Copper -chain of Spinel twins
Proprietary Mine, Broken Hill, Yancowinna County
New South Wales,
5.2 x .8 x .4 CM (small cabinet/ large miniature)
A perfect elongated spinel twin crystal forms the base for radiating smaller spinel twins that are epitaxially oriented. In pristine, undamaged condition this is a really unusual choice old Broken Hill (Australia) piece. The secondary crystals are mostly oriented in two lines or chains some of which form mirror copies of each other. The smaller crystals reach 1 CM and all have textbook perfect forms.
Cliff Mine, Pheonix, Keweenaw County
16.1 x 2 x .5 CM (cabinet)
An antique native copper "finger" or "fan blade" made by skilled hand chiseling long ago. These artifacts were made by miners from the often huge masses of pure Copper encountered in the Upper Penninsula of Michigan. From the John Marshall collection, this is recorded as from the Cliff Mine, such attributions of these artifacts are quite uncommon. Aside from the very hard labor of hammering through solid copper, these fingers required a lot of skill to create such a long straight and clean blade. While not a typical mineral specimen this is a very much a classic Native Copper that has had a major trimming job!
Chain-like stack of arborescent and spinel twin crystals from New Mexico. Ex collections of Buck Keller and William Hladysz, this has just a hint of matrix adhering, but is mostly a sculptural tower of Copper. No damage and with a nice patina, this is an older piece that predates the Chino mine find that became famous in 2001. This piece almost certainly came from the Chino mine zone too, but that is not recorded on the previous label and we do not like to attribute without certainty. The Chino is a huge pit that has now encompassed other smaller mines, so many details of locality have gotten lost over time. A very nice copper from anyplace.
Copper -spinel twinned
Emke Mine, Onganja, Seiis
3.9 x 1.2 x .4 CM (miniature)
A spire of interlocked spinel twin Copper crystals with side branches and sharp terminations. From the now classic, closed Emke mine at Oganja, this is the style and habit that are distinctive for this locale. No damage, nice patina and especially nice under magnification. Larger examples from this locale are highly desired and now very expensive. This is a choice smaller piece that is perfect and affordable. .
Sharp replacement of hexagonal Aragonite crystals by native copper. Excellent form, complete on all sides and with classic hexagonal prisms. Slightly hoppered on flat faces, this is formed of two textbook prisms that intersect on one narrow edge. Usually these pseudos are rather crude, it is very special when such sharp detail is preserved.
Copper with Cuprite
Ray Mine, Ray District, Dripping Springs Mountain, Pinal county
6.1 x 5.7 x 4.9 CM (cabinet)
Worldwide mix summer
A thin fan like sheet and branching Copper crystals that is partly coated with Cuprite. The Cuprite is in epitaxial crystals and flattened on the Copper. From the Ray mine where many fine Coppers were found, this example is illustrative of the thin vein fillings and coatings that were so significant there. In fine condition and a colorful example, some secondary Copper oxides add a green color to contrast the red Cuprite and metallic Copper hues.
Copper- twinned crystals
Itauz Mine, Zhilandy group
5.5 x .9 x .4 CM (small cabinet/ large miniature)
Complex twinned crystals in a branching display with fine patina. No damage, a choice example of the great spinel twin habits that have been found in Kazakstan. Looks fine on all sides, a very good value.
Copper with Quartz
Onganja Mine, Windhoek District
5.1 x 2.8 x 1.7 CM (miniature)
A crystallized sculpture of Copper from the famed Onganja mine that has several crystallized Quartz clusters perched. In fine condition, the Quartz seems to have formed on a Calcite core. A rare association, the tiny Quartz crystals are very clear, adding a sparkling accent. The Copper is in branching crystals with some showing crude spinel twinning and flattened, stretched octahedrons. Quartz is not a common association in these coppers.