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
Barrus farm pegmatite localities, Goshen, Hampshire County, Massachusetts, USA


Locality type:Pegmatite
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 Barrus farm pegmatite localities, Goshen, Hampshire County, Massachusetts, USA
Data Identifiers
Mindat Occurrence Record ID:29808
Long-form Identifier:1:3:29808:5
GUID (UUID V4):0
Nearest other occurrences of Montmorillonite
22.6km (14.0 miles) ⓘLoudville Lead Mines (Manhan Lead-Silver Mine; Southampton Lead Mine; Northampton Lead Mine), Easthampton, Hampshire County, Massachusetts, USA
32.0km (19.9 miles) ⓘBlandford mica mines, Blandford, Hampden County, Massachusetts, USA
82.5km (51.3 miles) ⓘBig Mine, Alstead, Cheshire County, New Hampshire, USA
84.8km (52.7 miles) ⓘTurner Mine, Marlow, Cheshire County, New Hampshire, USA
87.9km (54.6 miles) ⓘThomaston Dam railroad cut, Thomaston Dam, Thomaston, Litchfield County, Connecticut, USA
95.2km (59.1 miles) ⓘAndrews Quarry (old Hale Quarry; Grandfather Andrews Quarry), Portland, Middlesex County, Connecticut, USA
95.4km (59.3 miles) ⓘHale Quarry (Andrews Quarry; Glastonbury Quarry), Portland, Middlesex County, Connecticut, USA
96.6km (60.0 miles) ⓘWalden Gem Quarry, Portland, Middlesex County, Connecticut, USA
99.5km (61.9 miles) ⓘStrickland Quarry, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA
References
"Western Massachusetts Mineral Localites" by Plante, A.R., Valley Geology Press, 1992
 
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