RARE Shattuckite Freeform Rounded Potato Nuggets, 8 inch strand.  This Shattuckite comes from Namibia.  These nuggets measure approx. 8-10mm diameter by 10-12mm in length.

Shattuckite is a relatively rare copper silicate mineral. It was first discovered in 1915 in the copper mines of Bisbee, Arizona, specifically the Shattuck Mine (hence the name). It is a secondary mineral that forms from the alteration of other secondary minerals. At the Shattuck Mine, it forms pseudomorphs after malachite. A pseudomorph is an atom by atom replacement of a crystal structure by another crystal structure, but with little alteration of the outward shape of the original crystal. It is sometimes used as a gemstone.  https://en.wikipedia.org/wiki/Shattuckite