Feldspar Group from selected localities.
USA | |
| Heinrich, E.WM.,and Olson, Jerry C.,(1953) Mica Deposits of the Southeastern Piedmont, Part 11 :USGS Professional Paper 248-G |
| [var: Perthite] Heinrich, E.WM.,and Olson, Jerry C.,(1953) Mica Deposits of the Southeastern Piedmont, Part 11 :USGS Professional Paper 248-G |