Pencil Ore
A synonym
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About Pencil Ore
Hard, fibrous masses of hematite that can be split up into thin rods.
[C.M.D]
These pencils are sometimes used to mark sandstone.
Macfarlane. 1916
[C.M.D]
These pencils are sometimes used to mark sandstone.
Macfarlane. 1916
Unique Identifiers
Mindat ID:
5487
Long-form identifier:
mindat:1:1:5487:0
Age distribution
Recorded ages:
Mesozoic : 236 ± 7 Ma to 145 ± 4 Ma - based on 6 recorded ages.
Chemical Analysis
Oxide wt%:
| 1 | 2 | 3 | |
|---|---|---|---|
| Fe2O3 | 87.0 % | 86.95 % | |
| MnO2 | 2.5 % | 2.93 % | |
| SiO2 | 5.0 % | 8.20 % | |
| Al2O3 | 2.0 % | 0.73 % | 0.12 % |
| Loss | 3.5 % | 1.19 % | |
| TiO2 | 5.69 % | ||
| MnO | 0.16 % | ||
| FeO | 88.91 % | ||
| MgO | 0.47 % | ||
| Total: | 100 % | 100 % | 95.35 % |
Empirical formulas:
| Sample ID | Empirical Formula |
|---|---|
| 3 | (Fe3+,Al)1.774(Fe2+, Mg, Mn)0.113Ti0.113O3 |
Sample references:
| ID | Locality | Reference | Notes |
|---|---|---|---|
| 1 | Bihain, Vielsalm, Luxembourg, Wallonia, Belgium | ||
| 2 | Colanhan, Lierneux, Liège, Wallonia, Belgium | ||
| 3 | Dypingdal serpentine-magnesite deposit, Snarum, Modum, Buskerud, Norway | Microprobe, Fe2+ |
Crystal Structure
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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) |
|---|---|---|---|---|---|---|---|
| 0000049 | Graphite | Kukesh J S, Pauling L (1950) The problem of the graphite structure American Mineralogist 35 125-125 | 1950 | 0 | 293 | ||
| 0011247 | Graphite | Wyckoff R W G (1963) Second edition. Interscience Publishers, New York, New York Crystal Structures 1 7-83 | 1963 | 0 | 293 | ||
| 0013978 | Graphite | Fayos J (1999) Possible 3D carbon structures as progressive intermediates in graphite to diamond phase transition Journal of Solid State Chemistry 148 278-285 | 1999 | 0 | 293 | ||
| 0013979 | Graphite | Fayos J (1999) Possible 3D carbon structures as progressive intermediates in graphite to diamond phase transition Journal of Solid State Chemistry 148 278-285 | 1999 | 0 | 293 | ||
| 0013980 | Graphite | Fayos J (1999) Possible 3D carbon structures as progressive intermediates in graphite to diamond phase transition Journal of Solid State Chemistry 148 278-285 | 1999 | 0 | 293 | ||
| 0013981 | Graphite | Fayos J (1999) Possible 3D carbon structures as progressive intermediates in graphite to diamond phase transition Journal of Solid State Chemistry 148 278-285 | 1999 | 0 | 293 | ||
| 0013982 | Graphite | Fayos J (1999) Possible 3D carbon structures as progressive intermediates in graphite to diamond phase transition Journal of Solid State Chemistry 148 278-285 | 1999 | 0 | 293 | ||
| 0014675 | Graphite | Trucano P, Chen R (1975) Structure of graphite by neutron diffraction Nature 258 136-137 | 1975 | undefined | 0 | 293 | |
| 0018217 | Graphite | Nixon D, Parry G, Ubbelohde A (1966) Order-disorder transformations in graphite nitrates _cod_database_code 1100002 Proceedings of the Royal Society of London 291 324-339 | 1966 | 0 | 293 | ||
| 0015334 | Graphite | Lipson H, Stokes A R (1942) The structure of graphite Proceedings of the Royal Society of London A181 101-105 | 1942 | Ceylon, Bavaria | 0 | 293 | |
| 0017960 | Graphite | Hassel O (1924) Ueber die Kristallstruktur des Graphits. _cod_database_code 1011060 Zeitschrift fur Physik 25 317-337 | 1924 | 0 | 293 | ||
| 0000143 | Hematite | Blake R L, Hessevick R E, Zoltai T, Finger L W (1966) Refinement of the hematite structure American Mineralogist 51 123-129 |  | 1966 | Elba, Italy | 0 | 293 |
| 0002228 | Hematite | Gualtieri A, Venturelli P (1999) In situ study of the goethite-hematite phase transformation by real time synchrotron powder diffraction American Mineralogist 84 895-904 | | 1999 | 0 | 586 | |
| 0002229 | Hematite | Gualtieri A, Venturelli P (1999) In situ study of the goethite-hematite phase transformation by real time synchrotron powder diffraction American Mineralogist 84 895-904 | | 1999 | 0 | 790 | |
| 0002230 | Hematite | Gualtieri A, Venturelli P (1999) In situ study of the goethite-hematite phase transformation by real time synchrotron powder diffraction American Mineralogist 84 895-904 | | 1999 | 0 | 1052 | |
| 0017806 | Hematite | Maslen E N, Streltsov V A, Streltsova N R, Ishizawa N (1994) Synchrotron X-ray study of the electron density in alpha-Fe2O3 Acta Crystallographica B50 435-441 |  | 1994 | synthetic | 0 | 293 |
| 0017807 | Hematite | Maslen E N, Streltsov V A, Streltsova N R, Ishizawa N (1994) Synchrotron X-ray study of the electron density in alpha-Fe2O3 Acta Crystallographica B50 435-441 | | 1994 | synthetic | 0 | 293 |
| 0017808 | Hematite | Maslen E N, Streltsov V A, Streltsova N R, Ishizawa N (1994) Synchrotron X-ray study of the electron density in alpha-Fe2O3 Acta Crystallographica B50 435-441 | | 1994 | synthetic | 0 | 293 |
| 0017731 | Hematite | Finger L W, Hazen R M (1980) Crystal structure and isothermal compression of Fe2O3, Cr2O3, and V2O3 to 50 kbars Journal of Applied Physics 51 5362-5367 | 1980 | synthetic | 0.0001 | 293 | |
| 0017732 | Hematite | Finger L W, Hazen R M (1980) Crystal structure and isothermal compression of Fe2O3, Cr2O3, and V2O3 to 50 kbars Journal of Applied Physics 51 5362-5367 | 1980 | synthetic | 1.54 | 293 | |
| 0017733 | Hematite | Finger L W, Hazen R M (1980) Crystal structure and isothermal compression of Fe2O3, Cr2O3, and V2O3 to 50 kbars Journal of Applied Physics 51 5362-5367 | 1980 | synthetic | 3.14 | 293 | |
| 0017734 | Hematite | Finger L W, Hazen R M (1980) Crystal structure and isothermal compression of Fe2O3, Cr2O3, and V2O3 to 50 kbars Journal of Applied Physics 51 5362-5367 | 1980 | synthetic | 4.16 | 293 | |
| 0017735 | Hematite | Finger L W, Hazen R M (1980) Crystal structure and isothermal compression of Fe2O3, Cr2O3, and V2O3 to 50 kbars Journal of Applied Physics 51 5362-5367 | 1980 | synthetic | 4.39 | 293 | |
| 0017736 | Hematite | Finger L W, Hazen R M (1980) Crystal structure and isothermal compression of Fe2O3, Cr2O3, and V2O3 to 50 kbars Journal of Applied Physics 51 5362-5367 | 1980 | synthetic | 5.24 | 293 | |
| 0014076 | Hematite | Pauling L, Hendricks S B (1925) Crystal structures of hematite and corundum Journal of the American Chemical Society 47 781-790 | 1925 | 0 | 293 | ||
| 0018106 | Hematite | Pauling L, Hendricks S (1925) The Structure of Hematite Journal of the American Chemical Society 47 781-790 | 1925 | 0 | 293 |
CIF Raw Data - click here to close
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.
Pencil Ore in petrology
An essential component of rock names highlighted in red, an accessory component in rock names highlighted in green.
- Igneous rock
- Sedimentary rock and sediment
- Sediment
- Sedimentary rock
- Biochemical and chemical sedimentary rock
- Concretion
- Ironstone
- Siliceous-rock
- Biochemical and chemical sedimentary rock
- Metamorphic rock
- Meteorite and other extra-terrestrial rock and sediment
- Superficial deposit
Internet Links for Pencil Ore
mindat.org URL:
https://www.mindat.org/min-5487.html
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References for Pencil Ore
Significant localities for Pencil Ore
Showing 55 significant localities out of 24,607 recorded on mindat.org.
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.
Argentina | |
| [Hematite var: Martite] Raúl Jorge Tauber Larry´s collection |
Austria | |
| [Hematite] Strasser (1989) |
Bolivia | |
| [Graphite] Petrov (n.d.) |
Canada | |
| [Graphite] 181. +3 other references |
| [Graphite] RWMW specimen +2 other references |
| [Graphite] Graphitologie. Louis Coupal. Montreal |
Chile | |
| [Hematite var: Specularite] Maskaev et al. (2007) |
France | |
| [Hematite] Mboungou-Kongo (2002) |
| [Hematite] Wittern et al. (1997) |
| [Hematite] Les Minéraux de Sainte Marie-aux-Mines |
| [Hematite] Favreau G. et al. (2004) |
Ireland | |
| [Hematite var: Specularite] Flannery (n.d.) |
Italy | [Hematite] |
| [Hematite] Piccoli (2002) +1 other reference |
| [Hematite var: Iron Rose] Giacomino et al. (1986) +1 other reference |
| [Hematite var: Iron Rose] Giacomino et al. (1986) +1 other reference |
| [Hematite] E. Grill (1911) |
| [Hematite] Garofalo et al. (2025) | |
| [Hematite] Orlandi +2 other references | |
| [Hematite] Orlandi P. et al. (LU) |
| [Hematite] Dini A. et al. (1997) |
Morocco | |
| [Hematite] Favreau et al. (2006) |
Norway | |
| [Hematite] Vogt (1892) +1 other reference |
Russia | |
| [Graphite] Pavel.M. Kartashov (n.d.) +2 other references |
| [Graphite] Pavel.M. Kartashov (n.d.) +2 other references |
Spain | |
| [Hematite] Romero Silva (2003) +2 other references |
| [Hematite] Calvo (2008) |
| [Hematite] Fuertes Acevedo (1884) +1 other reference |
| [Hematite] Calvo (2009) |
Switzerland | |
| [Hematite] Kipfer (1974) +1 other reference |
Tanzania | |
| [Graphite] John A. Jaszczak collection #2941 |
| [Graphite] C. Lemanski +2 other references |
UK | |
| [Hematite] Fluorite: The Collector's Choice. Extra ... |
| [Hematite] |
USA | |
| [Hematite] Anthony et al. (1995) |
| [Hematite] self-collected by C. Lemanski |
| [Hematite] - (2005) |
| [Hematite] Cristofono (n.d.) |
| [Graphite] Gates (1961) |
| [Graphite] Brace (1819) +2 other references | |
| [Graphite] Williams (circa 1945) |
| [Hematite] Powell (1987) |
| [Hematite] Chris Van Laer Collection |
| [Graphite] Palache (1935) +4 other references |
| [Graphite] A Quest for New Jersey Minerals (1978) +2 other references |
| [Hematite] Brighton Alfred Collection. |
| [Graphite] Rhein Collection |
| [Graphite] Rocks & Min.:7:81. +1 other reference |
| [Graphite] Miller (1971) |
| [Hematite] Michael W. Kieron collection |
| [Graphite] Miller. C. E. (1971) |
Saint-Christophe-en-Oisans, Grenoble, Isère, Auvergne-Rhône-Alpes, France