Plagioclase from selected localities.
USA | |
| U.S Bureau of Mines, Sep, 1995 |
U.S Bureau of Mines, Sep, 1995; U.S. Geological Survey Professional Paper 248 | |
U.S Bureau of Mines, Sep, 1995 |
USA | |
| U.S Bureau of Mines, Sep, 1995 |
U.S Bureau of Mines, Sep, 1995; U.S. Geological Survey Professional Paper 248 | |
U.S Bureau of Mines, Sep, 1995 |