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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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Rockbridgeite from
Emmons Quarry, Uncle Tom Mountain, Greenwood, Oxford County, Maine, USA


07223100017366564275465.jpg
Rockbridgeite

Emmons Quarry, Uncle Tom Mountain, Greenwood, Oxford County, Maine, USA
04155670017720431675102.jpg
Rockbridgeite

Emmons Quarry, Uncle Tom Mountain, Greenwood, Oxford County, Maine, USA
07411490017272021637588.jpg
Rockbridgeite

Emmons Quarry, Uncle Tom Mountain, Greenwood, Oxford County, Maine, USA
Locality type:Quarry
Classification
Species:Rockbridgeite
Formula:(Fe2+0.5Fe3+0.5)2Fe33+(PO4)3(OH)5
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Rockbridgeite data
Locality Data:Click here to view Emmons Quarry, Uncle Tom Mountain, Greenwood, Oxford County, Maine, USA
Data Identifiers
Mindat Occurrence Record ID:28574
Long-form Identifier:1:3:28574:4
GUID (UUID V4):0
Nearest other occurrences of Rockbridgeite
18.4km (11.4 miles) ⓘRyerson Hill Quarries, Paris, Oxford County, Maine, USA
24.5km (15.2 miles) ⓘDunton Gem Quarry, Newry, Oxford County, Maine, USA
24.7km (15.3 miles) ⓘCrooker Gem Pegmatite Quarries, Newry, Oxford County, Maine, USA
24.7km (15.3 miles) ⓘBell pit, Newry, Oxford County, Maine, USA
24.7km (15.4 miles) ⓘNevel Quarry, Newry, Oxford County, Maine, USA
25.6km (15.9 miles) ⓘRed Hill quarries, Rumford, Oxford County, Maine, USA
29.4km (18.3 miles) ⓘBlack Mountain Quarry, Rumford, Oxford County, Maine, USA
42.2km (26.2 miles) ⓘBerry-Havey Quarry, Poland, Androscoggin County, Maine, USA
52.3km (32.5 miles) ⓘEstes Quarry, West Baldwin, Baldwin, Cumberland County, Maine, USA
References
Mineral News (1995) 11:2 pp1,2,5
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
 
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