Rosasite, a copper zinc carbonate hydroxide mineral, was reported from Franklin by Cook (1973) as tiny blue-green spherules on hemimorphite which, with goethite, line cavities in iron-oxide-stained calcite. It was found on the 200 level in the 740 pillar at Franklin; this is near the site of the azurite crystals studied by Palache (1928a, 1935). Several specimens at Harvard University were verified subsequently by [Dunn] employing X-ray and microprobe analytical procedures. Material intimately associated with hemimorphite has a Cu:Zn ratio of 65:35, and material free from such hemimorphite has a Cu:Zn ratio of 8:2. Rosasite was confirmed from Sterling Hill by Jenkins and Misiur (1994); they found it associated with malachite and aurichalcite from below the 700 level. (Dunn, 1995)

 Location Found: Franklin and Ogdensburg
 Year Discovered: 1908
 Formula: (Cu,Zn)2(CO3)(OH)2
 Essential Elements: Carbon, Copper, Hydrogen, Oxygen
 All Elements in Formula: Carbon, Copper, Hydrogen, Oxygen, Zinc
 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   Rosasite

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.624

Frondel, Clifford (1972). The minerals of Franklin and Sterling Hill, a checklist. NY.: John Willey & Sons. p.74

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 - Rosasite
View IssueV. 13, No. 1 - February 1972, pg. 9Franklin Mineral Notes - Rosasite
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