David K. Joyce Minerals

Jeffrey Mine, Asbestos, Quebec, Prehnite

The Johns-Manville Company started the modern version of the Jeffrey Mine in 1918 and until recently, under different ownership, the Jeffrey Mine operated on what is the largest asbestos orebody in the western world. Unfortunately, due to health concerns and asbestos substitution and declining prices, the Jeffrey Mine is now closed. It is controversial as to what extent asbestos is a hazardous material. What is not controversial is the large volume of magnificent crystals and species that were produced over the decades. I recently was able to obtain some excellent specimens, particularly pectolite and prehnite from an old cache. Like real estate, "They aren't making any more".

All prices in Canadian dollars. For payment in US$, deduct 19% or multiply by 0.81.

Click on any of the following thumbnails to view a larger image of the specimen.

PrehniteJeffrey Mine, Asbestos, Quebec, Prehnite
  • Item #4011
  • Prehnite
  • 5.1x4.3x3.2 cm
  • Largest Crystal Size: 8mm
  • $25.00
  • Jeffrey Mine
  • Asbestos
    Quebec, Canada
  • This specimen has a number of white, tapering, terminated prehnite prisms scattered around the front of it. The rest of the specimen is cmposed of tiny dodecahedra of grossular, mostly iron oxide encrusted. Displays well.
Prehnite, DiopsideJeffrey Mine, Asbestos, Quebec, Prehnite
  • Item #11890
  • Prehnite, Diopside
  • 10.0x7.2x2.7 cm
  • Largest Crystal Size: d&p -11mm
  • $225.00
  • Jeffrey Mine
  • Asbestos
    Quebec, Canada
  • There is one well-formed, curved beige crystal of prehnite on this plate of prismatic, green diopside crystals. The diopside is not perfect, mostly is, bit the prehnite is! Displays well.
PrehniteJeffrey Mine, Asbestos, Quebec, Prehnite
  • Item #15116
  • Prehnite
  • 3.7x2.4x1.5 cm
  • Largest Crystal Size: 21mm
  • $55.00
  • Jeffrey Mine
  • Asbestos
    Quebec, Canada
  • A top prehnite crystal with some partial crystals attached. The main crystal shows sharp, frosted prism faces and a lustrous, concave termination. That termination is hard to photograph since it is curved! Very nice example!
Prehnite, DiopsideJeffrey Mine, Asbestos, Quebec, Prehnite
  • Item #11870
  • Prehnite, Diopside
  • 2.2x2.2x1.6 cm
  • Largest Crystal Size: p-15mm, d-10mm
  • $35.00
  • Jeffrey Mine
  • Asbestos
    Quebec, Canada
  • This good-looking, sort of stepped prehnite crystal is nestled amongst gray, acicular diopside crystals. A great example of this mineral. Different!
PrehniteJeffrey Mine, Asbestos, Quebec, Prehnite
  • Item #16082
  • Prehnite
  • 7.2x4.8x4.0 cm
  • Largest Crystal Size: 22mm
  • $75.00
  • Jeffrey Mine
  • Asbestos
    Quebec, Canada
  • This white matrix displays several well formed, very light greenish crystals of prehnite. One prehnite crystal is quite large at 22mm across! I don't know what the white is but in cavities, it appears to be a white, bladed mineral similar to albite or pectolite. This specimen could be displayed vertically, as well. Excellent specimen of prehnite!
PrehniteJeffrey Mine, Asbestos, Quebec, Prehnite
  • Item #16052
  • Prehnite
  • 3.1x0.8x0.75 cm
  • Largest Crystal Size: as above
  • $35.00
  • Jeffrey Mine
  • Asbestos
    Quebec, Canada
  • This is a well formed, single crystal of prehnite. The crystal is doubly terminated and has just a small single point of attachment on a portion of the bottom termination. Excellent!