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Feldspar Group from
Case Quarries, Portland, Middlesex Co., Connecticut, USA

Classification
Species:'Feldspar Group' (not an IMA approved species)
Comments:aka - microcline. A major rock-forming component of the pegmatites, the largest and best crystals terminate in the quartz cores and can reach over 20 cm.
Habit:anhedral to subhedral blocky
Colour:white, tan, pale pink
Quality for species:Rock forming mineral/non-crystalline/little interest for collectors.(##)
Abundance at site:Extremely common
Confirmation
Validity:Confirmed
Confirmation Methods:Visually Identified
References
References: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.
Data
Mineral Data:Click here to view Feldspar Group data
Locality Data:Click here to view Case Quarries, Portland, Middlesex Co., Connecticut, USA
Nearest other occurrences of Feldspar Group
4.6km (2.9 miles) A State Forest Quarry No. 1 (State Forest #1 Quarry; Clark Hill Quarry), East Hampton (Chatham), Middlesex Co., Connecticut, USA
7.8km (4.8 miles) B Riverside Quarry (Western Quarry), White Rock District (White Rocks District), Middletown, Middlesex Co., Connecticut, USA
10.2km (6.3 miles) C Blumenthal prospect, Glastonbury, Hartford Co., Connecticut, USA
13.1km (8.1 miles) D Anderson No. 2 Mica Mine, East Hampton (Chatham), Middlesex Co., Connecticut, USA
13.1km (8.2 miles) E Bailey prospect, East Hampton (Chatham), Middlesex Co., Connecticut, USA
29.4km (18.3 miles) F Salem, New London Co., Connecticut, USA
43.7km (27.2 miles) G Barkhamsted, Litchfield Co., Connecticut, USA
53.3km (33.1 miles) H Curtis Quarry (Southford Quarry; Southford pegmatite; Southbury rose quartz quarry; Bridgeport Woodfinishing Co. Quarry; Hulls Hill), Southford, Southbury, New Haven Co., Connecticut, USA
87.0km (54.1 miles) I West Kingston, South Kingstown, Washington Co., Rhode Island, USA
89.7km (55.8 miles) J Smithfield beryl prospect, Smithfield, Providence Co., Rhode Island, USA
97.8km (60.8 miles) K Quabbin Aqueduct Shaft #6 locality, Rutland, Worcester Co., Massachusetts, USA
99.7km (62.0 miles) L Hobby Quarry (Buresch Quarry), North Castle, Westchester Co., New York, USA
101.0km (62.8 miles) M Consolidated Feldspar Mining Corporation's plant (Baylis prospect (property) & Speranza prospect (property)), Bedford, Westchester Co., New York, USA
101.9km (63.3 miles) N Quabbin Aqueduct Shaft #4 locality, Rutland, Worcester Co., Massachusetts, USA
105.0km (65.2 miles) O Milford, Worcester Co., Massachusetts, USA
105.4km (65.5 miles) P Grants Mills, Cumberland, Providence Co., Rhode Island, USA
110.2km (68.5 miles) Q Bristol Ferry, Bristol, Bristol Co., Rhode Island, USA
111.6km (69.4 miles) R Chappaqua, New Castle, Westchester Co., New York, USA
111.6km (69.4 miles) S Croft Mine, Oscawana Corners, Town of Putnam Valley, Putnam Co., New York, USA
117.0km (72.7 miles) T Mount Taurus quarry (Mt Taurus quarry; Bull Hill quarry; Verplanck quarry), Cold Spring, Town of Philipstown, Putnam Co., New York, USA
117.1km (72.8 miles) U Valhalla, Mount Pleasant, Westchester Co., New York, USA
117.5km (73.0 miles) V West Point, Orange Co., New York, USA
119.3km (74.2 miles) W Sparta Mine, Ossining (Sing Sing), Westchester Co., New York, USA
119.9km (74.5 miles) X Harrison, Westchester Co., New York, USA
120.5km (74.9 miles) Y Beattie & Wilcox Quarry, Fall River, Bristol Co., Massachusetts, USA
121.4km (75.4 miles) Z Royalston, Worcester Co., Massachusetts, USA
121.9km (75.7 miles) 0 Forest of Dean Mine, Fort Montgomery, Town of Highlands, Orange Co., New York, USA
123.6km (76.8 miles) 1 Rollstone Hill Quarry, Fitchburg, Worcester Co., Massachusetts, USA
125.0km (77.6 miles) 2 Larchmont, Mamaroneck, Westchester Co., New York, USA
126.8km (78.8 miles) 3 Beechy Bottom Mine, Bear Mountain State Park, Rockland Co., New York, USA
130.1km (80.8 miles) 4 Rattlesnake Hill, Sharon, Norfolk Co., Massachusetts, USA
131.2km (81.5 miles) 5 Central Valley, Town of Woodbury, Orange Co., New York, USA
138.6km (86.1 miles) 6 Kingsbridge Road quarries, Manhattan (New York Co.), New York City, New York, USA
139.8km (86.9 miles) 7 Fort Point, Fairhaven, Bristol Co., Massachusetts, USA
139.9km (86.9 miles) 8 Jaffrey, Cheshire Co., New Hampshire, USA
144.5km (89.8 miles) 9 Augusta Mine, Southfields, Town of Tuxedo, Orange Co., New York, USA
Mineral and/or Locality  
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