Dims: 3.6" x 1.8" x 1.5" (9.1 x 4.6 x 3.8 cm)
Wt: 5.27 oz. (149.5 g)
79 Mine, Hayden, Gila County, Arizona, U.S.A.
This lovely hand specimen consists of a chunk of a pale beige host rock that is interspersed with several hollows; these hollows are lined with many small clusters of fibrous, radiating Aurichalcite needles. These needles are very small, not exceeding 0.1" (3 mm) in length, and are at least as thin as a human hair. Needless to say, one cannot study their orthorhombic form without a powerful microscope. They have a pale aqua-blue color and show a satiny luster in their clustering. All are most likely translucent or transparent, and many of these clusters are coated with a druse of colorless, transparent calcite crystals (see the close-up image). There are a few deep hollows that extend into the host rock, which also contain these clusters.