Goodchild, of the Scottish Geological Survey, found wulfenite there in 1875 but the locality only really became of interest to collectors in the 1950s following the reporting of a suite of rare supergene minerals including bayldonite, duftite, beudantite
, carminite, lindgrenite and stolzite (the first authenticated British occurrence).
forms minute brown-green rhombohedral crystals which clearly contain copper.
The crystals line cavities to a few centimeters across in earthy brown limonite, associated with microcrystals of anglesite, arsenian siderite and beudantite
One proved to be beudantite
, but the other could not be identified with any known species.
Vein Minerals Adamite Goethite Arsenopyrite Gold Austinite Hemimorphite Barite Malachite Beudantite
Mimetite Calcite Smithsonite Cerussite Sphalerite Chalcopyrite Plumbojarosite Chlorargyrite Pyrite Chrysocolla Rosasite Conichalcite Tetrahedrite Fluorite Willemite Galena Wulfenite
Other minerals not directly associated with calderonite are: wulfenite, mimetite, cerussite, beudantite
, adamite, hemimorphite, smithsonite, chalcophanite, silver, quartz and Ca-Fe carbonates.
4 Rossie Mines (NY), Ge-rich Beudantite
(Namibia), Willard Mine (NV), Mineral Mortality [square] v.
Occurrence: Associated minerals are: beudantite
, cuprian adamite, conichalcite, wulfenite, quartz and chalcocite.
Even so, extremely rare species such as germanium-rich beudantite
, schneiderhohnite, stottite and scorodite, can be seen in the collection as well-crystallized, aesthetic specimens.
Other minerals in the dump material are: cobaltaustinite, scorodite, bariumpharmacosiderite, olivenite, conichalcite, erythrite, arsenjosiderite, mimetite, beudantite
, silver, bismuth, acanthite, galena, pyrite and skutterudite.
Several specimens of a germanium-rich beudantite
crystals to 1.
In the siliceous limonite bodies of the Adolf section, beudantite
is found finely dispersed as submicroscopic grains enclosed in cerussite.