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   Tilly Foster Mine                                           Page 1

 

   The Tilly Foster Mine was developed in a magnetite deposit in

    gneiss located on the northeastern edge of the Hudson Highlands

    geologic province, an extension of the Reading Prong of New

    Jersey and Pennsylvania. The province is interpreted as a meta-

    morphosed sedimentary sequence representing the cores of

    mountains formed by a continental collision during the Grenville

    orogeny, some 900 million to one billion years ago. Operated from

    the 1850's to 1895, the mine produced a low phosphorus iron ore

    well suited to making Bessemer steel. After an 1895 accident in

    which 13 miners were killed, the mine was closed. Tilly Foster was

    noted for chondrodite (some of the world's best), clinochlore,

    dodecahedral magnetite, and brucite specimens. Serpentine

    pseudomorphs are classic Tilly specimens and the yellow titanite

    specimens from Tilly are rare and highly sought after.

 

  Mineral Specimens - Titanite, Tilly Foster Mine, Brewster, NY                                                                                                                     

   M1602                           

  TITANITE

  Tilly Foster Mine,

  Brewster,  NY, USA

  Gemmy yellow titanite crystal in calcite

  cleavage with minor clinochlore.

 

.

Mineral Specimens - Titanite, Tilly Foster Mine, Brewster, NY

 

 

 

 

 

 

 

 

 

 Specimen size -  approx.  6.5 cm.  X  6.2 cm.  X  3.0 cm.

 

 Mineral Specimens - Brucite, Tilly Foster Mine, Brewster, NY

  M1591                      

  BRUCITE 

  Tilly Foster Mine,

  Brewster, NY, USA

   Pale green and white brucite crystals in a

   seam in lean gneissic magnetite ore. This

   brucite does not fluoresce.

  

 Specimen size -  approx.  12.5 cm.  X  9.0 cm.  X  7.0 cm.

 

 Mineral Specimens - Magnetite, Tilly Foster Mine, Brewster, NY

  M0808                        

 MAGNETITE

 Tilly Foster Mine,

 Brewster, NY, USA

  Large dodecahedral magnetite crystal with

  small clinochlore crystals on lean magnetite,

  chondrodite ore.

 

 Specimen size - approx. 7.3 cm.  X   4.7 cm.  X  4.5 cm.

                                                                        

Mineral Specimens - Magnetite, Chondrodite, Tilly Foster Mine, Brewster, NY

 M0743                       

 MAGNETITE, CHONDRODITE

 Tilly Foster Mine,

 Brewster, NY, USA

 Small dodecahedral magnetite cystals, chondrodite

 crystals on gneissic magnetite, chondrodite ore.

 

 

 

 Specimen size - approx. 5.5 cm.  X  5.5 cm.  X  4.3 cm.

 

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