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About JeffersoniteHide

Dark olive green to dark brown
Resinous, Waxy, Sub-Metallic, Dull
4½ - 5
Specific Gravity:
3.51 - 3.55
Named in 1822 by Lardner Vanuxem and William Hipolytus Keating in honor of Thomas Jefferson, naturalist and politician, former president of the USA, but the honoree was not stated in the description. However, Thomas Jefferson acknowledged the honor to Keating: "Monticello July 18.22. I thank you, Sir, for the Account of the new mineral discovered by yourself and mr Vanuxem, of which you have been so kind as to send me a copy, and more particularly for the honor done my name by the appellation given it. age and a decayed memory have very much weakened my attention to the physical sciences, but nothing can ever weaken my affection to them, and the pleasure with which I observe so many of my young countrymen pursuing them with an ardor & success equally honorable to themselves & our country. permit me to place here my friendly recollections of mr Vanuxem with assurances to yourself of my high esteem and respect.
Th: Jefferson."
A Zn- and Mn-bearing variety of augite, a clinopyroxene.

Originally described from Passaic Pit (Marshall Mine; Passaic Mine), Sterling Hill, Ogdensburg, Franklin Mining District, Sussex Co., New Jersey, USA.

Physical Properties of JeffersoniteHide

Resinous, Waxy, Sub-Metallic, Dull
Dark olive green to dark brown
Light green
4½ - 5 on Mohs scale
Softer when leached
Very Good
3.51 - 3.55 g/cm3 (Measured)    

Chemical Properties of JeffersoniteHide


First Recorded Occurrence of JeffersoniteHide

Geological Setting of First Recorded Material:
Highly metamorphose marble containing zinc minerals.
Associated Minerals at First Recorded Locality:

Other Language Names for JeffersoniteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
2 photos of Jeffersonite associated with CalciteCaCO3
1 photo of Jeffersonite associated with Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
1 photo of Jeffersonite associated with AndraditeCa3Fe3+2(SiO4)3
1 photo of Jeffersonite associated with Edenite{Na}{Ca2}{Mg5}(AlSi7O22)(OH)2

Fluorescence of JeffersoniteHide

Not fluorescent in UV

Other InformationHide

Thermal Behaviour:
Fuses readily
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for JeffersoniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Vanuxem, Lardner and Keating, William H. (1822) Account of the Jeffersonite, a new Mineral Discovered at the Franklin Iron Works, near Sparta in New-Jersey, Journal of the Academy of Natural sciences of Philadelphia, v. 2, p. 194-204.

Internet Links for JeffersoniteHide

Localities for JeffersoniteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
  • South Australia
    • Olary Province
      • Mt Victor Plumbago Station
Record of Mines-Summary Card No:60
No reference listed
  • Örebro County
    • Ljusnarsberg
      • Kopparberg
  • Sughd
    • Kuraminskii Range
      • Altyn-Topkan ore field
Evseev, A. A. (1995) Kazaknstan and Middle Asia. A brief Mineralogical Guide. World of Stone 8:24-30
  • New Jersey
    • Sussex Co.
      • Franklin Mining District
Van King
        • Ogdensburg
Vanuxem, Lardner and Keating, William H. (1822) Account of the Jeffersonite, a new Mineral Discovered at the Franklin Iron Works, near Sparta in New-Jersey, Journal of the Academy of Natural sciences of Philadelphia, v. 2, p. 194-204.
Leavens, P. B., Zullo, J., & Verbeek, E. (2009). A complex, genthelvite-bearing skarn from the Passaic pit, Sterling Hill mine, Ogdensburg, New Jersey. Axis, 5, 26.
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