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Montmorillonite from
Strickland Quarry (Eureka Quarry), Strickland pegmatite (Strickland-Cramer Quarry; Strickland-Cramer Mine; Strickland-Cramer Feldspar-Mica Quarries), Collins Hill, Portland, Middlesex Co., Connecticut, USA

Locality type:Quarry
Classification
Species:Montmorillonite
Formula:(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Comments:As crumbly, soft, pink masses where spodumene has decomposed.
Habit:earthy
Colour:pink
Abundance at site:Rare
Confirmation
Validity:Confirmed
Confirmation Methods:Visually Identified
References
References:Schooner, Richard. (1955): 90 Minerals from 1 Connecticut Hill. Rocks & Minerals: 30(7-8): 351-8.; Cameron, Eugene N., Larrabee, David M., McNair, Andrew H., Page, James T., Stewart, Glenn W., and Shainin, Vincent E. (1954): Pegmatite Investigations 1942-45 New England; USGS Professional Paper 255: 333-338.
Data
Mineral Data:Click here to view Montmorillonite data
Locality Data:Click here to view Strickland Quarry (Eureka Quarry), Strickland pegmatite (Strickland-Cramer Quarry; Strickland-Cramer Mine; Strickland-Cramer Feldspar-Mica Quarries), Collins Hill, Portland, Middlesex Co., Connecticut, USA
Nearest other occurrences of Montmorillonite
3.0km (1.9 miles) Walden Gem Quarry, Portland, Middlesex Co., Connecticut, USA
4.1km (2.6 miles) Hale Quarry (Andrews Quarry; Glastonbury Quarry), Portland, Middlesex Co., Connecticut, USA
4.4km (2.7 miles) Andrews Quarry (old Hale Quarry; Grandfather Andrews Quarry), Portland, Middlesex Co., Connecticut, USA
13.0km (8.1 miles) Gillette Quarry (J-J Mine; Haddam Neck Quarry), Haddam Neck, Haddam, Middlesex Co., Connecticut, USA
41.3km (25.6 miles) Thomaston Dam railroad cut, Thomaston Dam, Thomaston, Litchfield Co., Connecticut, USA
69.7km (43.3 miles) Diamond Hill (Ashaway Village), Ashaway, Hopkinton, Washington Co., Rhode Island, USA
71.5km (44.4 miles) Blandford mica mines, Blandford, Hampden Co., Massachusetts, USA
71.9km (44.7 miles) Kent Iron Mine (Limonite mine), Kent, Litchfield Co., Connecticut, USA
77.5km (48.1 miles) Loudville Lead Mines (Manhan Lead-Silver Mine; Southampton Lead Mine; Northampton Lead Mine), Easthampton, Hampshire Co., Massachusetts, USA
79.3km (49.3 miles) Fillow Quarry (Branchville Quarry; Branchville Mica Mine; Smith Mine), Branchville, Redding (Reading), Fairfield County, Connecticut, USA
 
Mineral and/or Locality  
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