Euchroite, a copper arsenate hydroxide hydrate mineral, was found on a Sterling Hill specimen by Ewald Gerstmann; these bright green 1 mm microcrystals were verified using X-ray methods. It occurred associated with altered sarkinite and brandtite on willemite/franklinite ore. It is not known from Franklin and is very rare. (Dunn, 1995)

 Location Found: Ogdensburg
 Year Discovered: 1823
 Formula: Cu2(AsO4)(OH) · 3H2O
 Essential Elements: Arsenic, Copper, Hydrogen, Oxygen
 All Elements in Formula: Arsenic, 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   Euchroite

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

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