David K. Joyce

Greenland Minerals, Cuprostibite, Kangerdluarssuk, Ilimaussaq

Cuprostibite is a very rare mineral and the Ilimaussaq alkaline intrusive complex is one of the most prolific localities. This unique minerals is one of the few thallium minerals to be found in nature. There is more or less native copper in many of the samples, intimately associated with the Cuprostibite. Any green that you see is antimony-rich malachite, while blue is connelite. Here are some very good examples.

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Thomsenolite, Siderite, Sphalerite, RalstoniteGreenland Minerals, Cuprostibite, Kangerdluarssuk, Ilimaussaq
  • Item #20931
  • Thomsenolite, Siderite, Sphalerite, Ralstonite
  • 12.4x9.0x7.5 cm
  • Largest Crystal Size: 6mm
  • $425.00
  • Ivigtut Deposit
  • Ivittuut, Arsuk Fjord
    Greenland
  • There are cavities all over this specimen that are lined with superb, elongated, terminated thomsenolite crystals. Of course as is usually the case, the thomsenolite is white but has a light coating of iron oxide that give the specimen its classic look. Matrix appears to me massive thomsenolite with a few small siderite and sphalerite crystals embedded in it. As well, there are small cube-octahedral ralstonite crystals on the thomsenolite crystals, inside the vugs. We don't seem much of this material around any more!