Erythrite, a cobalt arsenate hydrate mineral, was reported from Franklin by French (1953). Hendricks (1960) reported it as light violet red clusters of fibrous crystals, associated with galena, calcite, and malachite on a specimen from Mine Hill. It was reported to be Ni-free and Fe-free and to contain major Co and As. Erythrite has been found sporadically in minor amounts at Sterling Hill, where it occurs as bright pink to light pink clusters (0.5-1.0 mm) of microscopic crystals on fracture surfaces in franklinite/willemite ore. It has also been found as pink 1-2 mm rosettes with epidote on the 1400 level. (Dunn, 1995)

 Location Found: Franklin and Ogdensburg
 Formula: Co3(AsO4)2 · 8H2O
 Essential Elements: Arsenic, Cobalt, Hydrogen, Oxygen
 All Elements in Formula: Arsenic, Cobalt, 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   Erythrite

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.667

Frondel, Clifford (1972). The minerals of Franklin and Sterling Hill, a checklist. NY.: John Willey & Sons. p.55

The Picking Table References
 PT Issue and PageDescription / Comment
View IssueV. 34, No. 2 - Fall 1993, pg. 14Recent Mineral Finds From The Sterling Mine Ogdensburg, New Jersey - Erythrite
View IssueV. 19, No. 2 - September 1978, pg. 7Recent Mineral Occurrences at Sterling Hill by Stephen Sanford - Erythrite (small article)
View IssueV. 15, No. 1 - February 1974, pg. 9Mineral Notes - Erythrite

Erythrite, calcite and franklinite from Franklin, NJ
Erythrite (violet-red), calcite (white to tan) and franklinite (black) from Franklin, NJ. Field of view 1" (2.6 cm). From the collection of, and photo by Robert A. Boymistruk.

Erythrite, calcite, hendricksite Sterling Hill Mine, Ogdensburg, NJ
Erythrite (pink to violet), calcite (white), and hendricksite (black) from the Sterling Hill Mine, Ogdensburg, NJ. Field of view 1 1/16" (27 mm). From the collection of George Elling, photo by Robert A. Boymistruk.

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