195 CTS-MEXICAN LEOPARD ROUGH DT-946

 LEOPARD OPAL

MEXICAN OPAL

ROUGH

 RED BLUE  GREEN WHITE COLoR

SLICED READY TO SHAPE-POLISH

This is  a natural untreated opal from Mexico.Also known as  opal from the lost mines of the Aztecs.Ideal for cabbing or carving.We have included both sides of the stone plus a hand shot.You have the option to cut the stone natural or some cutters like to fill the small cavities with resin or super glue.

The GIA have published this about this type fo opal- “Leopard opal” consists of vesicular basalt impregnated with play-of-color opal, and is known only from Zimapán, Hidalgo State, Mexico. The formation of this ornamental stone was made possible by an abundance of silica derived from the chemical breakdown of overlying volcanic ash layers, the permeability of the underlying basalt, and the presence of pores in the basalt of an aesthetically pleasing size. The even distribution and small size of the opal-filled vesicles makes the rock attractive when cut or carved and polished. Veinlets and irregular masses of play-of-color opal showing various bodycolors (red, white, and colorless to pale blue) have also been deposited along joints and fractures within the basalt flow. This opal deposit, which may have been worked in pre-Columbian times, has been explored only by a number of small test pits in recent years, and significant potential remains for its future development.