In mineralogy, tenacity is a mineral's behavior when deformed or broken.
Common terms[1]
Brittleness:
The mineral breaks or powders easily. Most ionic-bonded minerals are brittle.
Malleability:
The mineral may be pounded out into thin sheets. Metallic-bonded minerals are usually malleable.
Ductility:
The mineral may be drawn into a wire. Ductile materials have to be malleable as well as tough.
Sectility:
May be cut smoothly with a knife. Relatively few minerals are sectile. Sectility is a form of tenacity and can be used to distinguish minerals of similar appearance.[2] Gold, for example, is sectile but pyrite ("fool's gold") is not.
Elasticity:
If bent, will spring back to its original position when the stress is released.
Plasticity:
If bent, will not spring back to its original position when the stress is released. It stays bent. In contrast, flexibility is the ability of a material to deform elastically and return to its original shape when the applied stress is removed.
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