n. semi-precious stone with alternating layers of color (black and white variety is often used to make cameo brooches); milky quartz with bands of color
n. onyx, semi-precious stone with alternate colored layers; colorful quartz
(m) n. onyx, semi-precious stone with alternating layers of color (black and white variety is often used to make cameo brooches); milky quartz with bands of color
n. semi-precious stone with alternating layers of color (black and white variety is often used to make cameo brooches); milky quartz with bands of color