Brochantite, a copper sulfate hydroxide mineral, was reported from Sterling Hill by Cook (1973), who described it occurring as dark green crystals associated with linarite, devilline, and gypsum as secondary minerals on chalcocite and galena, which in turn encrust calcite containing magnetite, apatite, and garnet.
It is distinguished from malachite by the lack of effervescence in HCl. Brochantite has been noted by [Dunn] from a number of minor Sterling Hill secondary assemblages, forming in most cases from the alteration of chalcocite (see also Jenkins and Misiur, 1994). It has not been reported from Franklin. (Dunn, 1995)

 Location Found: Franklin and Ogdensburg
 Year Discovered: 1824
 Formula: Cu4(SO4)(OH)6
 Essential Elements: Copper, Hydrogen, Oxygen, Sulfur
 All Elements in Formula: Copper, Hydrogen, Oxygen, Sulfur
 IMA Status: Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
 To find out more about this mineral at minDat's website, follow this link   Brochantite

Dunn, Pete J. (1995). Franklin and Sterling Hill New Jersey: the world's most magnificent mineral deposits. Franklin, NJ.: The Franklin-Ogdensburg Mineralogical Society. p.630

Frondel, Clifford (1972). The minerals of Franklin and Sterling Hill, a checklist. NY.: John Willey & Sons. p.46

The Picking Table References
 PT Issue and PageDescription / Comment
View IssueV. 35, No. 2 - Fall 1994, pg. 19A Complex Base-Metal Assemblage From the Sterling Mine New Jersey - Brochantite
View IssueV. 34, No. 2 - Fall 1993, pg. 14Recent Mineral Finds From The Sterling Mine Ogdensburg, New Jersey - Gypsum, Brochantite
View IssueV. 13, No. 1 - February 1972, pg. 7Franklin Mineral Notes - Brochantite/Devilite/Linarite (small article)

Brochantite on chalcocite matrix from Franklin, NJ
Brochantite (Green) on chalcocite matrix from Franklin, NJ. Field of view 1/3" x 1/3" (8 mm x 8 mm). Photo by WP.

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