From the Ural Mountains of Russia, this choice, matrix, copper features a large spinel twin, 3.5 cm in length. The natural brown patina is really special, and clearly shows it hasn't been acid-cleaned. The main crystal is huge for the locale, to be on matrix! The spinel twin crystal, so dominant, highlights the specimen - but the smaller crystals are nice, too. This is clearly an old piece from a venerable old Russian copper mining location, and I am told that it was likely mined in the mid to late 1800s. It is one of the best I have seen for the locality for sale in that I have seen several loose crystals over the years, but no such large and sharp crystal ON MATRIX as we have here.