Malachite obelisks, pair. The malachite for this set of obelisks was sourced from the Congo, where the finest quality of this mineral is currently found. Malachite from the 18th and 19th century was also sourced from Russia. Obelisks were always an important object brought back by travelers on the Grand Tour in Italy. After the discovery of the Egyptian tombs, they became even more in vogue and have remained so since.