Biotite from Harz Mountains, Germany
Germany | |
| Williams, Howel, Turner, Francis J., Gilbert, Charles M. (1954) Petrography - An Introduction to the Study of Rocks in Thin Sections. W. H. Freeman and Company, San Francisco, CA. |
| Schnorrer-Köhler, G. (1988) Mineralogische Notizen IV. Der Aufschluss, 39, 153-168. |
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Kaltes valley, Bad Harzburg, Goslar District, Lower Saxony, Germany