David K. Joyce Minerals

Cobalt/Gowganda, Ontario -Various Species

Although Cobalt was famous for the vast quantities of silver mined there over many decades, many other minerals, some fairly rare, have been found there in impressive specimens, confirmed by electron microprobe analysis. Here are some.

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.

NickelineCobalt/Gowganda, Ontario -Various Species
  • Item #17905
  • Nickeline
  • 8.5x7x3.6 cm
  • Largest Crystal Size: n/a
  • $75.00
  • Cobalt
    Ontario, Canada
  • This piece is almost solid nickeline, associated with coarsely crystallized calcite. Doesn't get much richer or heavier as a nickeline specimen!
Skutterudite, ArsenopyriteCobalt/Gowganda, Ontario -Various Species
  • Item #18023
  • Skutterudite, Arsenopyrite
  • 9.0x8.8x6.0 cm
  • Largest Crystal Size: 11mm
  • $150.00
  • Hudbay (Rustex) Mine
  • Gowganda
    Ontario, Canada
  • The top of this specimen reveals an opening exposed by etching calcite away. The opening is lined with sharp, classic crystals of skutterudite showing typically lop-sided cubes with smaller cube-octahedral crystals of skutterudite on the bigger faces. Really an excellent specimen of this mineral from a classic location! Some tiny arsenopyrite crystals are scattered around. Shows well!
SkutteruditeCobalt/Gowganda, Ontario -Various Species
  • Item #17060
  • Skutterudite
  • 7.5x3.7x2.7 cm
  • Largest Crystal Size: <1mm
  • $40.00
  • Green Meehan mine
  • Cobalt
    Ontario, Canada
  • Colloidal groupings of skutterudite that some of which, I think, are actually pseudomorphs after a previous arsenide mineral. Nice looking piece!
SideriteCobalt/Gowganda, Ontario -Various Species
  • Item #17121
  • Siderite
  • 6.4x6.7x3.8 cm
  • Largest Crystal Size: 1mm
  • $65.00
  • Cobalt
    Ontario, Canada
  • A vein of solid cobaltite cuts through diabase country rock, in this specimen. The siderite vein has some open spaces which are lined with lustrous, siderite rhombohedra. Unique!
Skutterudite, Safflorite, ArsenopyriteCobalt/Gowganda, Ontario -Various Species
  • Item #19895
  • Skutterudite, Safflorite, Arsenopyrite
  • 10.8x6.6x5.3 cm
  • Largest Crystal Size: 10mm
  • $160.00
  • Nipissing 404 Mine
  • Cobalt
    Ontario, Canada
  • The vug on the top of this specimen has had the calcite removed to reveal very sharp crystals of skutterudite, showing various combinations of cube and octahedron. The skutterudite crystals are sometimes overgrown by safflorite or tiny arsenopyrite crystals but most of the time are just sharp skutterudite crystals. Dense. Excellent! Displays perfectly.
Silver, SaffloriteCobalt/Gowganda, Ontario -Various Species
  • Item #19902
  • Silver, Safflorite
  • 3.8x3.2x3.0 cm
  • Largest Crystal Size: n/a
  • $65.00
  • Hudson Bay(Rustex) Mine
  • Gowganda
    Ontario, Canada
  • This specimen is a vein section that has dolomite on one side and calcite in the middle. Some of the calcite has been etched way to better reveal the botryoidal safflorite that has silver splashed between the botryoids or in veinlets in the dolomite. Interesting and rich!
Proustite, Silver, ArsenidesCobalt/Gowganda, Ontario -Various Species
  • Item #20191
  • Proustite, Silver, Arsenides
  • 12.6x4.5x3.4 cm
  • Largest Crystal Size: n/a
  • $160.00
  • Silverfields Mine
  • Cobalt
    Ontario, Canada
  • A section of silver vein that shows a vein of silver with a parallel vein of proustite "ruby Silver" on one side. We don't often see proustite like this at cobalt. The proustite is the uppermost mineralization in the photo's. Sawn on one side and rough on the other side.