Biotite from selected localities.
USA | |
| MRDS database Dep. ID #10048342, MRDS ID #M899929. |
Singer, D.A., Berger, V.I., and Moring, B.C. (2008): US Geological Survey Open-File Report 2008-1155. | |
| rolf luetcke |
| Singer, D.A., Berger, V.I., and Moring, B.C. (2005): USGS Open-File Report 05-1060 |