Besides the wonderful Ojuela fluorites the case held Ojuela rosasite
specimens with smooth, baby-blue rosasite
spheres to 4 cm diameter, some with thin, water-clear calcite crystals.
The world's best specimens of paradamite and kottigite/parasymplesite have also been found there, as well as superb specimens of aurichalcite, scorodite, hemimorphite, rosasite
, wulfenite and other minerals.
The radial habit of growth in three dimensions (e.g., the spherical habit of adamite, rosasite
, natrolite, etc.) or in two dimensions (e.g., pyrite "dollars" in shale) entails the nucleation of many crystals at a point source, and growth away from that source in the direction in which each crystal can remain in contact with the solution that nourishes its growth.
Some specimens show tiny, pale green, rice-grain crystals of smithsonite, hemimorphite microcrystals, and deep green spots of rosasite
. Dave Bunk was offering a shelf-full of this material in his room at the Holiday Inn.
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 ACKNOWLEDGMENTS
Allan Young's case of 35 impeccably tasteful thumbnails from Idaho localities, many of them self-collected, was noteworthy, as was Tom Hughes' case which was entirely filled with self-collected things, including a wide, beautiful, baby-blue Silver Bill mine, Arizona rosasite
and a terrific thumbnail of willemite ("troostite") from the Sterling Hill mine, New Jersey.
The first is an oxidized zone in brecciated dolomite where well-developed, transparent, tan to gray cyclic twins up to 2 cm across occur with rosasite
on broken rock fragments.
In the western mines (Musonoi, Kamoto), a double carbonate of copper and cobalt (kolwezite) has been found which belongs to the rosasite
structural group and contain nearly 20% cobalt (Deliens and Piret, 1980).
The finest known examples of a number of supergene copper minerals were found at Bisbee: antlerite, bisbeeite, brochantite, chalcoalumite, claringbullite, conichalcite, crednerite, cuprite, delafossite, graemite, nantokite, paramelaconite, paratacamite, rosasite
The best specimens of aurichalcite we have seen have come from the Hozarco mine, near the village of Pineres, where it is present in the form of attractive groups of needles on iron-stained quartz along with rosasite
, hemimorphite, hydrozincite and malachite.