
| 589nm | 17.0% | 17.9% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 18.8%.
R1 shown in black, R2 shown in red
Colour in reflected light:
Grey-white
Internal Reflections:
Reddish brown
Pleochroism:
Not Visible
Chemistry of Scrutinyite
Mindat Formula:
α-PbO2
Elements listed:
Crystallography of Scrutinyite
Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/m) - Dipyramidal
Space Group:
Pbcn
Cell Parameters:
a = 4.971(2) Å, b = 5.956(2) Å, c = 5.438(2) Å
Ratio:
a:b:c = 0.835 : 1 : 0.913
Unit Cell V:
161.00 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Tabular crystals up to 30 micron.
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0011770 | Scrutinyite | Wyckoff R W G (1963) Second edition. Interscience Publishers, New York, New York Crystal Structures 1 239-444 | 1963 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.816 Å | (40) |
| 3.497 Å | (30) |
| 3.117 Å | (100) |
| 2.722 Å | (50) |
| 1.840 Å | (80) |
| 1.635 Å | (40) |
| 1.527 Å | (50) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47h : [Near-surface oxidized, dehydrated minerals] |
Type Occurrence of Scrutinyite
Co-Type Localities:
General Appearance of Type Material:
Euhedral crystals 25-30 microns across and 1-2 microns thick.
Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA, 165479.
Geological Setting of Type Material:
Oxidation product of hydrothermal mineralization.
Associated Minerals at Type Locality:
Synonyms of Scrutinyite
Other Language Names for Scrutinyite
Relationship of Scrutinyite to other Species
Member of:
Other Members of Ixiolite Group:
| Ixiolite-(Fe2+) | (Ta0.67Fe2+0.33)O2 | Orth. mmm(2/m2/m2/m) : Pbcn |
| Ixiolite-(Mn2+) | (Ta0.67Mn2+0.33)O2 | Orth. mmm(2/m2/m2/m) : Pbcn |
| Ixiolite-(Sc) | (Ta0.5Sc0.5)O2 | Orth. mmm(2/m2/m2/m) : Pbcn |
| Nioboixiolite-(Fe2+) | (Nb0.67Fe2+0.33)O2 | Orth. mmm(2/m2/m2/m) : Pbcn |
| Nioboixiolite-(Fe3+) | (Nb0.5Fe3+0.5)O2 | Orth. mmm(2/m2/m2/m) : Pbcn |
| Nioboixiolite-(Mn2+) | (Nb0.67Mn2+0.33)O2 | Orth. mmm(2/m2/m2/m) : Pbcn |
| Nioboixiolite-([]) | (Nb0.8◻0.2)4+O2 | Orth. mmm(2/m2/m2/m) : Pbcn |
| Seifertite | SiO2 | Orth. mmm(2/m2/m2/m) : Pbcn |
| Srilankite | TiO2 | Orth. mmm(2/m2/m2/m) : Pbcn |
Common Associates
Associations Based on Photo Data:
| 12 photos of Scrutinyite associated with Plattnerite | PbO2 |
| 9 photos of Scrutinyite associated with Quartz | SiO2 |
| 5 photos of Scrutinyite associated with Murdochite | Cu12Pb2O15Cl2 |
| 3 photos of Scrutinyite associated with Rosasite | (Cu,Zn)2(CO3)(OH)2 |
| 2 photos of Scrutinyite associated with Wulfenite | Pb(MoO4) |
| 2 photos of Scrutinyite associated with Mottramite | PbCu(VO4)(OH) |
| 1 photo of Scrutinyite associated with 'Selenite' | CaSO4 · 2H2O |
Related Minerals - Strunz-mindat Grouping
| 4.DB. | Tianhongqiite | CrTiO3(OH) |
| 4.DB. | Nioboheftetjernite | ScNbO4 |
| 4.DB. | Huangshanite | Fe3+TaO4 |
| 4.DB. | Nioboixiolite-(Mn2+) | (Nb0.67Mn2+0.33)O2 |
| 4.DB. | Shakhdaraite-(Y) | ScYNb2O8 |
| 4.DB.05 | Varlamoffite | Sn1-xFexO2-x(OH) |
| 4.DB.05 | Argutite | GeO2 |
| 4.DB.05 | Cassiterite | SnO2 |
| 4.DB.05 | Rutile | TiO2 |
| 4.DB.05 | Plattnerite | PbO2 |
| 4.DB.05 | Tripuhyite | Fe3+Sb5+O4 |
| 4.DB.05 | Tugarinovite | MoO2 |
| 4.DB.05 | Pyrolusite | Mn4+O2 |
| 4.DB.10 | Byströmite | MgSb2O6 |
| 4.DB.10 | Ordoñezite | ZnSb2O6 |
| 4.DB.10 | Tredouxite | NiSb2O6 |
| 4.DB.10 | Tapiolite-(Mn) | Mn2+Ta2O6 |
| 4.DB.10 | Tapiolite-(Fe) | Fe2+Ta2O6 |
| 4.DB.15a | Paramontroseite | V4+O2 |
| 4.DB.15a | Ramsdellite | Mn4+O2 |
| 4.DB.15b | Akhtenskite | ε-Mn4+O2 |
| 4.DB.15c | Nsutite | (Mn4+,Mn2+)(O,OH)2 |
| 4.DB.20 | Nioboixiolite-([]) | (Nb0.8◻0.2)4+O2 |
| 4.DB.25 | Ishikawaite | U4+Fe2+Nb2O8 |
| 4.DB.25 | Yttrocolumbite-(Y) | Y(U4+,Fe2+)Nb2O8 |
| 4.DB.25 | Calciosamarskite | (Ca,U4+)Fe3+(Nb,Ta,Ti)2O8 |
| 4.DB.25 | Samarskite-(Yb) | YbFe3+(Nb,Ta)2O8 |
| 4.DB.25 | Ixiolite-(Sc) | (Ta0.5Sc0.5)O2 |
| 4.DB.25 | Ixiolite-(Fe2+) | (Ta0.67Fe2+0.33)O2 |
| 4.DB.25 | Ixiolite-(Mn2+) | (Ta0.67Mn2+0.33)O2 |
| 4.DB.25 | Nioboixiolite-(Fe2+) | (Nb0.67Fe2+0.33)O2 |
| 4.DB.25 | Srilankite | TiO2 |
| 4.DB.25 | Samarskite-(Y) | YFe3+Nb2O8 |
| 4.DB.25 | Nioboixiolite-(Fe3+) | (Nb0.5Fe3+0.5)O2 |
| 4.DB.30 va | Wolframite Group | |
| 4.DB.30 | Rossovskyite | (Fe3+,Ta)(Nb,Ti)O4 |
| 4.DB.30 | Huanzalaite | MgWO4 |
| 4.DB.30 | Heftetjernite | ScTaO4 |
| 4.DB.30 | Hübnerite | MnWO4 |
| 4.DB.30 | Sanmartinite | (Zn,Fe)WO4 |
| 4.DB.30 | Ferberite | FeWO4 |
| 4.DB.30 | 'Krasnoselskite' | CoWO4 |
| 4.DB.35 | Qitianlingite | (Fe,Mn)2(Nb,Ta)2WO10 |
| 4.DB.35 | Tantalaeschynite-(Ce) | Ce(TiTa)O6 |
| 4.DB.35 | Tantalite-(Mg) | (Mg,Fe2+)(Ta,Nb)2O6 |
| 4.DB.35 | Columbite-(Mn) | Mn2+Nb2O6 |
| 4.DB.35 | Tantalite-(Mn) | Mn2+Ta2O6 |
| 4.DB.35 | Columbite-(Fe) | Fe2+Nb2O6 |
| 4.DB.35 | Columbite-(Mg) | (Mg,Fe,Mn)(Nb,Ta)2O6 |
| 4.DB.35 | Tantalite-(Fe) | Fe2+Ta2O6 |
| 4.DB.40 | Ferrotitanowodginite | Fe2+TiTa2O8 |
| 4.DB.40 | 'Wolframowodginite' | Mn(Mn,Sn,Fe,Ta)(W,Ta,Nb)2O8 |
| 4.DB.40 | Lithiotantite | LiTa3O8 |
| 4.DB.40 | Lithiowodginite | LiTa3O8 |
| 4.DB.40 | Titanowodginite | Mn2+TiTa2O8 |
| 4.DB.40 | Tantalowodginite | (Mn2+0.5◻0.5)TaTa2O8 |
| 4.DB.40 | Wodginite | Mn2+Sn4+Ta2O8 |
| 4.DB.40 | Ferrowodginite | Fe2+Sn4+Ta2O8 |
| 4.DB.45 | Tivanite | V3+TiO3(OH) |
| 4.DB.50 | Carmichaelite | (Ti,Cr,Fe)[O2-x(OH)x] |
| 4.DB.55 | Alumotantite | AlTaO4 |
| 4.DB.60 | Biehlite | ((Sb,As)O)2[MoO4] |
Fluorescence of Scrutinyite
Not fluorescent.
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Scrutinyite
mindat.org URL:
https://www.mindat.org/min-3598.html
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References for Scrutinyite
Reference List:
Localities for Scrutinyite
Showing 11 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Greece | |
| |
| 62 +2 other references |
Mexico (TL) | |
| Taggart et al. (1988) +2 other references |
Namibia | |
| Brandstätter +4 other references |
Serbia | |
| Mineco Limited |
Spain | |
| Joan Abella i Creus (Joanabellacreus@gmail.com) |
USA | |
| Castor et al. (2004) |
| Northrop et al. (1996) |
| Taggart et al. (1988) |
| DeMark et al. (1999) | |
| King et al. (1995) |
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Grand Deposit Mine, Muncy Creek Mining District, White Pine County, Nevada, USA