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 18% or multiply by 0.82.

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

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.
PrehniteJeffrey Mine, Asbestos, Quebec, Prehnite
  • Item #22839
  • Prehnite
  • 6.0x3.7x4.3 cm
  • Largest Crystal Size: 35mm
  • $85.00
  • Jeffrey Mine
  • Asbestos
    Quebec, Canada
  • A cluster of rather large, blocky crystals of off-whitish prehnite crystals. The big crystal is particularly interesting with a kind of curved, multiple termination that we often see in prehnite. Just large! R
Prehnite, DiopsideJeffrey Mine, Asbestos, Quebec, Prehnite
  • Item #27893
  • Prehnite, Diopside
  • 9.4x7.2x3.2 cm
  • Largest Crystal Size: p-12mm
  • $75.00
  • Jeffrey Mine
  • Asbestos (Val des Sources)
    Quebec, Canada
  • This plate of crystals is composed of creamy-white, blocky prehnite crystals with gray-green diopside crystals shooting through them. The diopside crystals have feathery terminations or are broken off. The stars of the specimen are the blocky, prismatic, prehnite crystals. Very sharp with diaconal; stria. Excellent for this mineral.
PrehniteJeffrey Mine, Asbestos, Quebec, Prehnite
  • Item #27943
  • Prehnite
  • 6.7x6.0x2.9 cm
  • Largest Crystal Size: 23mm
  • $85.00
  • Jeffrey Mine
  • Asbestos (Val des Sources)
    Quebec, Canada
  • This plate has several, light, waxy-green prehnite crystals in the middle. The crystals are HUGE for this mineral being up to 23mm in length and 15mm on-edge in square cross section. Excellent prehnite!