During the 2015 Tucson gem shows, gem dealer Mark Kaufman (Kaufman Enterprises, San Diego, California, USA) had some rough and cut transparent rhodochrosite
from another locality: Brazil.
Visitors to the exhibition were greeted, just inside the entrance, by four aesthetic cabinet specimens in individual glass cases: a rhodochrosite
from the Sweet Home mine, Colorado; a green fluorite from Riemvasmaak, South Africa; a native gold from the Eagle's Nest mine, California; and an amethyst crystal group from the Anahi mine, Bolivia.
He conducted specimen mining operations at a number of localities throughout the west, including Colorado for rhodochrosite
, Idaho for barite, and his home state of Nevada for a variety of minerals.
First, Ramos and Burillo had splendid specimens of rhodochrosite
taken a year or so ago from the Manuelita mine, Yauli Province, Lima Department.
Manganese occurs primarily as rhodochrosite
(MnCO3) and pyrolusite (MnO2) and can be readily upgraded to electrolytic manganese dioxide (EMD) which currently sells for US$2,000 per tonne in the North American market.
In the text Wiedenbeck lingers on some of these excitements, and offers personal angles on them: for one, there's a good account of the Sweet Home Rhodochrosite
fever that came to town in 1993, and later, echoing it, comes the story of Wiedenbeck's at last buying, from Bryan Lees in 2002, the (barely affordable) Sweet Home rhodochrosite
specimen of his dreams.
The Wyndham pit yielded manganese oxide minerals, including well-crystallized specimens of twinned black hausmannite crystals and also some attractive specimens of pink rhodochrosite
(collected by Sir Arthur Russell in the 1930s).
These veins locally contain significant concentrations of rhodochrosite
and are associated with minor concentrations of pyrite, sphalerite, and galena mineralization both within the veins and in the adjacent host rocks.
He contributed two articles to the Mineralogical Record: one on rhodochrosite
in 1971 and the other (with Richard Kosnar) on the minerals of the Colorado mineral belt in 1976.
Present feed for the four-man mining operation at the site is coming from a recently discovered chalcedonic quartz and rhodochrosite
vein exposed in a shallow pit.
But I still would have preferred to see a larger proportion of higher quality specimens: these books are, after all, addressed to the collector, and if we collectors are to be reminded that there is more to the world of beautiful minerals than gold, proustite, azurite, rhodochrosite
and tourmaline, we need to see some specimens of rock-forming minerals performing at their peaks.
with Fluorite Strawberry Pocket, Sweet Home Mine, Alam, Colorado ex-collection Gene Meieran