Dims: 3.9" x 2.3" x 1.9" (9.9 x 5.8 x 4.8 cm)
Wt: 8.69 oz. (246.6 g)
1200 foot level, Cole Shaft, Bisbee, Cochise County, Arizona, U.S.A.
This specimen consists of a variety of Cuprite called Chalcotrichite on a rusty brown host rock. It has a finely fibrous habit, and is arranged randomly in a "thatch" on one side of the host rock. The fibers have a deep red coloration, are apparently transparent or translucent, and have a seemingly bright luster that is likely adamantine. Some of the fibers appear to be as long as 0.5" (1.3 cm), but all are thinner than human hair. There are several smaller, tighter thatches of Chalcotrichite present in small hollows in other areas on the host rock, but the largest is by far the most visible. There do not appear to be any other copper minerals present on the host rock, which I think is made up of both massive Cuprite and some limonite and/or goethite. It is a rather unusual-looking specimen that I enjoyed examining under magnification, where one can actually see the concentration of the fine fibers.