Brochantite is a sulfate mineral, one of a number of cupric sulfates. Its chemical formula is Cu<sub>4</sub>SO<sub>4</sub>(OH)<sub>6</sub>. In sheltered areas, the main corrosion product is antlerite.
Brochantite veins were mined for copper in Chuquicamata, Chile, from 1879 until 1912 when a more indiscriminate large-scale mining of low-grade ores began at the mine.
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File:Brochantite-md75b.jpg|These long slender crystals, from Bisbee, Arizona, have the highly desirable emerald green color and good luster that is sought after in brochantite by collectors. Detail of thumbnail specimen, size 2.3 × 2 × .8 cm.
File:Brochantite-Chrysocolla-k329b.jpg| Brochantite on chrysocolla. Locality: Rokana Mine, Kitwe, Copperbelt Province, Zambia. Detail of larger specimen, field of view about 3 × 5 cm.
File:Brochantite-Linarite-20434.jpg|Brochantite on linarite. Locality: Mujuram, Morocco. Size 8 × 8 cm.
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