Dims: 2.9" x 2.7" x 1.3" (7.3 x 6.9 x 3.3 cm)
Wt: 3.07 oz. (87.2 g)
Omega Mine, Helvetia District, Pima County, Arizona, U.S.A.
Scores of tiny Rosasite sphericles rest on the classic limonite host rock of this specimen. The majority of these spheres rest on one side of the flat piece and are coated with a colorless and transparent layer of what is likely calcite, which forms a crust. The Rosasite spheres do not measure more than 2 mm in diameter and have a color that ranges from pale to deep aqua-blue. There are more of these spheres on the other side of the host rock, which shows some very interesting hollows in which the Rosasites rest. Most are intact and not covered by calcite, but a few are damaged and incomplete. High magnification is needed to see the fibrous, radiating habit of the Rosasite needles in these damaged spheres. There is a small amount of goethite present in the limonite matrix, along with what appear to be very fine intersecting veins of calcite, which likely induced the formation of the hollows.