Tenacity is a measure of how resistive a mineral is to breaking, bending, or being crushed. When you exceed that limit, fracture is how the mineral breaks once the tenacity (or tenacious) limit has been exceeded.
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“fracture is how the mineral creaks once the tenacity (or tenacious) limit has been exceeded”
Did you mean “fracture is how the mineral *breaks* once the tenacity (or tenacious) limit has been exceeded”?