This strand of dyed Magnesite Cubes will repeat its bright eight colors (purple, pink, green, orange, turquoise, yellow, red, and white) along its 15-inch length. Look closely and you'll make out the faint black matrix that is characteristic for magnesite. Magnesite is comprised of magnesium carbonate and while brittle in its natural state, it is reinforced to make it quite durable before being shaped in beads for jewelry use.