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   Jeffrey Mine, Black Lake Mine                           Page 1

   The asbestos deposits in Quebec are interpreted as part of an

    'ophiolite sequence', sheets of oceanic crust smashed up against

    the North American continent during a continental collision in

    the Taconic orogeny about 490 million years ago. Hot water

    circulated through the pyroxene and olivine rich ultramafic rocks

    in the sequence during this process, transforming those minerals

    into serpentine. The fibrous form of serpentine, chrysotile, was

    deposited in fractures in the ultramafic rocks as cross fiber veins

    where the chrysotile fibers occur at a high angle to the vein walls,

    or as slip fiber veins where the fibers occur parallel to the vein

    walls. The veins may be up to four inches thick. The mines devel-

    oped in the deposits are world famous for grossular and vesuvian-

    ite specimens. They also produce extraordinary pectolite, prehnite,

    diopside, and brucite. These pages include a variety of specimens

    from the mines at Asbestos and Black Lake.

   M1564                           

  GROSSULAR

  Jeffrey Mine,

  Asbestos, Quebec, Canada

  Transparent grossular crystals on granitic

  matrix. 

.

 Specimen size -  approx.  12.5 cm.  X  7.0 cm.  X  5.0 cm.

  M1716                      

  SERPENTINE after AMPHIBOLE 

  Jeffrey Mine,

  Asbestos, Quebec, Canada

   A 'hornblende' crystal replaced by serpentine.

 Specimen size -  approx.  2.5 cm.  X  1.7 cm.  X  1.5 cm.

  M1978                        

 VESUVIANITE

 Jeffrey Mine,

 Asbestos, Quebec, Canada

 A 'cross' of vesuvianite.

 Specimen size - approx. 3.8 cm.  X   2.9 cm.  X  2.3 cm.

 M0743                       

 GROSSULAR

 Jeffrey Mine,

 Asbestos, Quebec, Canada

 A cluster of gemmy, green grossular dodeca-

 hedra.

 Specimen size - approx. 3.5 cm.  X  3.0 cm.  X  2.0 cm.

       Sorry, the mineral specimens on this page are not for sale. Click here to see Jeffrey Mine & Black Lake minerals for sale

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