This is rough Rainbow Cal-silica that comes out of Mexico. It has lots of bands of color and it takes a great polish! This material may be man made.
Rainbow cal silica rough first captures the attention with its raw, unpolished look, displaying an enthralling range of hues evocative of a glittering rainbow. Radiant reds, vibrant oranges, brilliant yellows, lush greens, and deep blues are all included in this spectrum, with sporadic bursts of magenta and purple. Veins, swirls, and pockets of silica deposits embedded in the rough material give the composition more depth and character.
When expert lapidaries strive to uncover rainbow cal silica rough's hidden riches, the material's real beauty becomes apparent. The rough material is turned into beautiful cabochons, beads, and other lapidary creations by cutting, sculpting, and polishing; each is a distinct representation of the stone's natural beauty.