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Perthite from
Case Quarries, Portland, Middlesex Co., Connecticut, USA

Species:Feldspar Group var: Perthite
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 Methods:Visually Identified
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.
Mineral Data:Click here to view Perthite data
Locality Data:Click here to view Case Quarries, Portland, Middlesex Co., Connecticut, USA
Nearest other occurrences of Perthite
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
39.3km (24.4 miles) F Knapp Prospect, Canton, Hartford Co., Connecticut, USA
53.3km (33.1 miles) G 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) H West Kingston, South Kingstown, Washington Co., Rhode Island, USA
89.7km (55.8 miles) I Smithfield beryl prospect, Smithfield, Providence Co., Rhode Island, USA
105.0km (65.2 miles) J Milford, Worcester Co., Massachusetts, USA
105.4km (65.5 miles) K Grants Mills, Cumberland, Providence Co., Rhode Island, USA
110.2km (68.5 miles) L Bristol Ferry, Bristol, Bristol Co., Rhode Island, USA
120.5km (74.9 miles) M Beattie & Wilcox Quarry, Fall River, Bristol Co., Massachusetts, USA
121.4km (75.4 miles) N Royalston, Worcester Co., Massachusetts, USA
123.6km (76.8 miles) O Rollstone Hill Quarry, Fitchburg, Worcester Co., Massachusetts, USA
130.1km (80.8 miles) P Rattlesnake Hill, Sharon, Norfolk Co., Massachusetts, USA
139.8km (86.9 miles) Q Fort Point, Fairhaven, Bristol Co., Massachusetts, USA
163.0km (101.3 miles) R Kallenberg Quarry (Robin Rock Quarry), Lynnfield, Essex Co., Massachusetts, USA
163.2km (101.4 miles) S Blister Mine, Alstead, Cheshire Co., New Hampshire, USA
167.2km (103.9 miles) T Davidson Farm pegmatite, Alstead, Cheshire Co., New Hampshire, USA
170.4km (105.9 miles) U Alstead, Cheshire Co., New Hampshire, USA
170.8km (106.1 miles) V Salem, Essex Co., Massachusetts, USA
175.4km (109.0 miles) W Coney Island, Salem, Essex Co., Massachusetts, USA
178.6km (111.0 miles) X Acworth, Sullivan Co., New Hampshire, USA
192.7km (119.8 miles) Y Gloucester, Essex Co., Massachusetts, USA
194.6km (120.9 miles) Z George Frank Smith Quarry (G. F. Smith Quarry), Newport, Sullivan Co., New Hampshire, USA
202.5km (125.9 miles) 0 Ascutney Mountain complex, Windsor Co., Vermont, USA
208.6km (129.6 miles) 1 Cuttingsville, Shrewsbury, Rutland Co., Vermont, USA
223.8km (139.1 miles) 2 Ruggles Mine, Grafton, Grafton Co., New Hampshire, USA
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