Physical Property · Reviewed definition

Cleavage

A mineral’s tendency to split along particular crystallographic planes where bonding is comparatively weak.[1]

Plain English

What it means

Cleavage is directional and reflects crystal structure.

Why it matters

It affects cutting, setting, repair, and impact risk.

What it does not tell you

Cleavage quality and direction vary among minerals.

Evidence

References

  1. 1
    More than the Mohs Scale: Gem Durability

    Gemological Institute of America

    Open source