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
Blandford mica mines, Blandford, Hampden County, Massachusetts, USA


Locality type:Mine
Classification
Species:Montmorillonite
Formula:(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Confirmation
Validity:Unconfirmed/Questioned
Data
Mineral Data:Click here to view Montmorillonite data
Locality Data:Click here to view Blandford mica mines, Blandford, Hampden County, Massachusetts, USA
Data Identifiers
Mindat Occurrence Record ID:29875
Long-form Identifier:1:3:29875:7
GUID (UUID V4):0
Nearest other occurrences of Montmorillonite
18.5km (11.5 miles) ⓘLoudville Lead Mines (Manhan Lead-Silver Mine; Southampton Lead Mine; Northampton Lead Mine), Easthampton, Hampshire County, Massachusetts, USA
32.0km (19.9 miles) ⓘBarrus farm pegmatite localities, Goshen, Hampshire County, Massachusetts, USA
55.9km (34.7 miles) ⓘThomaston Dam railroad cut, Thomaston Dam, Thomaston, Litchfield County, Connecticut, USA
67.2km (41.8 miles) ⓘAndrews Quarry (old Hale Quarry; Grandfather Andrews Quarry), Portland, Middlesex County, Connecticut, USA
67.5km (41.9 miles) ⓘHale Quarry (Andrews Quarry; Glastonbury Quarry), Portland, Middlesex County, Connecticut, USA
68.6km (42.6 miles) ⓘWalden Gem Quarry, Portland, Middlesex County, Connecticut, USA
70.8km (44.0 miles) ⓘKent Iron Mine (Limonite mine), Kent, Litchfield County, Connecticut, USA
71.5km (44.4 miles) ⓘStrickland Quarry, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA
84.3km (52.4 miles) ⓘGillette Quarry (J-J Mine; Haddam Neck Quarry), Haddam Neck, Haddam, Middlesex County, Connecticut, USA
References
"Western Massachusetts Mineral Localities" by Plante, A.R., Valley Geology Press, 1992
 
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