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Erythrite from
Great Hill cobalt mines, Cobalt, East Hampton (Chatham), Middlesex Co., Connecticut, USA

Locality type:Mine
Classification
Species:Erythrite
Formula:Co3(AsO4)2 · 8H2O
Comments:Formed from the weathering of Co-rich loellingite. "Eugene Franckfort reported that the face of one lode, opened more than a century ago, was covered with, abundant erythrite crystals… as fine as any which he had seen in his native Europe." (Schooner 1958). "The Francfort mineral collection [at Wesleyan University] contains some excellent samples of erythrite from Bucks Shaft" (Gray 2005). It was common during the mining, but very scarce now.
A small flake was tested in concentrated HCl and it turned the solution blue, indicating erythrite.
Habit:earthy incrustation or delicate needles
Colour:red
Confirmation
Validity:Believed Valid
References
References:Schooner (1958); Gray (2005)
Associated Minerals Based on Photo Data:
Löllingite2 photos of Erythrite associated with Löllingite at this locality.
Scorodite1 photo of Erythrite associated with Scorodite at this locality.
Data
Mineral Data:Click here to view Erythrite data
Locality Data:Click here to view Great Hill cobalt mines, Cobalt, East Hampton (Chatham), Middlesex Co., Connecticut, USA
Photo GalleryView Gallery (2 photos)
Nearest other occurrences of Erythrite
51.1km (31.7 miles) State Route 8 and State Route 118 interchange, Harwinton, Litchfield Co., Connecticut, USA
65.1km (40.5 miles) Old Mine Plaza construction site, Long Hill, Trumbull, Fairfield County, Connecticut, USA
92.8km (57.7 miles) Tilly Foster Iron Mine, Brewster, Town of Southeast, Putnam Co., New York, USA
 
Mineral and/or Locality  
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