Onyx – Natural, Other, White

If onyx is a variety of agate, then this specimen certainly qualifies. The striking black-and-white bullseye-like layer of chalcedony actually grew on a matrix of terminated crystalline quartz. 7.0 x 5.8 x 5.5 cm, Minas Gerais, Southeast Region, Brazil. © Rob Lavinsky, www.iRocks.com. Used with permission.

Article: Onyx Properties, Varieties, and Jewelry Information

Credit: www.iRocks.com