A sizable and well crystalized red-brown Richterite from Langban that is outstanding for this classic locality. Ex John Marshall collection he obtained it in 1992. His collection card notes that he showed it to Carl Francis who said it was "considerably better than the two specimens at Harvard in the Langban case. I checked and it is" He also notes he felt it "equivalent to the specimen on display at the British Museum". All that said there are larger crystals known from several other locales, but this color and habit seem to be unique to Langban, all the other worldwide specimens are black, colorless or a light yellow. Langban minerals tend to be a bit ugly, or microscopic, this is actually a displayable, cabinet sized crystal specimen. Though not an ultra showy, pretty mineral, this is a significant and fine specimen. Crystals to 1.6 CM, there is some damage but also several complete crystals, the smallest are transparent.
Cobaltite -classic locale
5.8 x 4.3 x 3.4 CM (small cabinet/ large miniature)
Worldwide mix summer
An excellent sharp Swedish Cobaltite crystal on typical matrix block of mixed Sulfides (Chalcopyrite etc). The Cobaltite is a modified cube (8MM) with distinct striations and fine metallic luster that is mirror bright as seen. Looks fine by eye, but the cube has a corner contact at one edge seen with magnification and there is a small crack in the crystal not visible without 10x magnification. That said this is far better than average and as near to perfect as we have seen. These are not common and in this quality very rare, often quite pricy.
Sharp Fluorites from the classic Malmberget locality, famed for butterfly twin Calcites. Less famed but still excellent are the Fluorites and Stilbites from here. An excellent example in very good condition as seen with several mint green octahedral crystals. The main Quartz is about 2 CM tall and well decorated by bright Chalcopyrites, adding a nice contrast and luster. No damage seen by naked eye, some tiny chips can be found with 20X magnification, so very close but not quite perfect. A modern classic locale, these FLUORITES ARE NOT OFTEN AVAILABLE
Cobaltite - Modified Cubic crystal
3.6 x 2.4 x 2 CM (small miniature/ large thumbnail (toenail))
Pre Holiday 2017
A sharp 9 MM metallic silver crystal with clear edge modifications perched in matrix. An older specimen from this classic location that has produced perhaps the best ever crystals for the specie. Some minor sulfide overgrowths are seen and the crystal has retained the bright luster that makes these so distinctive. Could easily be trimmed to make a thumbnail if desired. A good example well crystallized for this often damaged specie that is also affordable.
Very fine, sharp bi-colored Stilbites from the Malmberget Mine that is world famed for a great find of gemmy Calcite. This is a rather old specimen with a few very small near colorless Fluorites and associated minerals. The Stilbites are quite sharply terminated reaching over 2 CM long and with bright luster. In excellent condition, no visible damage.
An incredible Swedish Rhodonite with excellent color, sharp crystals and fine pedigree. Ex University of Chicago collection with original label noting this was a donation by George English, likely well over 100 years ago. Several crystal lined vugs are on the matrix, the largest being 5.5 CM across. Some broken crystals are noted but not very evident without magnification, overall the condition is quite good especially given the age of this piece. From a small but noted old Iron mine, there are some tiny orange garnet crystals (likely Grossular), Diopside and an unidentified black mineral in the mix. We have not seen another with such good esthetics and the color is a rich red and not the typical pink.
A sizable old location piece with a Dr. Krantz in Bonn label (a little different than most Krantz labels we have seen) there are several sharp octaherdral crystals etched from a calcite matrix. This is not a highly esthetic piece but it is a classic vintage and it does show the blue to purple octahedrons well.