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   Franklin Marble                                            Page 1

 

   The Franklin Marble is exposed in a continuous band from Sterling

    Hill in Ogdensburg, Sussex County, NJ to Mount Adam and Mount

    Eve in Warwick, Orange County, NY. The marble is host to the

    world famous zinc ore bodies at Franklin and Sterling Hill where

    over 350 different mineral species occur. Other 'classic' mineral

    localities, such as the spinel localities in Orange County, NY, are

    also found in the Franklin Marble. It is part of a metamorphosed

    sedimentary sequence of Grenville age, about 900 million to one

    billion years old, located on the northwestern edge of the Reading

    Prong geologic province of New York, New Jersey and Pennsyl-

    vania. The marble itself is a highly metamorphosed limestone

    (sillimanite grade) and is a well known producer of collectible

    specimens of metamorphic minerals including the largest spinels

    from North America.  The specimens pictured here come from a

    variety of localities in the marble except the zinc mines of  Frank-

    lin and Sterling Hill which merit separate attention due to the large

    variety and unusual nature of the minerals found in them.

      

                                                                                                              

Mineral Specimens - Clintonite, Amity, Orange County, NY

 

  M1146

  CLINTONITE, CHONDRODITE,

  DIOPSIDE

  Amity, Orange County, NY, USA

  Bronze colored clintonite, a brittle mica, in

  brecciated orange chondrodite, violet titanium-

  rich diopside

 

 Specimen size -  approx.  10.5 cm.  X  8.0 cm.  X  2.5 cm.

 

Mineral Specimens - Arsenopyrite, Warwick, Orange County, NY

  M1884                        

 ARSENOPYRITE

 Warwick, Orange County, NY, USA 

  Silver arsenopyrite crystals in a mixed mica,

  pyroxene matrix.

 

 

 

 

 Specimen size - approx. 6.0 cm.  X   3.8 cm.  X  2.8 cm.

 

Mineral Specimens - Spinel, Amity, Orange County, NY

                                                                        

  M1738                        

  SPINEL

  Amity, Orange County, NY, USA 

  Cluster of black spinel octahedra with minor

  phlogopite and pyroxene.

 

 

 

Mineral Specimens - Spinel, Amity, Orange County, NY

 

 

 

 

 

 

 

 

 

 Specimen size  - approx. 15.0 cm.  X  10.0 cm.  X  7.0 cm.

 

 Mineral Specimens - Zircon, Amity, Orange County, NY

  M1585                        

  ZIRCON

  Amity, Orange County, NY, USA 

  Brown zircon crystals with graphite in

  diopside/scapolite rock at marble contact.

  

 

 

 Specimen size  - approx. 12.0 cm.  X  8.5 cm.  X  5.5 cm.

     

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