A silica rich orbicular rhyolite with phenomenal orbs and patterns which will cut large and small cabochons. The material is also called Mushroom picture jasper. The mushroom picture rock is cabbing grade, but may have a few pits and vugs. The unusual gemstone material will polish well, especially with diamond procedures. The colors found in mushroom picture rock are reds, tans, browns, beige, orange, grays and greens.