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   Franklin and Sterling Mines                                  Page 1

 

      The Franklin Mine on Mine Hill in Franklin and the Sterling Mine

    on Sterling Hill in Ogdensburg exploited two large separate but very

    similar, unique zinc ore deposits. These ancient deposits are located in

    the Franklin Marble along the northwestern edge of the New Jersey

    highlands in Sussex County, NJ. The main zinc ore minerals, franklinite,

    willemite, and zincite, are not found as ore in any other zinc deposits.

    The great age of these deposits, about 900 million to a billion years in

    age, and the unusual nature of the ores along with their subsequent

    geochemical and geologic history have combined to produce a suite

    of minerals rivaled by only a handful of other localities worldwide.

    Many minerals were first scientifically described from these deposits

    and some are known to occur here only. Some are very rare. The

    spectacular fluorescent mineral specimens found here are arguably

    the best in the world in terms of variety, patterns, combinations, and

    strength of colors that happen when these rocks are exposed to ultra-

    violet light. The area is truly 'the fluorescent mineral capital of the

    world'.

        While much mineralogical history was made in the Franklin district,

    mineralogy is just one aspect of what made Franklin famous. Precedents

    in mining law were set here, advances in mining techniques and tech-

    nology were made, and innovative industrial and ore refining processes

    were created here. The wealth created by these unique ore bodies be-

    came the capital used to exploit other mineral deposits. These pages

    contain some examples of the mineral specimens that were found in

    these great zinc mines. Please see the links page for further information

    on the world famous zinc deposits of Franklin and Ogdensburg, NJ. 

 

   

Mineral Specimens - Calcite, willemite, Franklin, NJ

 

  16B01

  CALCITE, WILLEMITE - 'COLOR'

  NJ Plant #2 site (Mill site)

  Franklin, Sussex Co., NJ, USA

  Franklin 'color' - the rock that made Franklin famous.

  Specimen size: approx. 12.5 cm X 9.7 cm X 9.5 cm.

 

 

 

 

 

Mineral Specimens - Calcite, willemite, Franklin, NJ

 

 

 

 

 

 

 

 

 

 

 

 

     NATIVE ELEMENTS

   

Mineral Specimens - Copper, Franklin, NJ

 

  M0876

  COPPER

  Franklin, Sussex Co., NJ, USA

 Copper crystals on hancockite with datolite.

 The crystals are shells around cores of datolite

 which can be seen in the broken crystal in the

 foreground. Copper crystals are rare at

 Franklin and these, at roughly a quarter inch,

 

   are larger than most. For those interested in Franklin history, this appears to be an occurrence mentioned by Palache,

   citing an example from the Shuster collection, under a discussion on copper crystal habit at Franklin.

   (Photo by Gary Grenier)

   Specimen size: approx. 4.4 cm  X  4.4 cm  X  3.8 cm

 

 

Mineral Specimens - Copper, Franklin, NJ

 

  M0449

  COPPER

  Franklin, Sussex Co., NJ, USA

  Sheets of native copper imbedded in typ-

   ical Franklin ore consisting of  franklinite,

   green willemite, and zincite. While not rare,

   native copper is uncommon from Franklin

   and good specimens are very collectible.  

 

   (Photo by Gary Grenier)

   Specimen size: approx. 6.9 cm  X  3.8 cm  X  3.8 cm

 

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