David K. Joyce

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 23% or multiply by 0.77.

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 #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 #20698
  • Prehnite
  • 9.1x7.2x5.3 cm
  • Largest Crystal Size: 17mm
  • $110.00
  • Jeffrey Mine
  • Asbestos
    Quebec, Canada
  • Some very nice crystals of prehnite on this specimen. From the long closed, famous Jeffrey Mine. These don't come around like this very often.
Prehnite, Chlorite, GrossularJeffrey Mine, Asbestos, Quebec, Prehnite
  • Item #22146
  • Prehnite, Chlorite, Grossular
  • 4.2x3.7x2.8 cm
  • Largest Crystal Size: p-9mm
  • $40.00
  • Jeffrey Mine
  • Asbestos
    Quebec, Canada
  • Classic association from the Jeffrey Mine. Very sharp, elongated, white prehnite crystals with flat terminations, associated with rounded aggregates of a chlorite mineral and gemmy grossular crystals.