David K. Joyce

Cobalt/Gowganda, Allargentum

Well, allargentum is not a common mineral! It looks very much like silver but, unlike silver, it has cleavage. Silver does not! At Cobalt, allargentum occurs in masses and as lamellae in native silver. These are excellent examples that show nice cleavages in veinlets of allargentum and, probably silver. Note the triangular cleavage markings. Rare!

All prices in Canadian dollars. For payment in US$, deduct 24% or multiply by 0.76.

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Allargentum, SilverCobalt/Gowganda, Allargentum
  • Item #27021
  • Allargentum, Silver
  • 1.3x1.0x0,9 cm
  • Largest Crystal Size: 4mm cleavages
  • $40.00
  • Kerr Lake Mine
  • Cobalt
    Ontario, Canada
  • Well, allargentum is not a common mineral! It looks very much like silver but, unlike silver, it has cleavage. Silver does not! At Cobalt, allargentum occurs in masses and as lamellae in native silver. Here is an excellent example that shows a nice cleavage and lots of smaller ones in a veinlet of allargentum and, probably silver. Note the triangular cleavage markings. Rare!
Allargentum, SilverCobalt/Gowganda, Allargentum
  • Item #27022
  • Allargentum, Silver
  • 2.0x1.8x0.9 cm
  • Largest Crystal Size: n/a
  • $40.00
  • Kerr Lake Mine
  • Cobalt
    Ontario, Canada
  • Well, allargentum is not a common mineral! It looks very much like silver but, unlike silver, it has cleavage. Silver does not! At Cobalt, allargentum occurs in masses and as lamellae in native silver. Note the triangular cleavage markings on many of them. This piece is solid allargentum/silver that shows some cleavages of allargentum in allargentum or as lammellae in silver. Rich and unusual! Rare!
Allargentum, SilverCobalt/Gowganda, Allargentum
  • Item #27024
  • Allargentum, Silver
  • 1.7x1.4x1.3 cm
  • Largest Crystal Size: n/a
  • $40.00
  • Kerr Lake Mine
  • Cobalt
    Ontario, Canada
  • Well, allargentum is not a common mineral! It looks very much like silver but, unlike silver, it has cleavage. Silver does not! At Cobalt, allargentum occurs in masses and as lamellae in native silver. Note the triangular cleavage markings on many of them. Rare! This allargentum appears to have been torqued during breakage and shows lots of small cleavage planes on one side. Rich!