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<TR><TD><A HREF="tonalite.html"><IMG BORDER="1" SRC="tonalite.gif" ALT="Tonalite"></A></TD><TD><A HREF="tonalite.html">Tonalite</A>  - a quartz-diorite containing biotite and hornblende in nearly equal proportions</TD></TR>
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<P><A HREF="/rocks-minerals-pictures/">Earth's Core</A> - Rare rocks offer a unique glimpse of its composition</P>
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