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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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Montmorillonite from
Greenlaw Quarry, East Mount Apatite Mining District, Auburn, Androscoggin County, Maine, USA


06315750017371065373298.jpg
Montmorillonite

Greenlaw Quarry, East Mount Apatite Mining District, Auburn, Androscoggin County, Maine, USA
06315750017371065373298.jpg
Montmorillonite

Greenlaw Quarry, East Mount Apatite Mining District, Auburn, Androscoggin County, Maine, USA
02397070017271982249709.jpg
Montmorillonite

Greenlaw Quarry, East Mount Apatite Mining District, Auburn, Androscoggin County, Maine, USA
Locality type:Quarry
Classification
Species:Montmorillonite
Formula:(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Montmorillonite data
Locality Data:Click here to view Greenlaw Quarry, East Mount Apatite Mining District, Auburn, Androscoggin County, Maine, USA
Data Identifiers
Mindat Occurrence Record ID:33231
Long-form Identifier:1:3:33231:6
GUID (UUID V4):0
Nearest other occurrences of Montmorillonite
0.2km (0.1 miles) ⓘMaine Feldspar Quarry, East Mount Apatite Mining District, Auburn, Androscoggin County, Maine, USA
0.9km (0.6 miles) ⓘKeith Quarry (Towne Quarry), West Mount Apatite Mining District, Auburn, Androscoggin County, Maine, USA
1.0km (0.6 miles) ⓘPulsifer Quarry & Dionne extension, West Mount Apatite Mining District, Auburn, Androscoggin County, Maine, USA
1.2km (0.7 miles) ⓘGroves Quarry (Hole in the Ground Quarry), West Mount Apatite Mining District, Auburn, Androscoggin County, Maine, USA
2.0km (1.3 miles) ⓘBerry-Havey Quarry, Poland, Androscoggin County, Maine, USA
18.2km (11.3 miles) ⓘMount Marie Quarries, Paris, Oxford County, Maine, USA
24.8km (15.4 miles) ⓘMount Mica Quarry, Paris, Oxford County, Maine, USA
25.2km (15.6 miles) ⓘBennett Quarry, Buckfield, Oxford County, Maine, USA
27.0km (16.8 miles) ⓘRyerson Hill Quarries, Paris, Oxford County, Maine, USA
33.4km (20.7 miles) ⓘB.B. No. 7 Quarry, Norway, Oxford County, Maine, USA
References
 
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