Ouro Preto, Iron Quadrangle, Minas Gerais, Brazil
A facet grade euhedral imperial orange topaz is intact on a brown, decomposed matrix. This is a very rare piece of Ouro Preto topaz that has remained with its matrix. Because this locality is a very degraded and weathered site, crystals are found not in rock but in a sticky almost clay type material. It is very rare for these imperial topaz crystals to be doubly terminated or to be found on matrix. The nature of the formation is even debated (degraded pegmatite? hydrothermal formation?) due to a lack of original strata or rock. This piece also has a high luster and perfect termination.
Ex James Zigras
3.50 x 4.20 x 2.60 cm