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Feldspar Group from selected localities.

USA
 
  • Connecticut
    • Middlesex Co.
      • East Hampton (Chatham)
[var: Perthite] USGS Prof Paper 255
[var: Perthite] USGS Prof Paper 255
[var: Perthite] Cameron, Eugene N., David M. Larrabee, Andrew H. McNair, James T. Page, Glenn W. Stewart, and Vincent E. Shainin. (1954): Pegmatite Investigations 1942-45 New England. USGS Professional Paper 255.
      • Portland
[var: Perthite] 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.
 
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