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

Mineral Species
Species:Feldspar Group var: Perthite
Description
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 of samples:Rock forming mineral/non-crystalline/little interest for collectors.(##)
Rarity 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 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
53.3km (33.1 miles) F 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) G West Kingston, South Kingstown, Washington Co., Rhode Island, USA
89.7km (55.8 miles) H Smithfield beryl prospect, Smithfield, Providence Co., Rhode Island, USA
105.0km (65.2 miles) I Milford, Worcester Co., Massachusetts, USA
105.4km (65.5 miles) J Grants Mills, Cumberland, Providence Co., Rhode Island, USA
110.2km (68.5 miles) K Bristol Ferry, Bristol, Bristol Co., Rhode Island, USA
120.5km (74.9 miles) L Beattie & Wilcox Quarry, Fall River, Bristol Co., Massachusetts, USA
121.4km (75.4 miles) M Royalston, Worcester Co., Massachusetts, USA
123.6km (76.8 miles) N Rollstone Hill Quarry, Fitchburg, Worcester Co., Massachusetts, USA
130.1km (80.8 miles) O Rattlesnake Hill, Sharon, Norfolk Co., Massachusetts, USA
139.8km (86.9 miles) P Fort Point, Fairhaven, Bristol Co., Massachusetts, USA
163.0km (101.3 miles) Q Kallenberg Quarry (Robin Rock Quarry), Lynnfield, Essex Co., Massachusetts, USA
163.2km (101.4 miles) R Blister Mine, Alstead, Cheshire Co., New Hampshire, USA
167.2km (103.9 miles) S Davidson Farm pegmatite, Alstead, Cheshire Co., New Hampshire, USA
170.4km (105.9 miles) T Alstead, Cheshire Co., New Hampshire, USA
170.8km (106.1 miles) U Salem, Essex Co., Massachusetts, USA
175.4km (109.0 miles) V Coney Island, Salem, Essex Co., Massachusetts, USA
178.6km (111.0 miles) W Acworth, Sullivan Co., New Hampshire, USA
192.7km (119.8 miles) X Gloucester, Essex Co., Massachusetts, USA
194.6km (120.9 miles) Y George Frank Smith Quarry (G. F. Smith Quarry), Newport, Sullivan Co., New Hampshire, USA
202.5km (125.9 miles) Z Ascutney Mountain complex, Windsor Co., Vermont, USA
208.6km (129.6 miles) 0 Cuttingsville, Shrewsbury, Rutland Co., Vermont, USA
223.8km (139.1 miles) 1 Ruggles Mine, Grafton, Grafton Co., New Hampshire, USA
Mineral and/or Locality  
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