This copper exhibits spinel twinning as the dominant form and "anchor" for a wildly fantasmagorical spongy crystal growth shooting off that main stalk. The juxtaposition of the two crystal forms, so wildly differing, on the same piece, is really quite interesting. It is just plain weird, and much better in person. I especially like the deep green patina which is unusually dark in green tones. 7.6 x 4.1 x 0.9 cm