Opal from selected localities.
USA | |
| [Opal-A var: Opal-AN] Smithsonian Institution Mineral Reference Collection No.C5279-02 |
| [Opal-A var: Opal-AN] Ross,Clarence S.,(1937) Sphalerite from a Pegmatite near Spruce Pine,North Carolina:The American Mineralogist,May,1937 |