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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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Uraninite from
Estes Quarry, West Baldwin, Baldwin, Cumberland County, Maine, USA


08333940017368574334214.jpg
Uraninite

Estes Quarry, West Baldwin, Baldwin, Cumberland County, Maine, USA
08333940017368574334214.jpg
Uraninite

Estes Quarry, West Baldwin, Baldwin, Cumberland County, Maine, USA
01907250017368574344086.jpg
Uraninite

Estes Quarry, West Baldwin, Baldwin, Cumberland County, Maine, USA
Locality type:Quarry
Classification
Species:Uraninite
Formula:UO2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Uraninite data
Locality Data:Click here to view Estes Quarry, West Baldwin, Baldwin, Cumberland County, Maine, USA
Data Identifiers
Mindat Occurrence Record ID:32903
Long-form Identifier:1:3:32903:9
GUID (UUID V4):0
Nearest other occurrences of Uraninite
27.5km (17.1 miles) ⓘHam and Weeks Mine, Wakefield, Carroll County, New Hampshire, USA
37.0km (23.0 miles) ⓘMiddle Moat Mountain locality, Hale's Location, Carroll County, New Hampshire, USA
42.6km (26.5 miles) ⓘFoster Hill prospects, Stoneham, Oxford County, Maine, USA
42.8km (26.6 miles) ⓘLord Hill Quarry (Lord Hill Mine), Stoneham, Oxford County, Maine, USA
45.3km (28.2 miles) ⓘCole Quarry, Stoneham, Oxford County, Maine, USA
45.3km (28.2 miles) ⓘWardwell Quarry (Pechnic Quarry), Albany, Oxford County, Maine, USA
45.8km (28.4 miles) ⓘBerry-Havey Quarry, Poland, Androscoggin County, Maine, USA
46.3km (28.8 miles) ⓘWentworth Quarry, Albany, Oxford County, Maine, USA
46.4km (28.9 miles) ⓘGroves Quarry (Hole in the Ground Quarry), West Mount Apatite Mining District, Auburn, Androscoggin County, Maine, USA
46.5km (28.9 miles) ⓘPulsifer Quarry & Dionne extension, West Mount Apatite Mining District, Auburn, Androscoggin County, Maine, USA
References
Thompson, Woodrow B., Bearss, Gene T., Falster, Alexander U., Simmons, William B., Nizamoff, Jams W. (2000) The Estes Quarry, Cumberland County, Maine: A New Pegmatite Mineral Locality. Rocks & Minerals, 75 (6) 408-418 doi:10.1080/00357520009605667
 
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