Orthoclase from Indiana, USA
USA | |
| Erd, Richard C., Greenberg, Seymour S. (1960) Minerals of Indiana. Bulletin 18. Indiana Geological Survey |
| Byron F. King (1932) American Mineralogist, 17, #10, 485-490. |
USA | |
| Erd, Richard C., Greenberg, Seymour S. (1960) Minerals of Indiana. Bulletin 18. Indiana Geological Survey |
| Byron F. King (1932) American Mineralogist, 17, #10, 485-490. |