Malachite, a copper carbonate hydroxide mineral, was noted in early lists by Vanuxem (1822) and others, but it has been unstudied since, and no physical, optical, or chemical data exist. It is known in minor amounts from both deposits, occurring as green druses of mm-sized small crystals and as individual crystals, crusts, and small masses and aggregates.
At Franklin, malachite was found intimately and consistently with the azurite occurrences noted herein and generally with the same associated minerals. Specimens labeled "Parker Shaft" also exist, but few records of occurrences were kept. The Sterling Hill occurrences are the same as those for azurite for the most part; Jenkins and Misiur (1994) reported an occurrence with oxidized sulfides. (Dunn, 1995)

 Location Found: Franklin and Ogdensburg
 Formula: Cu2(CO3)(OH)2
 Essential Elements: Carbon, Copper, Hydrogen, Oxygen
 All Elements in Formula: Carbon, Copper, Hydrogen, Oxygen
 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   Malachite

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.622

Frondel, Clifford (1972). The minerals of Franklin and Sterling Hill, a checklist. NY.: John Willey & Sons. p.66

The Picking Table References
 PT Issue and PageDescription / Comment
View IssueV. 35, No. 2 - Fall 1994, pg. 21A Complex Base-Metal Assemblage From the Sterling Mine New Jersey - Malachite
View IssueV. 27 No. 2 - Fall 1986, pg. 6Minerals of the Franklin Quarry, Philip P. Betancourt, Malachite
View IssueV. 7, No. 2 - August 1966, pg. 11The Minerals of Sterling Hill 1962-65 by Frank Z. Edwards - Malachite

Malachite, calcite, feldspar, franklinite and biotite mica from Sterling Hill Mine, NJ.
Malachite (light greenish blue), calcite, feldspar (light green), franklinite (black) and biotite mica (glossy black) from Sterling Hill Mine, NJ. Photo By WP.

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