Flexible - Minerals that are capable of being bent without breaking are said to be flexible. If a flexible mineral will return to its original position after stress is released, it is said to be flexible and elastic. If it does not return to its original position, but retains the position it was given after being bent, it is said to be flexible but inelastic. If just the term flexible is used, it usually refers to flexible but inelastic. Flexible minerals are many times capable of be molded, shaped or stretched. Flexibility is a form of tenacity.