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A cube of Galena that has been modified by the octahedral crystal form.  Specifically, the corners of the cube have been truncated by the octahedral form.

galenacl1555.jpg (156700 bytes) Galena has very good cubic cleavage (cleavage in three directions at right angles).  In fact it is difficult to get the Galena to break in any other manner.

galenahillocks1.jpg (1313151 bytes) Growth Hillocks