A very rare example of crystallized brochantite in large, robust, thick crystals exceeding 1 cm. Such specimens are old Bisbee classics from the mid and early 1900s, and seldom seen today. There are several styles, of which this is the best for my taste because the crystals are more individual and some other styles have them in solid masses, almost massive in fact. An important, historic Bisbee specimen, and quite good for this species. From the well-known Tucson collection of 40-year collector, Harold Urish.