Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Arsenopyrite from
Emmons Quarry, Uncle Tom Mountain, Greenwood, Oxford County, Maine, USA


Locality type:Quarry
Classification
Species:Arsenopyrite
Formula:FeAsS
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Arsenopyrite data
Locality Data:Click here to view Emmons Quarry, Uncle Tom Mountain, Greenwood, Oxford County, Maine, USA
Data Identifiers
Mindat Occurrence Record ID:28526
Long-form Identifier:1:3:28526:7
GUID (UUID V4):0
Nearest other occurrences of Arsenopyrite
5.6km (3.5 miles) ⓘNoyes Mountain Quarry (Harvard Quarry), Greenwood, Oxford County, Maine, USA
5.6km (3.5 miles) ⓘMorgan Quarry (Morgan Pit; Upper Noyes Mountain Quarry; Upper Harvard Quarry), Greenwood, Oxford County, Maine, USA
6.3km (3.9 miles) ⓘWaisanen Quarry (Tamminen-Waisanen Quarry), Greenwood, Oxford County, Maine, USA
16.3km (10.1 miles) ⓘWhispering Pines Quarry, Paris, Oxford County, Maine, USA
17.8km (11.1 miles) ⓘMount Tom Spar Quarry, Sumner, Oxford County, Maine, USA
18.4km (11.4 miles) ⓘRyerson Hill Quarries, Paris, Oxford County, Maine, USA
18.6km (11.6 miles) ⓘMount Mica Quarry, Paris, Oxford County, Maine, USA
20.0km (12.5 miles) ⓘBessey Quarry, Buckfield, Oxford County, Maine, USA
21.6km (13.4 miles) ⓘBennett Quarry, Buckfield, Oxford County, Maine, USA
22.1km (13.7 miles) ⓘCole Quarry, Stoneham, Oxford County, Maine, USA
References
Thompson, Woodrow B., Joyner, Ronald L., Woodman, Raymond G., King, Vandall T. (1998) Bulletin (41), A Collector's Guide to Maine Mineral Localities (3rd ed.) Maine Geological Survey
Falster, Alexander U., Simmons, William B., Webber, Karen L., Dallaire, Donald A., Nizamoff, James W., Sprague, Raymond A. (2019) The Emmons Pegmatite, Greenwood, Oxford County, Maine. Rocks & Minerals, 94 (6) 498-519 doi:10.1080/00357529.2019.1641021
Falster, Alexander U.; Simmons, William B.; Webber, Karen L.; Roda-Robles, Encarnacion (2025) Formation Conditions of Elbaite/Fluor-Elbaite in an Unorthodox Location in the Emmons Pegmatite, Greenwood, Oxford Co., Maine. The Canadian Journal of Mineralogy and Petrology, 63 (6). 727-746 doi:10.3749/2500015
 
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