This specimen of ojuelaite, a rare, zinc iron arsenate hydroxide hydrate, originates from the type locality: the Ojuela mine, Mapimi, Durango, Mexico. Divergent tufts of creamy white, sub-millimeter, acicular crystals of ojuelaite are concentrated in a few tiny vugs on the specimen; one vug in particular (marked by an arrow) is exceptionally good. Clusters of green-brown, micro beudantite crystals are found locally on the piece and one worth noting is highlighted with an arrow. Ex. Paulo Matioli collection. Also accompanied by Dakota Matrix Minerals (Tom Loomis) label. These are so rare in valid specimens that they are almost nonexistent on the market.
Wheal Carpenter, Fraddam, Gwinear-Gwithian, Cornwall, England, UK
Miniature, 3.5 x 3.0 x 1.5 cm
A rich, classic, specimen of botryoidal, green cornwallite in a boxwork, matrix with quartz, granular massive barite, and goethite from Wheal Carpenter, Fraddam, Gwinear-Gwithian, Cornwall, England, UK. Cornwallite is the arsenate analogue of malachite. British Museum of Natural History label indicating it was collected by Arthur Kingsbury in 1952 and verified via XRD by Mike Rumsey in 2007. A nice specimen with good provenance. Ex. British Museum and Paulo Matioli collections.
Caland pit, Atikokan, Hutchinson Township, Ontario, Canada
Miniature, 3.5 x 3 x 2 cm
A MAJOR locality Manganite that has unusually blocky crystals for the locale up to 1.7 cm, with razor-sharp edges and excellent luster. The striations, slight overlap, and the way that these sit on the Goethite matrix make this exceptionally aesthetic as a whole, for a black mineral. Certainly one of the best Manganites I have seen from this well-known location, it has been in Marty's private collection for over a decade since a big find here in the 1990s
A botryoidal crust of brownish-black goethite is host to a large, aesthetic cluster of lustrous and translucent, bi-colored manganoan adamite crystals, to a very LARGE SIZE of 3.5 cm in length. The lower 80% of the crystals are ivory-colored while the gemmier terminations exhibit a lovely, light lavender color. This is one of the largest clusters of manganoan adamite I have seen from the incredible finds at Mina Ojuela in 1981-2. Although the color is not intense, it is present, and in this case it is present as an accent to the overall form and richness of the piece, lending purple highlights to unusual white crystals. The crystals are sinuous and interesting, in and of their own. The contrast of the curving crystals which are sharply pointed on either end, with the rolling black hills of goethite matrix, really adds a lot to the specimen
Ex Dalton and Consie Prince collection. Sold by their daughter in a private auction to collector Dave Stoudt bidding against major private collector buyers and a dealership in 2005. Joe Budd Photos.
Thumbnail – Maximum 3.0 cm
Toenail – A “gut feeling” but often overlaps between a large thumbnail and a small miniature
Miniature – Maximum 5.0 cm
Small Cabinet – Maximum 9.4 cm
Cabinet – Maximum 18.0 cm
Large Cabinet – Over 18.0 cm
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