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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Montmorillonite from
Lord Hill Quarry (Lord Hill Mine), Stoneham, Oxford 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 Lord Hill Quarry (Lord Hill Mine), Stoneham, Oxford County, Maine, USA
Data Identifiers
Mindat Occurrence Record ID:28488
Long-form Identifier:1:3:28488:8
GUID (UUID V4):0
Nearest other occurrences of Montmorillonite
2.7km (1.7 miles) ⓘCole Quarry, Stoneham, Oxford County, Maine, USA
23.4km (14.5 miles) ⓘEmmons Quarry, Uncle Tom Mountain, Greenwood, Oxford County, Maine, USA
25.7km (16.0 miles) ⓘTamminen Quarry, Greenwood, Oxford County, Maine, USA
25.8km (16.0 miles) ⓘNoyes Mountain Quarry (Harvard Quarry), Greenwood, Oxford County, Maine, USA
25.9km (16.1 miles) ⓘWaisanen Quarry (Tamminen-Waisanen Quarry), Greenwood, Oxford County, Maine, USA
25.9km (16.1 miles) ⓘMorgan Quarry (Morgan Pit; Upper Noyes Mountain Quarry; Upper Harvard Quarry), Greenwood, Oxford County, Maine, USA
26.8km (16.6 miles) ⓘB.B. No. 7 Quarry, Norway, Oxford County, Maine, USA
38.6km (24.0 miles) ⓘMount Mica Quarry, Paris, Oxford County, Maine, USA
39.5km (24.6 miles) ⓘRyerson Hill Quarries, Paris, Oxford County, Maine, USA
39.9km (24.8 miles) ⓘDunton Gem Quarry, Newry, Oxford County, Maine, USA
References
Bastin, E. S. (1911) Geology of the pegmatites and associated rocks of Maine, including feldspar, quartz, mica, and gem deposits. Bulletin 445. US Geological Survey doi:10.3133/b445
 
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